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Elevating the d-Band Center of Ni3S2Nanosheets by Fe Incorporation to Boost the Oxygen Evolution Reaction

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Langmuir 2023年第15期39卷 5375-5383页

作者： Jie Ying Zhen-Zhao He Jiang-Bo Chen Yu-Xuan Xiao Xiao-Yu Yang School of Chemical Engineering and Technology Sun Yat-sen University Zhuhai 519082 China State Key Laboratory Advanced Technology for Materials Synthesis and Processing & School of Materials Science and Engineering & Shenzhen Research Institute & Joint Laboratory for Marine Advanced Materials in Pilot National Laboratory for Marine Science and Technology (Qingdao) Wuhan University of Technology 122 Luoshi Road Wuhan 430070 China

Many attempts have been made to enhance the relatively poor electrochemical activity of Ni3S2 for the oxygen evolution reaction (OER) by elevating the d-band center. Unfortunately, only limited suc...

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Boosting oxygen evolution of LiCoO2 electrocatalysts via lithium defect

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Materials Today Catalysis

materials Today Catalysis 2025年 8卷

作者： Li, Huamei Li, Mengyuan Liao, Lingling Yang, Han Xiang, Kun Luo, Guoqiang Xie, Mingjiang School of Chemistry and Environmental Engineering Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education Wuhan Institute of Technology Wuhan430205 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Hubei Key Lab for Processing and Application of Catalytic Materials College of Chemical Engineering Huanggang Normal University Huanggang438000 China

The challenge of the complex oxygen evolution reaction (OER) currently impedes the efficient production of hydrogen via electrolytic water splitting. To address this issue, the development and improvement of effective electrocatalysts are required. LiCoO2, a key material in lithium-ion batteries, has shown promising potential as an electrocatalyst for electrochemical energy conversion. However, OER catalysts derived from LiCoO2 have faced obstacles such as high overpotential and a complicated preparation process. In this study, the preparation method is adjusted to optimize the synthesis of Li1-xCoO2 with a defective structure, resulting in an impressive overpotential of only 290 mV at a current density of 100 mA cm−2 and a remarkable Tafel slope of 15.2 mV dec−1. The exceptional catalytic activity of Li1-xCoO2 can be attributed to the absence of Li, which triggers oxidative alterations in the electronic structure of Co. Density functional theory (DFT) calculations reveal that Li defects can influence the d-band center of active Co sites, enhancing the adsorption capabilities of Co sites towards *OOH intermediates and increasing the conductivity of the electrocatalyst during the OER process. These alterations improve the velocity of the crucial step in the reaction, ultimately boosting the catalyst's overall performance and efficiency. © 2024 The Authors

关键词： Lithium-ion batteries

Bioinspired mechanically interlocking holey graphene@SiO_(2)anode

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Interdisciplinary materials 2022年第4期1卷 517-525页

作者： Fei Wang Xiaobin Liao Haoyu Wang Yan Zhao Jian Mao Donald G.Truhlar College of Materials Science and Engineering Sichuan UniversityChengduChina State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhanChina School of Materials Science and Engineering University of New South WalesSydneyNew South WalesAustralia The Institute of Technological Sciences Wuhan UniversityWuhanChina Department of Chemistry Chemical Theory CenterMinnesota Supercomputing InstituteUniversity of MinnesotaMinneapolisMinnesotaUSA

Mechanically interlocking structures that can enhance adhesion at the interface and regulate the stress distribution have been widely observed in biological *** by the biological structures in the wings of beetles,we synthesized a holey graphene@SiO_(2)anode with strong mechanical interlocking,characterized it electrochemically,and explained its performance by finite element analysis and density functional calcula*** mechanically interlocking structure enhances lithium-ion(Li^(+))storage by transmitting the strain from SiO_(2)to the holey graphene and by a mechano-electrochemical coupling *** interlocking fit hinders the abscission of SiO_(2)and the distinctive structure reduces the stress and strain of SiO_(2)during(de)*** positive mechano-electrochemical coupling effect preserves the amount of electrochemically active phase(LixSi)during cycles and facilitates Li+***,the capacity shows only a slight attenuation after 8000 cycles(cycling stability),and the specific capacity is~1200 mA h g^(−1)at 5 A/g(rate-performance).This study furnishes a novel way to design high-performance Li^(+)/Na+/K^(+)/Al3^(+)anodes with large volume expansion.

关键词： holey graphene mechanically interlocking mechano-electrochemical coupling effect simulation SiO_(2) anode

Surface-assembled highly flexible Na_(3)(VOPO_(4))_(2)F nanocube cathode for high-rate binder-free Na-ion batteries

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Chinese Chemical Letters 2021年第2期32卷 826-829页

作者： Bohua Deng Ning Yue Haoyang Dong Qiuyue Gui Liang Xiao Jinping Liu School of Chemistry Chemical Engineering and Life ScienceWuhan University of TechnologyWuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology.Wuhan 430070China Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal UniversityHarbin 150025China

Flexible Na-ion storage cathodes are still very few due to the challenge in achieving both reliable mechanical flexibility and excellent electrochemical ***,a new type of flexible Na_(3)(VOPO_(4))_(2)F cathode with nanocubes tightly assembled on carbon cloth is fabricated by a facile solvothe rmal method for the first *** cathode is able to exhibit superior rate capability and stable cycling performa nce up to 1000 cycles,due to the surface-assembling of crystalline nanocubes on carbon *** addition,it shows good mechanical flexibility,nearly no capacity decay is observed after continuous bending of 500 *** this novel cathode and a directly-grown Na_(2)Ti_(2)O_(5) anode,a fully binde r-free Na-ion battery is *** can deliver a high wo rking voltage and increased gravimetric energy/power densities(maximum values:220.2 Wh/kg;5674,7 W/kg),and can power a LED indicator at bending angles fro m 0° to 180°.

关键词： Flexible cathode Na_(3)(VOPO_(4))_(2)F Nanocube Surface-assembling Sodium-ion battery

Simpler and Greener Preparation of An In-Situ Polymerized Polyimide Anode for Lithium Ion Batteries

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SSRN 2023年

作者： Zhang, Qiuyitong Xu, Yuexin Lv, Ning Li, Hanyang Wei, Zijie Tiana, Tian Wang, Yadong Tang, Haolin State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen Valley Foshan528200 China

A simplified and greener procedure for in-situ obtaining polyimide anode materials for lithium-ion battery electrodes is developed. The combined polyimide material synthesis and electrode preparation reduces the number of processing steps and treatment duration and decreases the energy required for heat treatment, solvent evaporation, and organic solvent use. More importantly, polymerization in situ on the electrode surface render the polyimide particles a sea urchin-like structure, leading to fast electrochemical kinetics, and significant improvement in discharge capacity and cycling performance compared with materials obtained using traditional procedures. Specific capacities of 1870 mAh g-1 and 2277 mAh g-1 at 30℃ and 60℃, respectively, are obtained. A capacity of 1774 mAh g-1 is retained after 500 cycles at high current density of 1000 mA g-1 at 60℃. This new preparation process not only simplifies the preparation process and makes it greener, but also significantly improves the battery performance, providing new possibilities for the preparation of high-performance low-cost lithium-ion battery electrodes. © 2023, The Authors. All rights reserved.

关键词： Solvents

Hierarchical Microstructure and Strengthening Mechanism of Haynes 188 Alloy Manufactured by Laser Powder Bed Fusion

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SSRN 2022年

作者： Liu, Yang Huang, Zhifeng Zhang, Chi Lu, Jiaqi Ouyang, Ni Shen, Qiang Chen, Fei State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

Co and Ni superalloys have been widely used in aerospace. Abundant studies have been focused on additive manufacturing of Ni superalloys. However, the equally important Co superalloy has less been fabricated by additive manufacturing. In this work, Haynes 188 alloy, a kind of Co-based superalloy, is fabricated by using laser powder bed fusion. The microstructure and mechanical properties before and after a stress relief treatment of the additive manufactured Haynes 188 alloys are investigated in detail. For as-built alloys without stress relief treatment, the thermodynamic modeling predicts that a phase of M 6 C exists in the specimen, which is confirmed by a TEM EDS mapping result. Arrayed stacking faults, dislocations, and M 6 C precipitations are widely found inside grains of the specimen without stress relief treatment. The yield strength and elongation of the specimen without stress relief treatment are 645 MPa and 57.3%, respectively. For the specimen with stress relief treatment, the dislocation density is reduced, the carbide precipitations are dissolved into the matrix, and stacking faults are arrayed near grain boundaries. As a result, the yield strength slightly decreases to 485 MPa but the elongation increases to 68.1%. The mechanical properties of fabricated Haynes 188 alloys in this work are superior to that of the published Ni or Co superalloys. This work provides an effective method to improve the mechanical properties of Co superalloys by additive manufacturing, which is important for the development of high-performance superalloys and their manufacturing methods. © 2022, The Authors. All rights reserved.

关键词： Superalloys

Enhancing the Combustion Properties of Interface Optimized Metastable Intermixed Composites Pvdf/Μ-Al by Noncovalently Functionalized Graphene

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SSRN 2022年

作者： Shen, Qiang Yi, Zhuoran Deng, Haoyuan Qin, Mei Sun, Yi Luo, Guoqiang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

Energetic metastable intermixed composites (MICs) consisting of polyvinylidene fluoride (PVDF) and fuels aluminum (Al) have the potential to be used as propellants and explosives. Our study introduced SPEEK-modified graphene (SPG) prepared by non-covalent modification of sulfonated poly(ether-ether-ketone) (SPEEK) into PVDF/Al to improve its energy release. The optimized interface generated by the interaction between SO3H groups of SPG layer and CF2 dipoles of PVDF layer integrates graphene onto the surface of PVDF/Al particles. Due to the effect of graphene on the interfacial thermal resistance, the enthalpy of SPG coated PVDF/Al particles is about 1.5 times higher than that of uncoated particles. The existence of SPG improves the heat transfer efficiency of MICs. For comparison, reduced graphene oxide (RGO) has also been introduced as an additive. Graphene is introduced to linearly affect(R2=0.9865) the main oxidation enthalpy by lifting the surface oxidation heat release of the Al core. Therefore, graphene is a new strategy for increasing the energy release rate while improving the energy output. © 2022, The Authors. All rights reserved.

关键词： Graphene

Polyphenol Synergistic Cerium Oxide Surface Engineering Constructed Core-Shell Nanostructures as Antioxidants for Durable and High-Performance Proton Exchange Membrane Fuel Cells

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SSRN 2023年

作者： Tang, Haolin Zhao, Shengqiu Liao, Yucong Wang, Rui Liu, Guoliang Zhang, Haining State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Foshan Xianhu Laboratory The Advanced Energy Science and Technology Guangdong Laboratory Xianhu Hydrogen Valley Foshan528200 China

The chemical degradation of proton exchange membranes (PEMs) suffering from radical attack is a crucial issue in the development of proton exchange membrane fuel cells (PEMFCs), while incorporating cerium oxide (CeO2) nanoparticles (NPs) with regenerative redox properties to eliminate radicals could effectively alleviate degradation. However, the low stability and restricted activity of CeO2 in the PEMFC operating condition and the poor compatibility with PEM due to CeO2 agglomeration stimulate the urgency for structural modulation of CeO2. Herein, polyphenols surface functionalized CeO2 core-shell structure (CeO2@TP) were constructed via assembling oxidation-induced coupling tea polyphenols (TP) on CeO2 NPs. The TP oligomeric shell as a protective layer enhances the stability of CeO2, mitigating radical scavenging activity degradation and improving compatibility with PEMs. Gratifyingly, the phenolic hydroxyl-rich reductive TP oligomeric shell accelerates the regeneration of Ce(IV) to Ce(III), increasing the proportion of Ce(III) and oxygen vacancies on the CeO2 surface, thus boosting antioxidation efficiency. As a result, the CeO2@TP-based PEMs exhibited an OCV decay rate of 0.22 mV h-1, a maximum power density of 1.06 W cm-2, an H2 crossover value of 2.18 mA cm-2, thickness retention (91.1%), and negligible Ce migration after 404 hours of accelerated degradation testing. © 2023, The Authors. All rights reserved.

关键词： Oligomers

Ultrafine Grain Tungsten Heavy Alloys with Excellent Performance Prepared by Spark Plasma Sintering

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Journal of Wuhan University of technology(materials Science) 2020年第2期35卷 393-398页

作者： ZHANG Jingang WANG Weimin JI Wei HE Qianglong WANG Aiyang TAN Lin YANG Kai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Institute of Material Science and EngineeringWuhan University of TechnologyWuhan 430070China

Ultrafine grain tungsten heavy alloys (WHAs) were successfully produced from the nano-crystalline powders using spark plasma *** present study mainly discussed the effects of sintering temperature on the density,microstructure and mechanical properties of the *** relative density of 98.12% was obtained at 1 050 ℃,and the tungsten grain size is about 871 *** 1 000 ℃-1 200 ℃,the mechanical properties of the alloys tend to first rise and then goes *** SPS,the alloy exhibits improved hardness (84.3 HRA at 1 050 ℃) and bending strength (987.16 MPa at 1 100 ℃),due to the ultrafine-grained *** fracture mode after bending tests is mainly characterized as intergranular or intragranular fracture of W grains,interfacial debonding of W grains-binding phase and ductile tearing of binding *** EDS analysis reveals a certain proportion of solid solution between W and Ni-Fe binding *** good mechanical properties of the alloys can be attributed to grain refinement and solid solution strengthening.

关键词： tungsten heavy alloys ultrafine grain nano-crystalline powders solid solution strengthening spark plasma sintering