期刊：
PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2023年25(11):7662-7668 ISSN：1463-9076
通讯作者：
Chen, Zhaoyong
作者机构：
[Yuan, Mengming; Zhu, Huali; Chen, Zhaoyong; Zeng, Guang; Tang, Zhuolin] Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410114, Hunan, Peoples R China.;[Zhu, Huali; Chen, Zhaoyong; Zeng, Guang] Changsha Univ Sci & Technol, Inst New Energy & Power Battery, Changsha 410114, Hunan, Peoples R China.
通讯机构：
[Guang Zeng] S;School of Materials Science and Engineering, Changsha University of Science and Technology, Changsha, Hunan 410114, China<&wdkj&>Institute of New Energy and Power Battery, Changsha University of Science and Technology, Changsha, Hunan 410114, China
摘要：
As an emerging green energy storage and conversion system, rechargeable Li-CO(2) batteries have undergone extensive research due to their ultra-high energy density and their significant role in greenhouse gas CO(2) conversion. However, current Li-CO(2) batteries have some shortcomings that severely limit their large-scale application. The most critical problems involve the insulation of the discharge product Li(2)CO(3) and the slow decomposition kinetics, meaning that the battery generates a large overpotential and has a low cycle life, so the rational design of an efficient cathode catalyst is imperative. Here, we prepared a composite material via the magnetron sputtering of Pt onto nitrogen-doped polypyrrole carbon nanotubes (NPPy-CNTs) as a high-efficiency cathode catalyst for Li-CO(2) batteries. The three-dimensional hollow tubular NPPy-CNTs can provide efficient channels for CO(2) diffusion and enough space for the uniform deposition and decomposition of Li(2)CO(3). Benefiting from the doping of nitrogen, more defects and active sites are introduced into the polypyrrole carbon nanotubes. Furthermore, the introduction of a small amount of the precious metal Pt effectively improves the catalytic activity of the CO(2) reduction reaction (CO(2)RR) and the CO(2) release reaction (CO(2)ER), greatly improving the cycle life of the battery. The Pt-NPPy-CNT-based battery shows a much improved electrochemical performance. The overpotential of the battery is reduced to 0.75 V, and the battery shows a specific discharge capacity of up to 29 614 mA h g(-1).
关键词：
FeOOH/Zn(OH)2/CoS ferromagnetic nanocomposites;electrochemical performances;magnetic field;stern double layer model
摘要：
In the study, the enhanced electrochemical mechanism of FeOOH/ Zn(OH)2/CoS ferromagnetic nanocomposite in magnetic field is proposed by combining the Stern double layer model with zeta potentials. The promotion of electrolyte ions transfer by the additional magnetic field generated after FZC magnetisation, the change in Warburg impedance and the magnetohydrodynamics effect for the electrochemical performances of FZC nanocomposites are investigated, systematically. Abstract The FeOOH/Zn(OH)2/CoS (FZC) nanocomposites are synthesized and show the outstanding electrochemical properties in both supercapacitor and catalytic hydrogen production. The specific area capacitance reaches 17.04 F cm−2, which is more than ten times higher than that of FeOOH/Zn(OH)2 (FZ) substrate: 1.58 F cm−2). FZC nanocomposites also exhibit the excellent cycling stability with an initial capacity retention rate of 93.6% after 10 000 long‐term cycles. The electrolytic cell (FZC//FZC) assembled with FZC as both anode and cathode in the UOR (urea oxidation reaction)|| HER (hydrogen evolution reaction) coupled system requires a cell voltage of only 1.453 V to drive a current density of 10 mA cm−2. Especially, the electrochemical performances of FZC nanocomposites are enhanced in magnetic field, and the mechanism is proposed based on Stern double layer model at electrode–electrolyte interface (EEI). More electrolyte ions reach the surface of FZC electrode material under Kelvin force, moreover, the warburg impedance of FZC nanocomposites decrease under magnetic field action, which results in the enhanced behaviors for both the energy storage and urea oxidation reaction .
摘要：
In this paper, graphene with low platinum loading was prepared using the thermal expansion method, resulting in uniform dispersion of ultrafine Pt nanoparticles. The synthesized Pt/graphene exhibits a large specific surface area, abundant graphene defects, and homogeneous Pt particles. In 0.1 M KOH, the catalyst exhibits a half-wave potential of 0.84 V (vs. RHE), a limiting current density of 5.66 mA cm-2, and an electron transfer number of 3.9. The performance is close to that of the commercial 20 wt% Pt/C and outperforms the 10 wt% Pt/C. Moreover, it demonstrates better charge transfer kinetics and exceptional stability compared to the commercial 20 wt% Pt/C. This provides a promising avenue for the development of novel Pt-based catalysts.
摘要：
Styrene/1,3-diene copolymers are widely used in rubber tires, adhesives, waterproof materials, automotive parts and others. However, their oil resistance, compatibility with polar materials, and poor adhesion limit their applications. Polarization modification strategy can further expand the application field of such materials. In this paper, a series of strictly alternating copolymers were synthesized in cyclohexane via living and controlled anionic alternating copolymerization of styrene derivatives (including styrene (ST), p-methylstyrene (MST), p-tert-butylstyrene (TBS), and 1,1-diphenylethylene (DPE)) with 1,3-pentadiene (PD) using n-BuLi initiator. The above-mentioned alternating copolymers were epoxidized in cycloamyl methyl ether (CPME, green solvent) using m-Chloroperoxybenzoic acid (m-CPBA) as the oxygen source. The H-1 NMR and FTIR results showed that the degree of epoxidation (DE) of the alternating copolymers was controllable and the cross-linking gels can be avoided (determined by solubility experiment), and the DE of nearly 100% could be achieved by optimizing processes. As for these PD-based alternating copolymers, the type of substituents on rigid benzene rings has a certain impact on the epoxidation rate as well as the DE. DSC results showed that not only the high steric hindrance groups in polymer side chains but also the epoxidation strategy can greatly improve the heat resistance of the product.
通讯机构：
[Lu, ZP ; Wu, Y] U;[Lei, ZF ] H;Univ Sci & Technol Beijing, Beijing Adv Innovat Ctr Mat Genome Engn, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China.;Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Peoples R China.
摘要：
Oxygen solute strengthening is an effective strategy to harden alloys, yet, it often deteriorates the ductility. Ordered oxygen complexes (OOCs), a state between random interstitials and oxides, can simultaneously enhance strength and ductility in high-entropy alloys. However, whether this particular strengthening mechanism holds in other alloys and how these OOCs are tailored remain unclear. Herein, we demonstrate that OOCs can be obtained in bcc (body-centered-cubic) Ti-Zr-Nb medium-entropy alloys via adjusting the content of Nb and oxygen. Decreasing the phase stability enhances the degree of (Ti, Zr)-rich chemical short-range orderings, and then favors formation of OOCs after doping oxygen. Moreover, the number density of OOCs increases with oxygen contents in a given alloy, but adding excessive oxygen (>3.0 at.%) causes grain boundary segregation. Consequently, the tensile yield strength is enhanced by ~75% and ductility is substantially improved by ~164% with addition of 3.0 at.% O in the Ti-30Zr-14Nb MEA. Ordered oxygen complexes (OOCs) endow a unique interstitial strengthening mechanism for simultaneously enhancing strength and ductility in HEAs. Here, the authors demonstrate whether such mechanism can be extended to other alloy systems and how the formation of OOCs is tailored.
通讯机构：
[Qin, Wei] C;College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha 410114, China. Electronic address:
摘要：
Due to the large ionic radius and associated slow reaction kinetics of potassium ions, it is a major chal-lenge to find suitable anode materials for potassium-ion batteries. Herein, we design porous antimony -based nanofibres via a simple, low-cost and large scalable method to promote the electrochemical per-formance of potassium-ion batteries. Unlike those traditionally treated in inert atmospheres, using the different decomposition processes of polyacrylonitrile and polyvinylpyrrolidone in air, we obtain anti-mony trioxide embedded in porous carbon nanofibres (Sb2O3@PCN). The porous structure can promote the permeation of electrolyte into electrode materials and increase the active sites of the redox reaction. The porous carbonaceous fibre skeleton structure establishes a fast ion transport channel and enhances the kinetic performance. In a concentrated 5 M potassium bis(fluorosulfonyl)-imide/dimethyl carbonate electrolyte, Sb2O3@PCN exhibits a stable discharge specific capacity of 437.3 mAh g-1 at a current density of 100 mA g-1 after 50 cycles, which is much higher than that treated in a N2 atmosphere (247.5 mAh g-1). This method provides a new approach for the preparation of efficient potassium-ion battery electrode materials. (c) 2022 Elsevier Inc. All rights reserved.
摘要：
Layered Ni-rich transition metal oxides (LiNixCoyMnzO2, x + y + z = 1, NCM) are regarded as promising cathodes for high-energy Li-ion batteries, due to merits of large capacity and low cost. However, the formed microcracks during cycling can lead to severe structural degradation, rapidly deteriorating properties of NCM cathode. To solve this problem, an enhanced mechanical strength strategy triggered by regulating the grain size of precursor has been successfully proposed, which is aimed at improving the structural stability of NCM cathode. It is found that NCM cathode featured with small grain size (NCM-S) exhibits a strong mechanical property for hindering structural deterioration. Detailedly, the strong external compression rupture strength triggered by grain size effect and decreased internal stress originating from mitigated H2-H3 phase transition are both beneficial for synergistically suppressing the generation of microcracks. Benefiting from the unique architecture, the NCM-S cathode delivers a remarkable initial discharge capacity of 192.6 mAh g(-1) at 0.1C and excellent capacity retention of 82.8 % after 300 cycles at 1C. This work powerfully provides a mechanistic perspective based on the regulating precursor grain size for impeding the structure collapse, which is beneficial for purposefully engineering the high-performance Ni-rich cathodes in electric vehicles.
期刊：
Journal of Materials Chemistry A,2023年11(27):14720-14727 ISSN：2050-7488
通讯作者：
Yuan, D;Zhang, YZ;Zhang, HT
作者机构：
[Yao, Hong; Yuan, D; Li, Yuhang; Yuan, Du; Liu, Xiangjie; Li, Xin] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Wong, Ming Wah; Chen, Yingqian] Natl Univ Singapore, Dept Chem, Block S8,3 Sci Dr 3, Singapore 117543, Singapore.;[Zhang, Yizhou; Zhang, YZ] Nanjing Univ Informat Sci & Technol, Inst Adv Mat & Flexible Elect IAMFE, Sch Chem & Mat Sci, Nanjing 210044, Peoples R China.;[Zhang, Haitao] Chinese Acad Sci, Inst Proc Engn, Beijing 100190, Peoples R China.
通讯机构：
[Zhang, YZ ] N;[Yuan, D ; Zhang, HT ] C;Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;Nanjing Univ Informat Sci & Technol, Inst Adv Mat & Flexible Elect IAMFE, Sch Chem & Mat Sci, Nanjing 210044, Peoples R China.;Chinese Acad Sci, Inst Proc Engn, Beijing 100190, Peoples R China.
摘要：
Electrolyte design provides a fundamental solution to address the irreversibility and instability of metallic Zn anodes for the fast-developing zinc-ion batteries, considering the increasing issue of their sustainability. Herein, a cellulose-complexing approach was developed for a ZnCl2-based eutectic electrolyte to reconstruct Zn2+ coordination, tune water activity and regulate the solid-electrolyte interface (SEI). In the case of deficient water, the oxygen atoms from the glucose unit were revealed to coordinate directly with Zn2+, resulting in the participation of cellulose in the solvation shell of Zn2+, with a change in the hydrogen-bond network, where water transformed into the bulk state. The reshaped Zn2+ coordination with sluggish water activity led to a widened electrochemical window and promising ion transport in the complex electrolyte. Endowed with a dissolution-regeneration induced in situ SEI with inorganic-organic characteristics, dendrite-free Zn stripping/plating were achieved at a high current density of 50 mA cm(-2) and 50 mA h cm(-2) for 2000 h, with a high depth-of-discharge of 85%. The complex electrolyte was demonstrated to be beneficial for the long-term cycling stability of the activated carbon/Zn cell compared to its ZnCl2 eutectic electrolyte counterpart. Further, an artificial SEI was fabricated via electrochemical deposition using the electrolyte, possessing the merits of organic-dominant characteristics. The developed approach provides a facile route to prepare novel zinc electrolytes towards a high utilization rate of Zn.
期刊：
PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2023年25(22):15271-15278 ISSN：1463-9076
通讯作者：
Wang, Yanxia;Chen, ZY
作者机构：
[Wang, Yanxia; Tang, Yu; Li, Tao; Chen, Zhaoyong; Wen, Junhao; Li, Zihua; Lin, Feng] Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410114, Peoples R China.;[Wang, Yanxia; Zhu, Huali; Chen, Zhaoyong] Changsha Univ Sci & Technol, Inst New Energy & Power Battery, Changsha 410114, Hunan, Peoples R China.;[Zhu, Huali] Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410114, Peoples R China.
通讯机构：
[Wang, YX; Chen, ZY ] C;Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410114, Peoples R China.;Changsha Univ Sci & Technol, Inst New Energy & Power Battery, Changsha 410114, Hunan, Peoples R China.
摘要：
Li-rich Mn-based layered materials are considered the most promising next-generation high-energy-density cathode materials due to their high capacity, but their large irreversible capacity loss and severe voltage attenuation hinder their practical application. The limited operating voltage also makes it difficult to satisfy the increasing demand of high energy density in future applications. Inspired by the high voltage platform of Ni-rich LiNi(0.8)Co(0.1)Mn(0.1)O(2), we design and prepare a Li(1.2)Ni(0.32)Co(0.04)Mn(0.44)O(2) (LLMO811) cathode material with increased Ni content via the acrylic acid polymerization method and regulate the amounts of excess lithium of LLMO. It is found that LLMO-L3 with 3% excess lithium has the highest initial discharge capacity of 250 mA h g(-1) with a coulombic efficiency of 83.8%. Taking advantage of a high operating voltage of about 3.75 V, the material achieves an impressive high energy density of 947 W h kg(-1). Moreover, the capacity at 1C reaches 193.2 mA h g(-1), which is higher than that of ordinary LLMO811. This large capacity is attributed to the highly reversible O redox reaction, and the strategy used to achieve this would throw some light on the exploration of high-energy-density cathodes.
期刊：
Journal of Alloys and Compounds,2023年939:168722 ISSN：0925-8388
通讯作者：
Chao Chen<&wdkj&>Xiaochun Liu
作者机构：
[Li, Dan; Geng, Zhaowen; Chen, Chao; Zhang, Jiaqi; Zhou, Kechao; Wu, Yiyou] Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China.;[Liu, Xiaochun] Changsha Univ Sci & Technol, Inst Met, Coll Mat Sci & Engn, Changsha 410004, Peoples R China.;[Liu, Yang] Hunan Univ Sci & Technol, Hunan Engn Res Ctr Forming Technol & Damage Resist, Xiangtan 411201, Peoples R China.
通讯机构：
[Chao Chen] S;[Xiaochun Liu] I;State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China<&wdkj&>Institute of Metals, College of Materials Science and Engineering, Changsha University of Science & Technology, Changsha 410004, China
摘要：
In this study, the intrinsic heterogeneous grain structure derived from the special temperature gradient in additive manufacturing and the intragranular precipitation were utilized for constructing a high-strength Al-Mg-Sc-Zr alloy. The alternative distribution of the coarse-grained (CG) layer in the middle of the molten pool and ultrafine-grained (UFG) layer at the boundary between the adjacent two molten pools were produced by using laser powder bed fusion (L-PBF) technology. High contents of Sc and Zr elements were introduced into the Al-Mg alloy, which contributed to the stabilization of UFG boundaries in the form of sub-micro primary Al3(Sc, Zr) particles and resulted in the formation of supersaturated Sc and Zr solid solutions in CG. The afterward aging treatment or well-controlled hot isostatic pressing (HIP) induced uniform precipitation of the high-density nano-scale coherent Al3(Sc, Zr) phase in CG. The HIP also promoted a significant decrease in porosity of the alloy and resulted in a combination of high ultimate tensile strength of 560 MPa and elongation of 12 % of the L-PBF Al-Mg-Sc-Zr alloy. The high strength of the alloy was attributed to the hierarchical formation of the Sc-rich phase, exerting a "dragging effect" on intergranular boundary migration as well as a "pinning effect" on intragranular dislocation sliding. (c) 2023 Elsevier B.V. All rights reserved.
通讯机构：
[Yonggang Tong] C;College of Automobile and Mechanical Engineering, Changsha University of Science and Technology, Changsha, People’s Republic of China
摘要：
Developing advanced materials with excellent mechanical properties and high-temperature oxidation performance are important to the potential application in high-temperature structural parts. In the paper, CoCrNiAlxY (x = 0.2, 0.6, 1.0 and 1.4) middle entropy alloys were prepared, and the effects of Al content on the microstructure, mechanical properties and oxidation behavior at 1200 degrees C of CoCrNiAlxY middle entropy alloys were studied. The phase of CoCrNiAlxY alloys is changing from FCC to BCC with increasing Al content; thereinto, CoCrNiAl0.6Y alloy forms duplex FCC plus BCC phase structure. The hardness and fracture strength of CoCrNiAlxY (x = 0.2, 0.6, 1.0) alloys increase with increasing Al content. When Al content is 1.4, the hardness and fracture strength of CoCrNiAl1.4Y alloy decrease, which result from the tiny variation of alloy microstructure. The oxidation behavior at 1200 degrees C of CoCrNiAlxY alloys confirms that compact aluminum oxide film can be formed on the CoCrNiAl0.6Y alloy, which slows down the oxidation rate of the alloy. The CoCrNiAl0.6Y alloy has the best oxidation resistance with lower oxidation rate of 1.467 x 10(-11) g(2)/(cm(4) s).
作者机构：
Institute for Quantum Science and Technology, College of Science, Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha 410073, China;College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha 410114, China;Spin-X Institute, School of Chemistry and Chemical Engineering, State Key Laboratory of Luminescent Materials and Devices, Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials, South China University of Technology, Guangzhou 510641, China;Beijing National Laboratory of Molecular Science, Beijing Key Laboratory of Magnetoelectric Materials and Devices, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
关键词：
materials.;QUANTUM;SUPERPOSITION
摘要：
The implementation of information technology relies on functional chemicals and materials.Semiconductors have ...展开更多 The implementation of information technology relies on functional chemicals and materials.Semiconductors have led to the rise of the electronic information era.As the next generation of information technology,how to implement quantum information processing has become an urgent task[1].In order to carry superposition state and entanglement,systems,which are better isolated from environment,are designed to boost the quantum coherence time.For example,superconducting circuits,which are the leading candidate of quantum processor,uses the transmon design and the mK temperature condition to reduce the influence of environmental noise.收起
作者机构：
[Jiang, Yong; Lu, Anxian; Lin, Xiangtao; Jiang, Y; Wang, Zhikai; Liu, Songxuan; Jiang, Xingxing; Liu, Lidan] Cent South Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China.;[Ning, Tianxiang] Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410114, Peoples R China.;[Ning, Tianxiang] Hunan LEED Elect Ink Co Ltd, Zhuzhou 412000, Hunan, Peoples R China.
通讯机构：
[Lu, AX ; Jiang, Y; Ning, TX ] C;Cent South Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China.;Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410114, Peoples R China.
关键词：
Ga 2 O 3 modifier;Glass ceramic;Crystallization behavior;Fluorescence properties
摘要：
This paper focuses on the effects of Ga2O3/GeO2 ratios and heat treatment on the structure, crystallization and fluorescence properties of Gd2O3-Ga2O3-GeO2-Nd2O3 glass system. According to the results, the glass network's structural stability suffers when the ratio of Ga2O3/GeO2 is low. As the ratio of Ga2O3/GeO2 continues to increase, Ga3+ ions are transformed into [GaO4] to participate in the construction of the glass network structure. The principal phase of glass-ceramics is GdGaGe2O7, and the secondary phase is Ga4GeO8, GeO2 and Gd3Ga5O12. Moreover, the glasses with high content of Ga2O3 is easier to prepare translucent glass-ceramics with uniform grain distribution and size. The emission spectrum intensity of glass-ceramics is obviously improved compared with that of glasses. In addition, it is found that the emission peak of Nd3+ ions generated by 4F3/2 -> 4I11/2 electron transition is stably redshifted from 1060 nm to 1088 nm by microcrystallization, which means a small range of spectrum is adjustable.
通讯机构：
[Jianxiao Yang; Ruixuan Tan] A;Authors to whom correspondence should be addressed.<&wdkj&>Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology, College of Materials Science and Engineering, Hunan University, Changsha 410082, China
摘要：
Lightweight, high-temperature-resistant carbon-bonded carbon fiber (CBCF) composites with excellent thermal insulation properties are desirable materials for thermal protection systems in military and aerospace applications. Here, glucose was introduced into the polyacrylamide hydrogel to form the glucose-polyacrylamide (Glu-PAM) hydrogel. The CBCF composites were prepared using the Glu-PAM hydrogel as a brand-new binder, and the synergistic effect between glucose and acrylamide was investigated. The results showed the Glu-PAM hydrogel could limit the foaming of glucose and enhance the carbon yield of glucose. Meanwhile, the dopamine-modified chopped carbon fiber could be uniformly mixed by high-speed shearing to form a slurry with the Glu-PAM hydrogel. Finally, the slurry was successfully extruded and molded to prepare CBCF composites with a density of 0.158 similar to 0.390 g cm(-3) and excellent thermal insulation performance and good mechanical properties. The compressive strength of CBCF composites with a density of 0.158 g cm(-3) in the Z direction is 0.18 MPa, and the thermal conductivity in the Z direction at 25 degrees C and 1200 degrees C is 0.10 W m(-1) k(-1) and 0.20 W m(-1) k(-1), respectively. This study provided an efficient, environment-friendly, and cost-effective strategy for the preparation of CBCF composites.
通讯机构：
[Liu, Z; Liu, Z ; Guo, ZH ; Bai, L ] N;Nanchang Hangkong Univ, Natl Def Key Disciplines Lab Light Alloy Proc Sci, Nanchang 330063, Jiangxi, Peoples R China.;Nanchang Hangkong Univ, Sch Aeronaut Mfg Engn, Nanchang 330063, Jiangxi, Peoples R China.;NanChang JiaoTong Inst, Nanchang 330100, Jiangxi, Peoples R China.
关键词：
Electron beam direct energy deposition;Anisotropy;Uniform elongation;Columnar morphology;Ti–6Al–4V alloy
摘要：
Additive manufactured titanium alloys are generally characterized by columnar grain structures along the vertical direction (VD), thereby causing a relative lower plasticity in the horizontal direction (HD) than that in the VD direction. However, herein we report that such columnar grain structures in the Ti-6Al-4V alloy produced by electron beam direct energy deposition (EB DED) can induce a superior uniform elongation in the HD direction than that in the other loading directions (22.5 degrees ,45 degrees, 67.5 degrees and VD directions). Besides the orientation of alpha laths with a favorable soft and hard match when the loading direction is along the HD, such anisotropic plasticity also can be attributed to the columnar grain structures which can also effectively prevent dislocation slip and suppress the necking of the HD sample, thereby triggering a greater work-hardening rate and strain hardening exponent in the stage of uniform deformation, and increasing the uniform elongation in the HD. The greater total elongation in the VD is mainly reflected in its higher non-uniform elongation, rather than uniform elongation, which is mainly caused by the alpha laths possessing easily activated basal slip system inducing strain softening. As for the 22.5 degrees and 45 degrees samples, most of the alpha laths under such loading directions present hard orientation, thereby leading to both lower non-uniform elongation and total elongation. The above information offers a deeper understanding about anisotropic plasticity in additive manufactured titanium alloys, thereby providing a theoretical basis for optimizing the consistency of mechanical properties.
关键词：
aluminum batteries;organic cathode;molecular design;sulfurization;density functional theory
摘要：
Thispaper reports SPTCDA cathode for green and sustainablealuminum organic battery. Aluminumbatteries with aluminum as the anode and organic materialsas the cathode have continuously drawn considerable attention becauseof their high theoretical energy density, natural abundance, and environmentallybenign nature. Herein, we have done an elaborate design work on thebasis of & pi;-& pi; conjugated organic molecule PTCDAby a molecular engineering strategy. Introducing a sulfur atom toreplace the H atom in the aromatic ring of the PTCDA molecule to formSPTCDA (sulfurized PTCDA) with p-& pi; conjugated systemcan reduce the energy level of the molecule. In addition, the extensionof the conjugated system makes the electrons more delocalized, whichis beneficial to the improvement of the conductivity of SPTCDA. Experimentalresults show that compared with pristine PTCDA, SPTCDA has a morestable structure and better cycle performance, rate capability, andcoulombic efficiency, as well as a higher discharge voltage plateau.To further understand the electronic structure, operating voltage,and correct redox mechanism, density functional theory (DFT) calculationswere performed for PTCDA and SPTCDA. The diffusion behavior of ionson the electrode surface was also discussed. This work reveals animportant molecular structure design strategy for a carbonyl cathode,in order to break the application limitations of this electrode materialon aluminum organic batteries.
作者机构：
[Ding, Junwei; Ji, Xiaoyan; Hu, Haiman; Li, Jiajia; Ji, XY] Lulea Univ Technol, Div Energy Sci, Energy Engn, S-97187 Lulea, Sweden.;[Luo, Shuangjiang; Li, Jiajia; Zhang, Haitao; Fang, Wenhao] Chinese Acad Sci, Inst Proc Engn, CAS Key Lab Green Proc & Engn, Beijing Key Lab Ion Liquids Clean Proc, Beijing 100190, Peoples R China.;[Yuan, Du] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, 960, 2nd Sect,Wanjiali RD S, Changsha 410004, Hunan, Peoples R China.
通讯机构：
[Ji, XY ] L;[Zhang, HT ] C;Lulea Univ Technol, Div Energy Sci, Energy Engn, S-97187 Lulea, Sweden.;Chinese Acad Sci, Inst Proc Engn, CAS Key Lab Green Proc & Engn, Beijing Key Lab Ion Liquids Clean Proc, Beijing 100190, Peoples R China.
关键词：
chemical bonding;fluorine;lithium metal batteries;solid-electrolyte interphase
摘要：
LiF-rich solid-electrolyte-interphase (SEI) can suppress the formation of lithium dendrites and promote the reversible operation of lithium metal batteries. Regulating the composition of naturally formed SEI is an effective strategy, while understanding the impact and role of fluorine (F)-based Li-salts on the SEI characteristics is unavailable. Herein, LiFSI, LiTFSI, and LiPFSI are selected to prepare solid polymer electrolytes (SPEs) with poly(ethylene oxide) and polyimide, investigating the effects of molecular size, F contents and chemical structures (F-connecting bonds) of Li-salts and revealing the formation of LiF in the SEI. It is shown that the F-connecting bond is more significant than the molecular size and F element contents, and thus the performances of cells using LiPFSI are slightly better than LiTFSI and much better than LiFSI. The SPE containing LiPFSI can generate a high amount of LiF, and SPEs containing LiPFSI and LiTFSI can generate Li3N, while there is no Li3N production in the SEI for the SPE containing LiFSI. The preferential breakage bonds in LiPFSI are related to its position to Li anode, where Li-metal as the anode is important in forming LiF, and consequently the LiPFSI reduction mechanism is proposed. This study will boost other energy storage systems beyond Li-ion chemistries.
期刊：
Journal of Colloid and Interface Science,2023年640:710-718 ISSN：0021-9797
通讯作者：
Qin, Wei;Jia, Chuankun
作者机构：
[Luo, Gang; Zhou, Ningfang; Wu, Chun; Jia, Chuankun; Qin, Wei] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha, Hunan, Peoples R China.;[Zhou, Ningfang] Chinese Acad Sci, Ganjiang Innovat Acad, Ganzhou 341119, Jiangxi, Peoples R China.
通讯机构：
[Qin, Wei; Jia, Chuankun] C;College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha, Hunan, China. Electronic address:
关键词：
Anode;Boron doped Co(3)O(4);Reduced graphene oxide;Sodium ion batteries
摘要：
Heteroatom doping is one of the feasible strategies to improve electrode efficiency. Meanwhile, graphene helps to optimize structure and improve conductivity of the electrode. Here, we synthesized a composite of boron-doped cobalt oxide nanorods coupled with reduced graphene oxide by a one-step hydrothermal method and investigated its electrochemical performance for sodium ion storage. Because of the acti-vated boron and conductive graphene, the assembled sodium-ion battery shows excellent cycling stabil -ity with a high initial reversible capacity of 424.8 mAh g-1, which is maintained as high as 444.2 mAh g-1 after 50 cycles at a current density of 100 mA g-1. The electrodes also exhibit excellent rate performance with 270.5 mAh g-1 at 2000 mA g-1, and retain 96% of the reversible capacity upon recovery from 100 mA g-1. This study shows that boron doping can increase the capacity of cobalt oxides and graphene can stabilize structure and improve conductivity of the active electrode material, which are essential for achieving satisfactory electrochemical performance. Therefore, the doping of boron and introduction of graphene may be one of the promising means to optimize the electrochemical performance of anode materials. (c) 2023 Elsevier Inc. All rights reserved.
作者：
Jiang, H.;Yu, K. P.;Liu, X. C.;He, L. H.;He, B. B.;...
期刊：
Scripta Materialia,2023年237:115683 ISSN：1359-6462
通讯作者：
Huang, M;He, B
作者机构：
[Jiang, H.; Huang, M. X.; Yu, K. P.; Huang, M] Univ Hong Kong, Dept Mech Engn, Pokfulam Rd, Hong Kong, Peoples R China.;[He, B. B.; Yu, K. P.] Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen 518055, Peoples R China.;[Liu, X. C.] Changsha Univ Sci & Technol, Inst Met, Coll Mat Sci & Engn, Changsha 410114, Peoples R China.;[He, L. H.] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China.;[He, L. H.] Spallat Neutron Source Sci Ctr, Dongguan 523803, Peoples R China.
通讯机构：
[Huang, M ] U;[He, B ] S;Univ Hong Kong, Dept Mech Engn, Pokfulam Rd, Hong Kong, Peoples R China.;Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen 518055, Peoples R China.
摘要：
The concept of compositionally complex alloy (CCA) has recently been applied in developing compositionally complex oxide (CCO). In this contribution, we discovered a new CCO with a spinel structure that is embedded in a new body-centered cubic CCA matrix. The crystal structure of the newly found CCO is characterized by neutron diffraction and high-resolution transmission electron microscopy. It is found that the chemical formula of the new CCO is Mn(V,Ti,Al)2O4, where the Mn atoms occupy the tetrahedral position while the V, Ti and Al atoms share the octahedral sites. The elements that take the octahedral sites are interchangeable. The mechanical behavior was characterized by nano-indentation experiments and the localized strength of CCA is effectively promoted with the existence of CCO. The present work illustrates that the combination of new CCO with new CCA matrix could be a new strategy to develop new oxide-metal composites.
