期刊：
Journal of Materials Science,2023年58(7):3066-3077 ISSN：0022-2461
通讯作者：
Zheqiong Fan<&wdkj&>Hao He
作者机构：
[He, Hao; Liu, Xiang; He, Zhanglong; Zhao, Chen; Li, Tao; Liu, Yuling; Liu, Shan; Fan, Zheqiong] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha, Peoples R China.;[He, Hao] City Univ Hong Kong, Shenzhen Res Inst, Shenzhen, Peoples R China.;[Wang, Xiaodong] Cent South Univ, Changsha, Peoples R China.
通讯机构：
[Zheqiong Fan; Hao He] C;College of Materials Science and Engineering, Changsha University of Science & Technology, Changsha, China<&wdkj&>College of Materials Science and Engineering, Changsha University of Science & Technology, Changsha, China<&wdkj&>Shenzhen Research Institute, City University of Hong Kong, Shenzhen, China
摘要：
MnO2 is a promising catalyst for oxygen reduction and metal-air batteries due to the natural abundance, low cost and nontoxicity. Improving its activity is an important challenge for its large-scale commercialization. Defect engineering and heteroatom doping are the most effective means and can be easily operated through plasma treatment at different atmospheres. In this work, defects on MnO2 are manufactured via rapid plasma treatment at Ar atmosphere while both defects and N-doping are simultaneously fabricated at N-2 atmosphere. N-MnO2 exhibits a greatly enhanced ORR activity with a half-wave potential of 0.84 V, a limiting current density of 6.7 mA cm(-2) and the number of transferred electrons of 3.9. In neutral Mg-air battery, N-MnO2-based battery exhibits a max power density of 124.3 mW cm(-2) at a current density of 255.4 mA cm(-2) and excellent stability under different working condition. These superior performances of N-MnO2 to Ar-MnO2 and pristine alpha-MnO2 demonstrate that the defects and N-doping by plasma treatment at N-2 atmosphere significantly enhance the oxygen reduction activity. This work reveals the relationship between microstructure and oxygen reduction reaction and supplies a new idea for the developing economical and efficient oxygen reduction reaction catalysts for metal-air batteries. [GRAPHICS]
期刊：
Journal of Alloys and Compounds,2023年968:171946 ISSN：0925-8388
通讯作者：
Jia, CK
作者机构：
[He, Xinyan; Jia, CK; Xu, Zhizhao; Jia, Chuankun; Fu, Hu; Ding, Mei; Wu, Wenze; Hu, Zhengyu] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410114, Peoples R China.;[He, Xinyan; Xu, Zhizhao; Jia, Chuankun; Fu, Hu; Ding, Mei; Wu, Wenze; Hu, Zhengyu] Changsha Univ Sci & Technol, Inst Energy Storage Technol, Changsha 410114, Peoples R China.;[Wu, Kai; Zheng, Pandong; Han, Lei] State Grid Zhejiang Elect Power Co Ltd, Huzhou Power Supply Co, Huzhou 313000, Peoples R China.;[Wu, Kai; Zheng, Pandong] Huzhou Elect Power Design Inst Co Ltd, Huzhou 313000, Peoples R China.
通讯机构：
[Jia, CK ] C;Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410114, Peoples R China.
关键词：
Energy storage;Vanadium redox flow battery;Waste peanut-shell;Electrode;Energy efficiency
摘要：
Vanadium redox flow batteries (VRFBs) have been regarded as one of the most promising energy storage systems at grid-scale owing to their advantages of safe operation, flexible design, and long cycle life. However, the low electrochemical activities and poor hydrophilicity of conventional carbon-based electrodes (e.g., carbon felt, CF) greatly restrict the further improvements of cell performance and commercial applications. Therefore, fabricating advanced electrodes is crucial to the progress and practical applications of VRFBs. In this work, the waste biomass of peanut shells (PS) is used as the raw material to produce carbon particles that coat on the surface of CF (PS/CF) via adsorption and carbonization procedures. The redox reactions of VO2+/VO2+ are remarkably promoted on the as-prepared PS/CF electrode. When PS/CF is employed as the positive electrode, the resulting VRFB cell shows energy efficiency of 87% over 500 cycles under 100 mA cm−2, which is significantly higher than the pristine CF-based VRFB cell (79%). Additionally, the cycling stability of PS/CF-based cell has been remarkably enhanced. This study demonstrates that the cost-effective and sustainable peanut-shell-derived carbon modified CF holds a broad application prospects in the practical applications of advanced VRFBs as energy storage systems.
摘要：
The SiC/SiBCN composites were prepared via polymer infiltration and pyrolysis (PIP) technique. The structural composition and property evolution behavior of the composites under inert high-temperature environment were investigated to reveal the failure mechanism of the composites. With the increase of the heat treatment temperature from 1500 degrees C to 1600 degrees C, the composite properties underwent a sharp decline. Among them, the weight loss rate gradually increased from 3% to 9% and the density decreased from 2.4 g/cm(3) to 2.3 g/cm(3). Especially, the room temperature flexural strength decreased from 267 +/- 7 MPa to 179 +/- 3 MPa and the strength retention were 46%. The degradation of SiC fiber properties is the main factor for the decrease in flexural strength of the composites at below 1500 degrees C. When heat treatment temperature above 1600 degrees C, the mechanical properties of SiC fiber dramatically decline, and the SiBCN ceramic matrix initially precipitated Si3N4 crystalline phase leading to a carbothermal reduction reaction. Hence, the mechanical properties of the composite at T > 1600 degrees C deteriorate sharply under the influences of the above two negative factors.
摘要：
LSCM perovskite is a promising ceramic cathode for direct CO2 electrolysis in solid oxide electrolysis cells (SOECs), but its application is limited by insufficient catalytic activity and stability. Herein, a novel strategy is proposed to improve electrolysis properties by modifying La0.75Sr0.25Cr0.5Mn0.5O3-delta-Gd0.2Ce0.8O2-delta (LSCM-GDC) backbone with Cu nanocatalyst. The metal-oxide interfaces between Cu NPs and ceramic backbone effectively increase the catalytic active sites and oxygen vacancy concentration, thus facilitating CO2 transport and reduction process. Consequently, Cu decorated cells achieve a peak current density of 1.33 A cm(-2) (2 wt%) at 800 degrees C and 1.5 V, which is 2.5 times that of the bare LSCM-GDC electrode (0.53 A cm(-2)). Similarly, R-p value is considerably decreased by 70% at 800 degrees C from 2.20 omega cm(2) to 0.65 omega cm(2). Overall, decoration with Cu nanocatalyst provides new insights for LSCM based cathodes. Graphical abstract
期刊：
Journal of Electroanalytical Chemistry,2023年928:117063 ISSN：1572-6657
通讯作者：
Daifei Liu
作者机构：
[Chen, Qiaoyun; Liu, Daifei; Tan, Lei; Huang, Xing] Changsha Univ Sci & Technol, Sch Energy & Power Engn, Changsha 410114, Hunan, Peoples R China.;[Chen, Peng; Zou, Kangyu; Li, Lingjun] Changsha Univ Sci & Technol, Sch Mat Sci & Engn, Changsha 410114, Hunan, Peoples R China.
通讯机构：
[Daifei Liu] S;School of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410114, Hunan, China
关键词：
Li metal anode;Li dendrites;Side reactions;LiCl protective layer
摘要：
Li metal anode is a potential candidate for high-energy-density batteries. However, Li dendrites and the side reactions bring challenges to the application of Li metal anode. Herein, a LiCl protective layer is fabricated on the surface of Li metal anode by a facile chemistry process. Attributing to the low Li ion diffusion energy barrier and high stability of LiCl, the Li metal with LiCl layer (LiCl@Li) shows a dendrite-free deposition, forming a robust LiF-riched SEI and effectively suppresses the interfacial side reactions during cycling. The LiCl@Li anode sustains repeated plating/stripping over 500 h with flat overpotential and shows 2.8 times longer lifetime than bare Li anode at a current density of 2 mA cm-2. We believe this work would inspire more opportunities in Li surface engineering and accelerate the development of high-reliability Li metal anode.
摘要：
Directionally solidified gas turbine blades are wildly used in land-based industrial gas turbines for power generation. During long-term service, the harsh service environment causes microstructural and mechanical deterioration of the blades. In order to increase usage and save costs, this study analyzed the microstructure damage in different sections of the blade. Meanwhile, this investigation discussed the optimum rejuvenation heat treatment parameter and applied it to the serviced blade for the lifetime extension. The microstructural analysis indicated that the appropriate solution temperature for the serviced blade is 1205 degrees C. Furthermore, the microstructure of the degraded blade was effectively recovered including the gamma ' dissolution and reprecipitation with the cubic shape, tertiary gamma ' reprecipitation in gamma matrix, part of film-like M23C6 redissolution and dislocation networks were eliminated after rejuvenation heat treatment. In addition, the stress rupture lifetime and the tensile and yield strength were effectively improved by rejuvenation heat treatment.(c) 2023 Elsevier B.V. All rights reserved.
摘要：
A neutral aqueous single‐molecule redox‐targeting (SMRT)‐based Prussian blue (PB)−Fe/S flow battery was demonstrated. Especially, the energy density of a battery based on [Fe(CN)6]3−/4−‐containing catholyte is increased to 92.8 Wh L−1. Moreover, the PB−Fe/S flow battery exhibits outstanding performance with long cycle life over 7000 cycles (4500 h), and the chemical cost of the PB−Fe/S full cell is as low as 19.26 $ kWh−1. Abstract Neutral aqueous flow batteries with common traits of the redox flow batteries, such as the independence of energy and power, scalability and operational flexibility, and additional merits of outstanding safety and low corrosivity show great promise for storing massive electrical energy from solar and wind energy. Particularly, the ferricyanide/ferrocyanide ([Fe(CN)6]3−/4−) couple has been intensively employed as redox mediator to store energy in the catholyte ascribed to its abundance, low corrosivity, remarkable redox reversibility and stability. However, the low energy density arising from poor solubility of [Fe(CN)6]3−/4− restricts their commercial applications for energy storage systems. In this study, the practical energy density of a [Fe(CN)6]3−/4−‐based catholyte is significantly boosted from 10.5 to 92.8 Wh L−1 by combining the counter‐ion effect and the single‐molecule redox‐targeting (SMRT) reactions between [Fe(CN)6]3−/4− and Prussian blue (Fe4[Fe(CN)6]3, PB)/Prussian white (PW). Paired with concentrated K2S anolyte, we demonstrate a neutral aqueous SMRT‐based PB−Fe/S flow battery with ultra‐long lifespan over 7000 cycles (4500 h) and ultra‐low chemical cost of electrolytes in the cell as 19.26 $ kWh−1. Remarkably, under the influences of SMRT reactions in the presence of PB granules in the catholyte, the capacity after 7000 cycles of the PB−Fe/S flow battery is 181.8 % of the initial capacity without PB.
通讯机构：
[Yiqiong Zhang] C;[Hanwen Liu; Shuangyin Wang] S;School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW, 2007 Australia<&wdkj&>School of Chemical Engineering, The University of Queensland, St Lucia, Brisbane, QLD, 4072 Australia<&wdkj&>College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha, 410114 P. R. China<&wdkj&>State Key Laboratory of Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Advanced Catalytic Engineering Research Center of the Ministry of Education, Hunan University, Changsha, 410082 China
关键词：
defects;dynamic;electrocatalysts;evolution
摘要：
This review focuses on the formation and preparation of defects, the dynamic evolution process of defects, and the influence of defect dynamic evolution on catalytic reactions. The summary of the current advances in the dynamic evolution process of defects in oxygen evolution reaction, hydrogen evolution reaction, nitrogen reduction reaction, oxygen reduction reaction, and carbon dioxide reduction reaction, and the given perspectives are expected to provide a more comprehensive understanding of defective electrocatalysts on the structural evolution process during electrocatalysis and the reaction mechanisms, especially for the defect dynamic evolution on the performance in catalytic reactions.
摘要：
Flow batteries (FBs) are one of the most promising strategies for large-scale energy storage, in which the flow rates of electrolytes are critical to the redox reaction efficiency. However, low-power and energy-efficient strategies to effectively monitor and adjust the flow rates of FBs are great challenges. Here, a liquid metal based thin-film and self-powered triboelectric sensor (LM-TS) to monitor and adjust the real-time electrolyte flow rates in FBs is developed. By integrating the LM-TS with a peristaltic pump (flow rate control unit in FB), the flow rates of electrolytes can be converted into readable electrical output signals. Furthermore, a logical and a control module are adopted to adjust the flow rates of electrolytes automatically after receiving those electrical signals, which are available to guarantee the optimal working condition of FBs. Benefiting from the high conductivity and outstanding ductility of ultrathin LM film, the self-powered LM-TS is endowed with high sensitivity, short response time (9.1 ms), and remarkable cyclic stability (> 20000 cycles) without affecting the normal operation of FBs. This is the first prototype of self-powered adjustment sensor for FBs, which is readily extended to scaled-up FB equipment for intermediate trial and large-scale energy-storage demonstration.
期刊：
Journal of Non-Crystalline Solids,2023年614:122407 ISSN：0022-3093
通讯作者：
Wang, YL
作者机构：
[Xiong, Xiang; Wang, Yalei; Wu, Nannan] Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China.;[Liu, Huaifei] Cent South Univ Forestry & Technol, Hunan Prov Key Lab Mat Surface Interface Sci &Tech, Changsha 410004, Peoples R China.;[Wu, Nannan] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410114, Peoples R China.
通讯机构：
[Wang, YL ] C;Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China.
关键词：
pH value;Ytterbium silicate;Cocurrent coprecipitation;Tetraethyl orthosilicate;Hydrolysis and condensation
摘要：
Ytterbium monosilicate (Yb2SiO5) were synthesized by cocurrent coprecipitation method. The precursors were prepared by the hydrolysis and the formation of TEOS with embedding Yb atoms under alkali-catalysis, and then calcined to obtain Yb2SiO5 powders. The effect of the system pH value on the synthesis process of Yb2SiO5 powders was investigated. The results reveal that the system pH value did not significantly influence the crys-talline phase of Yb2SiO5 nanoparticles. However, it is sensitive to the grain size, crystallization temperature and phase transition temperature of Yb2SiO5. The polymerization degree and thermal stability of Yb-O-Si colloidal particles were affected by the system pH value. In range of 7-12, -[Yb-O-Si]-network structure with larger pores and fewer branching networks tended were formed, with the increase of pH value. The crystal size and agglomeration of the synthesized X2-Yb2SiO5 powders were determined by the zeta potential and OH- con- centrationaffecting the stability of Yb-O-Si colloidal particles.
关键词：
Al alloys;Gradient microstructure;Precipitation;Laser remelting;Strength-ductility synergy
摘要：
Titanium (Ti) is generally known for its limited solid solubility and used as grain refiner in Al-based alloys, accelerating heterogeneous alpha-Al nucleation during solidification. In this study, a newly developed surface modification of pure Al followed by sputtering Ti film (similar to 1 mu m) and subsequent laser remelting has been proposed. Gradient structural features in both grain size and chemical composition have been accomplished in the top surface layer (<10 mu m), showing three typical domains with different grain morphology and Al3Ti nanoprecipitates. The simultaneous increase in strength and ductility is attributed to the strong dislocation-precipitate interaction inside gradient nano-grained top-surface layer, which has been confirmed by the partially dissolved Al3Ti nanoprecipitates induced by deformation. The findings in this work provide a new routine for upgrading mechanical properties through the manipulation of both grain- and chemical-gradients.
作者机构：
[Hao, Jiayi; Du, Jinchao; Wu, Chun; Wang, Bixia; Xu, Hui; Qin, Wei] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410114, Peoples R China.;[Ma, Zhen] South China Normal Univ, Sch Chem, Guangzhou 510006, Peoples R China.
通讯机构：
[Zhen Ma; Chun Wu; Wei Qin] A;Authors to whom correspondence should be addressed.<&wdkj&>School of Chemistry, South China Normal University, Guangzhou 510006, China<&wdkj&>Authors to whom correspondence should be addressed.<&wdkj&>College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha 410114, China
关键词：
aqueous zinc ion batteries;electrolyte;solvation structure;water in salt
作者机构：
[Yao, Hong; Yuan, Du; Li, Yuhang; Zhu, Xiaobo; Li, Xin] Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410004, Hunan, Peoples R China.;[Zhao, Jin] Nanjing Univ Posts & Telecommun, State Key Lab Organ Elect & Informat Displays, 9 Wenyuan Rd, Nanjing 210023, Peoples R China.;[Zhao, Jin] Nanjing Univ Posts & Telecommun, Inst Adv Mat IAM, 9 Wenyuan Rd, Nanjing 210023, Peoples R China.;[Zhang, Haitao] Chinese Acad Sci, Inst Proc Engn, Beijing 100190, Peoples R China.;[Zhang, Yizhou] Nanjing Univ Informat Sci & Technol, Inst Adv Mat & Flexible Elect IAMFE, Sch Chem & Mat Sci, Nanjing 210044, Peoples R China.
通讯机构：
[Du Yuan; Du Yuan Du Yuan Du Yuan] C;[Jin Zhao; Madhavi Srinivasan; Jin Zhao Jin Zhao Jin Zhao; Madhavi Srinivasan Madhavi Srinivasan Madhavi Srinivasan] S;[Haitao Zhang; Haitao Zhang Haitao Zhang Haitao Zhang] I;Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190 China<&wdkj&>College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha, Hunan, 410004 P. R. China<&wdkj&>School of Materials Science and Engineering, Nanyang Technological University, Block N4.150 Nanyang Avenue, Singapore, 639798 Singapore<&wdkj&>State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM), Nanjing University of Posts & Telecommunications, 9 Wenyuan Road, Nanjing, 210023 China
关键词：
ionomer;liquid crystal electrolyte;ordering;zinc ion battery;Zn
通讯机构：
[Chen, CS ] C;Changsha Univ Sci & Technol, Coll Mat Sci & Engn, Changsha 410114, Peoples R China.
关键词：
Graphene oxide;Quaternary material;Microwave synthesis;Photocatalytic H 2-production
摘要：
To enhance the photocatalytic H2 production capacity of reduced graphene oxide/CdS/ single crystal ZnO nanorod (RGOCZ) ternary material, Ce-organic framework [UiO66-(Ce)]/ rGO/CdS/single crystal ZnO nanorod (URGOCZ) quaternary material was prepared by microwave-assisted co-precipitation method, and the influence of UiO66-(Ce) content on the photocatalytic performance of quaternary material was analyzed. The experimental study shows that RGOCZ ternary material is anchored in the surface of the UiO66-(Ce), and the photocatalytic H2 evolution capacity of RGOCZ ternary material is enhanced by UiO66(Ce) significantly. When 15 mL UiO66-(Ce) solution (0.4 g/L) is added, the photocatalytic H2 evolution efficiency of 15URGOCZ quaternary material reaches 10.55 mmol g-1 h-1.(c) 2023 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
通讯机构：
[Jinhui Huang] C;College of Environmental Science and Engineering, Hunan University, Changsha, Hunan, 410082, China<&wdkj&>Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha, Hunan, 410082, China
关键词：
3D framework;Biofouling;Electrospun membrane;Membrane bioreactor;Structure enhancing;quorum quenching
摘要：
Bacterial quorum quenching (QQ) is an effective strategy for controlling biofouling in membrane bioreactor (MBR) by interfering the releasing and degradation of signal molecules during quorum sensing (QS) process. However, due to the framework feature of QQ media, the maintenance of QQ activity and the restriction of mass transfer threshold, it has been difficult to design a more stable and better performing structure in a long period of time. In this research, electrospun fiber coated hydrogel QQ beads (QQ-ECHB) were fabricated by using electrospun nanofiber coated hydrogel to strengthen layers of QQ carriers for the first time. The robust porous PVDF 3D nanofiber membrane was coated on the surface of millimeter-scale QQ hydrogel beads. Biocompatible hydrogel entrapping quorum quenching bacteria (sp.BH4) was employed as the core of the QQ-ECHB. In MBR with the addition of QQ-ECHB, the time to reach transmembrane pressure (TMP) of 40 kPa was 4 times longer than conventional MBR. The robust coating and porous microstructure of QQ-ECHB contributed to keeping a lasting QQ activity and stable physical washing effect at a very low dosage (10g beads/5L MBR). Physical stability and environmental-tolerance tests also verified that the carrier can maintain the structural strength and keep the core bacteria stable when suffering long-term cyclic compression and great fluctuations in sewage quality.
