通讯作者：
Guoqiang Zou<&wdkj&>Guoqiang Zou Guoqiang Zou Guoqiang Zou
作者机构：
[Hou, Hongshuai; Deng, Wentao; Ji, Xiaobo; Xiong, Dengyi; Cao, Ziwei; Hu, Jiugang; Zou, Guoqiang] Cent South Univ, Coll Chem & Chem Engn, Changsha 410083, Peoples R China.;[Yang, Li] Hunan Univ Technol & Business, Changsha 410205, Hunan, Peoples R China.;[Li, Fengrong] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410114, Peoples R China.;[Ji, Xiaobo] Zhengzhou Univ, Sch Mat Sci & Engn, Zhengzhou 450001, Peoples R China.
通讯机构：
[Guoqiang Zou; Guoqiang Zou Guoqiang Zou Guoqiang Zou] C;College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083 China
关键词：
high-density SEI;zinc metal anodes;Zn ion capacitors
摘要：
The schematic diagram of the process of Zn2+ deposition on bare zinc, solid electrolyte interphase (SEI), and highly dense solid electrolyte interphase (HDSEI). Zinc ions are deposited uniformly on HDSEI, where as on SEI bare zinc shorten the lifetime of the cell due to dendrites, corrosion, hydrogen evolution reaction as well as other side reactions, etc. Abstract Aqueous zinc anode has been re‐evaluated due to the superiority in tackling safety and cost concerns. However, the limited lifespan originating from Zn dendritic and side reactions largely hamper commercial development. Currently, the coating prepared by simple slurry mixing is leaky and ineffectively isolate sulfate and water. Herein, inspired by the DFT calculations and the easy hydrolysis characteristic of MIL‐125 (Ti), an in‐situ grown high‐dense TiO2‐x solid electrolyte interphase (HDSEI) with rich oxygen vacancies is successfully constructed in an aqueous electrolyte, in which the oxygen vacancies not only strengthen the hydrogen binding force thereby inhibiting the hydrogen precipitation by‐reaction, but also reduce the migration energy barrier of zinc ions and enhance the mechanical properties. Profiting from the HDSEI, symmetric Zn cells survive up to remarkable 4200 h at 1 mA cm−2, nearly 42‐times than that of bare Zn anodes. In situ optical microscopy clearly reveals that the in situ grown HDSEI homogenizes the zinc deposition process, while bare zinc without HDSEI shows significant dendrites, confirming the protective nature of HDSEI. Furthermore, full Zn ion capacitors can deliver excellent electrochemical performance, providing a feasible in situ approach to construct HDSEI to implement dendrite‐free metal anodes.
通讯机构：
[Xiaobo Zhu; Mei Ding; Chuankun Jia] I;Institute of Energy Storage Technology, Changsha University of Science and Technology, Changsha 410114, China<&wdkj&>College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha, 410114, China
摘要：
Rechargeable alkali-ion (Li+, Na+, and K+) batteries with high conversion efficiency have attracted much attention for portable and sizeable energy storage. Deriving valuable battery materials from valueless waste materials is highly desirable to meet the surging demand of energy storage. However, waste-derived carbon materials often show low specific capacity and poor reversibility due to untamed physiochemical properties. In this paper, nitrogen doped meso-macroporous carbon (NMPC) materials are produced from waste asphalt with the assistance of nano-Fe2O3 template and melamine modification. The products show interconnected threedimensional meso-macroporous structures and tunable nitrogen contents. As an anode material for Li-ion batteries, the NMPC with optimum nitrogen content delivers a reversible capacity of 602.3 mA h g(-1) at 0.2 A g(-1). Furthermore, it also discharges a reversible capacity of 210.8 mA h g 1 after 200 cycles and 201.5 mA h g(-1) after 500 cycles for Na-ion batteries and K-ion batteries, respectively. The excellent and versatile electrochemical properties enable the concept of waste recovery and resource utilization, which can be used for the manufacture of environmentally friendly energy storage systems.
摘要：
Fused filament fabrication (FFF) technology will facilitate the standardization of consumables and printing equipment for the additive manufacturing of engineered ceramics. In this study, a thermoplastic elastic binder based on styrene ethylene butylene styrene (SEBS) was optimized to realize the preparation of flexible filaments with solid loading of 43 vol%. The rheology, stress-strain behavior, and printing performance of the filament were systematically evaluated, and the feasibility of the fabrication of complex-shaped parts was verified. A microstructure model of the filament was innovatively established. The printed parts are suitable for solvent debinding at 40 degrees C, followed by thermal debinding and sintering to obtain dense zirconia ceramic materials. Microstructural analysis revealed two types of typical defects, interlayer bonding defects with a scale of about 1 & mu;m and triangular voids at path intersections with a scale of about 10 & mu;m. Zirconia ceramics with a relative density of 99.1% and a flexural strength of 492.8 & PLUSMN; 40 MPa was obtained by the FFF method.
摘要：
In order to obtain better joints, Ti was added to Ag-Cu eutectic solder in this paper, and YG8/IN718 joints were prepared with Ag26.7Cu4.5Ti filler alloy by vacuum brazing at the range of 870-960 celcius. Then the interface microstructure, element distribution, phase change and fracture behavior of the prepared YG8/IN718 joints were tested and analyzed. Through experiments, we successfully realized vacuum brazing between YG8 and IN718. The joints with gradient structure of "YG8| intermediate layer| diffusion layer| IN718" can be formed during brazing. Tight bonding cannot be achieved between the intermediate layer and each interface when the brazing temperature is too low (870 celcius), while the residual stress will increase and crack will be easy to occur in the intermediate layer when the brazing temperature is too high (960 celcius).
通讯机构：
[Qin, W ] C;Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410114, Peoples R China.
关键词：
Anode;Binder;Lithium ion batteries;Sulphur doping;Ti(3)C(2)T(x)
摘要：
MXenes are regarded as promising electrode materials for lithium-ion batteries owing to their high electrical conductivity and two-dimensional structure but suffer from low intrinsic specific capacities. In this study, we fabricate sulphur-doped multilayer Ti(3)C(2)T(x) MXenes via calcination and annealing using sublimed sulphur as the sulphur source. After sulphur doping, the interlayer spacing of Ti(3)C(2)T(x) increases, which is favourable for Li-ion insertion. The Ti(3)C(2)T(x) MXene@S composite exhibits excellent electrochemical performance. A high reversible specific capacity of 393.8 mAh g(-1) at a current density of 100mAg(-1) after 100 cycles is obtained. Additionally, a negative fading phenomenon is observed when the specific capacity increases to 858.9 mAh g(-1) after 2550 cycles at 1 A g(-1) and to 322.2mAhg(-1) after 3600 cycles at 5 A g(-1) from the initial 267.3 mAh g(-1). We systematically investigate the effects of two different binders (polyvinylidene difluoride and carboxymethyl cellulose, hereinafter abbreviated as PVDF and CMC, respectively) on the electrochemical performance of the Ti(3)C(2)T(x) MXene@S composite and discovered that the electrode using the CMC binder exhibits better lithium-ion storage performance than that using the PVDF binder, which is attributed to the lower charge transfer resistance, higher ion diffusivity, and enhanced adhesion force.
作者机构：
[He, Murong; Jia, CK; Jia, Chuankun; Fu, Hu; Lou, Xuechun; Ding, Mei; Lu, Bo] Changsha Univ Sci & Technol, Inst Energy Storage Technol, Changsha 410114, Peoples R China.;[He, Murong; Jia, CK; Jia, Chuankun; Fu, Hu; Lou, Xuechun; Ding, Mei; Lu, Bo] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410114, Peoples R China.;[Han, Zhiyuan; Zhou, Guangmin; Chen, Biao] Tsinghua Univ, Tsinghua Berkeley Shenzhen Inst, Shenzhen Geim Graphene Ctr, Shenzhen 518055, Peoples R China.;[Han, Zhiyuan; Zhou, Guangmin; Chen, Biao] Tsinghua Univ, Tsinghua Shenzhen Int Grad Sch, Shenzhen 518055, Peoples R China.;[Chu, Shengqi] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China.
通讯机构：
[Jia, CK ; Ding, M] C;[Zhou, GM ] T;Changsha Univ Sci & Technol, Inst Energy Storage Technol, Changsha 410114, Peoples R China.;Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410114, Peoples R China.;Tsinghua Univ, Tsinghua Berkeley Shenzhen Inst, Shenzhen Geim Graphene Ctr, Shenzhen 518055, Peoples R China.
关键词：
energy storage;flow battery;high energy density;permanganate;graphene-modified electrode
摘要：
Redox flow batteries (RFBs) as promising technologies for energy storage have attracted burgeoning efforts and have achieved many advances in the past decades. However, for practical applications, the exploration of high-performance RFB systems is still of significance. In this work, inspired by the high solubility and low cost of both polysulfides and permanganates, the S/Mn RFBs with S(4)(2-)/S(2)(2-) and MnO(4)(-)/MnO(4)(2-) as negative and positive redox pairs are demonstrated. Moreover, to solve the poor cycling performance caused by the sluggish kinetics of polysulfide-involved redox reactions and instability of the carbon felt (CF) electrode in the strong oxidative and corrosive catholyte, both the anode and cathode are designed to obtain high performance. Herein, the NiS(x)/Ni foam exhibiting electrocatalysis activity toward polysulfide ions is prepared and works as the anode while the graphene-modified carbon felt (G/CF) with high stability is fabricated and utilized as the cathode. Additionally, NaMnO(4) with a high solubility limit (3.92 M) in the alkaline supporting electrolyte is preferred to KMnO(4) as the redox-active molecule in the catholyte. The resulting S/Mn RFB cells show outstanding cell performance, such as high energy density (67.8 Wh L(-1)), long cycling lifetime with a temporal capacity fade of 0.025% h(-1), and low chemical cost of electrolytes (17.31 $ kWh(-1)). Moreover, a three-cell stack shows good cycling stability over 100 cycles (226.8 h) with high performance, verifying the good scalability of the proposed S/Mn RFB system. Therefore, the present strategy provides a reliable candidate for stable, energy-dense, and cost-effective devices for future energy storage applications.
作者机构：
[Yang, Fen; Jin, Hong-Guang; Deng, Hai-Guang; Xu, Wen-Jie; Huang, Bo-Xuan; Gu, Jia-Xin; Lin, Wei] Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410114, Peoples R China.;[Li, Guangli] Hunan Univ Technol, Coll Life Sci & Chem, Zhuzhou 412007, Peoples R China.;[Gu, Zhi-Gang] Chinese Acad Sci, Fujian Inst Res Struct Matter, State Key Lab Struct Chem, Fuzhou 350002, Fujian, Peoples R China.;[Gu, Zhi-Gang] Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
通讯机构：
[Zhi-Gang Gu; Hong-Guang Jin] S;School of Materials Science and Engineering, Changsha University of Science & Technology, Changsha 410114, China<&wdkj&>State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China<&wdkj&>University of Chinese Academy of Sciences, Beijing 100049, P. R. China
关键词：
metal-organic framework;photocatalytic oxidative coupling of amine;photoinduced electron transfer;porphyrin;naphthalene diimide
摘要：
Precipitation of multiple strong nanoprecipitates is crucial for the development of ultrahigh-strength structural materials with a strength of 2.5 GPa or above. Nevertheless, the ductility usually loses rapidly with strength due to limited dislocation mobility and high cracking tendency if coarse non-deformable precipitates are employed. Herein, we report a 2.5 GPa maraging steel strengthened by an ultrahigh den-sity of intermeshed shearable nanostructures consisting of Ni(Al, Fe) nanoprecipitates and Mo-rich ( similar to 30 at.%) disordered clusters, both of which assume coherent interfaces. The fully coherent B2-Ni(Al, Fe) par-ticles precipitate in an extremely fast fashion, effectively accelerating local aggregation of low-diffusivity Mo atoms and promoting the formation of Mo-rich clusters surrounding them. This elemental partition was found to be further enhanced by Co addition via depleting both residual Al and Mo within the ma-trix, leading to the formation of copious yet fine intermeshed nanostructures. During plastic deformation, the interlocked nanostructures not only enhance local cutting stress by combining long-range elastic and short-range chemically ordering effects but also improve dislocation activity and resist shear-induced plastic instability. The multiple shearable nanostructures endow decent ductility (> 6%) of the 2.5 GPa steel, suggesting a new paradigm for designing ultrastrong steels.(c) 2023 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
摘要：
A cost-effective and facile method for chemical synthesis of manganese-based sulfides (MS) and investigation of the structure, morphology, and electrochemical properties have been reported in this work. The MS electrode exhibits exceptional electrochemical performances including ultrahigh specific capacitance (8.2 F cm-2), excellent cycle life (88.6 % retention after 3500 cycles), and good rate capability (86.6 % retention at 50 mA cm-2). Furthermore, to solve the shortcomings of liquid electrolyte supercapacitors, including electrolyte leakage, corrosion, and environmental pollution, a solid-state supercapacitor assembled with MS positive electrode and camphor seed derived carbon (CSDC) negative electrode have been successfully fabricated (MS// CSDC), which shows a maximum specific capacitance about 351.9 mF cm-2 with capacitance retention about 87.6 % after 2500 cycles. Specifically, the energy density of 0.55 mWh cm-3 at a power density of 11.25 mW cm-3 can be achieved, demonstrating excellent supercapacitive behaviors of such as-fabricated device. Furthermore, the CV curves of such device prior to and following bending do not change significantly at 10 mV s-1, which indicates good mechanical flexibility and stability. Notably, the asymmetric MS//CSDC solid-state supercapacitors connected in series can quickly illume red LEDs, emerging their practical application prospects for such prepared flexible devices.
摘要：
Plastic deformation usually improves the strength of Cu alloys by introducing high density dislocations and refined grains, but inevitably reducing electrical conductivity and ductility. Here we demonstrate that three exclusive properties, i.e., strength, conductivity, and ductility can be simultaneously enhanced in commercialized Cu-Cr-Zr plates through the well-controlled thermomechanical treatment. Very high strain cold rolling with a thickness reduction of 98% is applied, resulting in the formation of ultra-fine lamellar structures with an average size of 146 nm, which contributes to high tensile strength of 643 MPa. However, the elongation and electrical properties are poor. The subsequent aging treatment at a low temperature of 400 degrees C for 5 h introduces high density coherent Cr precipitates in those lamellar structures, while keeping the lamellar thickness almost unchanged. The aged Cu-Cr-Zr alloy exhibit high strength of 592 MPa, high conductivity of 86.8% IACS, and adequate elongation of 15.5%. This work proposes a strategy of overcoming the strength-ductility and strength conductivity trade-off relationships in industrial Cu products through the balanced manipulation of grain morphology and grain interior precipitation.
通讯机构：
[Weiguo Mao] C;College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha 410114, China<&wdkj&>Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha 410073, China
摘要：
B4C has been widely used as a sintering aid for the densification of ZrB2-based ceramics by pressureless sintering. In this study, the effect of B4C on the sintering and ablation mechanism for PyC-Csf/ZrB2-SiC-ZrC ceramics are investigated. The results show that the addition of B4C improves sintering by removing oxide impurities from the grain surface, and inhibiting grain growth by pinning the grain-boundary movement as second phase particles. The structure of PyC-Csf/ZrB2-SiC-ZrC ceramics remained intact after ablation at 2000 degrees C for 120 s. The mass ablation rate of sample #4 with 14% B4C (-9.17 x10-4 g/s) is close to 0. A Zr-Si-O layer and ZrO2 layer are formed on the samples' surface to prevent oxygen diffusion.
摘要：
A new medical neutral boroaluminosilicate glass with thermal and chemical stabilities conforming to interna-tional standards has been successfully prepared by the traditional melt cooling method. Based on X-ray photo-electron spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FTIR) characterizations, the relationship between the structure and physical and chemical properties of the glass was discussed. The increase of Al2O3 introduction led to the continuous increase of the octahedral proportion of [AlO6], and weakened the degree of glass network connection, which resulted in the increase of thermal expansion coefficient of the glass and the decrease of chemical stability. B3+ ions and Al3+ ions have a competition for free oxygen and basic metal ions, which caused obvious boron-aluminum anomaly. The research has certain guiding significance for the performance standard of medical glass materials and the control of industrial development cost.
摘要：
This study investigates the optimal extraction conditions, monosaccharide composition, and antioxidant activity analysis of polysaccharides from the aerial parts of three different varietal varieties of Gastrodia (i.e., G. elata Bl. F. elata, G. elata Bl. F. Viridls MaKino, and G. elata Bl. F. Glauca S Chow). The influence of extraction temperature (30–70 °C), extraction time (15–55 min), and liquid-to-solid ratio (25–65 mL/g) on the yield of polysaccharides was analyzed through single-factor experiments. The response surface methodology was used to optimize the extraction process, and a mathematical model was established to obtain the optimal extraction conditions. The response surface experiment was presented as follows: The optimal extraction conditions for polysaccharides were a liquid-to-solid ratio of 59 mL/g, 56 °C, and 36 min. The polysaccharide yield in G. elata. Bl. F. Glauca S Chow aerial parts under these conditions was 10.90%, which was close to the theoretical value calculated by the model (10.64%). Under the optimal conditions, the yields of polysaccharides followed: G. elata Bl. F. elata (11.32%) > G. elata Bl. F. Glauca S Chow (10.90%) > G. elata Bl. F. Viridls MalKino (10.50%). The polysaccharides were mainly composed of 10 monosaccharides, including glucose, rhamnose, mannose, and xylose. However, the content of monosaccharides in polysaccharides of different varieties of Gastrodia elata Bl aerial parts varied greatly, with glucose and rhamnose being the highest, both exceeding 20%. The polysaccharides in different varieties of Gastrodia elata Bl aerial parts had certain in vitro antioxidant activity. The total reducing power and scavenging rates of 2,2-diphenylpicrylhydrazyl (DPPH) and 2,2′-azinobis-(3-ethylbenzthiazolin-6-sulfonic acid) (ABTS) free radicals increased with the increase of polysaccharide concentration. When the polysaccharide concentration was 1.0 mg/mL, the scavenging rates of DPPH and ABTS free radicals were both over 80%. This study provides a theoretical basis for the further development and utilization of Gastrodia elata Bl aerial part resources.
Using ultrasound-assisted extraction and response surface methodology to optimize the extraction of polysaccharides from the aerial parts of Gastrodia elata, polysaccharide yields of three different G. elata varieties were all above 10%, and the extracted polysaccharides were composed of 10 monosaccharides, including glucose and galactose, and exhibited good in vitro antioxidant activity.
摘要：
Platinum-based electrocatalysts possess high water electrolysis activity and are essential components for hydrogen evolution reaction (HER). A major challenge, however, is how to break the cost-efficiency trade-off. Here, a novel defect engineering strategy is presented to construct a nanoporous (FeCoNiB0.75)(97)Pt-3 (atomic %) high-entropy metallic glass (HEMG) with a nanocrystalline surface structure that contains large amounts of lattice distortion and stacking faults to achieve excellent electrocatalytic performance using only 3 at% of Pt. The defect-rich HEMG achieves ultralow overpotentials at ampere-level current density of 1000 mA cm(-2) for HER (104 mV) and oxygen evolution reaction (301 mV) under alkaline conditions, while retains a long-term durability exceeding 200 h at 100 mA cm(-2). Moreover, it only requires 81 and 122 mV to drive the current densities of 1000 and 100 mA cm(-2) for HER under acidic and neutral conditions, respectively. Modelling results reveal that lattice distortion and stacking fault defects help to optimize atomic configuration and modulate electronic interaction, while the surface nanoporous architecture provides abundant active sites, thus synergistically contributing to the reduced energy barrier for water electrolysis. This defect engineering approach combined with a HEMG design strategy is expected to be widely applicable for development of high-performance alloy catalysts.
摘要：
We report a low-cost, high theoretical specific capacity π-conjugated organic compound (PTCDA) with C═O active centers as the cathode material in aluminum organic batteries. In addition, in order to improve the electron transport rate of PTCDA, a new method is proposed in this paper, which uses physical vapor deposition (PVD) method to make PTCDA recrystallize and grow on stainless steel and quartz glass substrates to improve its crystallinity. The increase of crystallinity expands the PTCDA π-π-conjugated system, making electrons more delocalized, which is beneficial to the transmission rate of electrons and ions, thereby enhancing the conductivity of the material. The experimental results show that compared with pristine PTCDA, PTCDA(Ss) and PTCDA(G) with higher crystallinity have better cycling stability and rate capability. The DFT (density functional theory) results indicated that the electron-deficient carbonyl group in the PTCDA molecule could reversibly coordinate/dissociate with the positively charged Al complex ions (AlCl(2)(+)). This research work provides insights into the rational design of low-dimensional, high-crystallinity, high-performance cathode materials for green aluminum organic batteries.
摘要：
High-temperature oxidation environments have an important influence on phase transition and thermal/residual stresses of Si/BSAS/Yb2SiO5 environmental barrier coatings (EBCs). To further reveal the failure mechanisms of Yb2SiO5 EBCs, different kinds of Si, BSAS, Yb2SiO5 coatings deposited on Cf/SiC composites were prepared by air plasma spraying (APS) technique, respectively. The content and microstructure variations of all coatings before and after different heat treatments were analyzed by X-ray diffraction and scanning electron microscope methods, respectively. The corresponding Vickers hardness, fracture toughness and residual stresses were evaluated by indentation tests at room temperature. The hardness and fracture toughness of the coating after heat treatment at 1200 degrees C were systematically studied. It is found that with the increase of heat treatment, the porosity of the coating decreases, and the hardness and fracture toughness of the coating increases. Porosity of the coating is affected by phase transformation and grain growth. The residual compressive stress of the coating is positively correlated with the hardness and fracture toughness of the coating.
