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selenium vacancy-rich and heteroatom-doped CoSe/Mo_(2)CTx MXene prepared using ionic liquid dopants for pH-universal hydrogen evolution and flexible supercapacitors

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Journal of Energy Chemistry 2022年第9期31卷 453-464,I0013页

作者： Mingjie Yi Shunyou Hu Na Li Hao Wang Jiaheng Zhang State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyShenzhen 518055GuangdongChina Research Centre of Printed Flexible Electronics School of Materials Science and EngineeringHarbin Institute of TechnologyShenzhen 518055GuangdongChina

vacancy engineering is a useful methodology in the development of catalysts and electrode ***,we report the introduction of Se-vacancy pairs in heteroatom-doped(N,B,and F)CoSe/Mo_(2)CT_(x) MXene(NBF-CoSe/Mo_(2)CT_(x))to enhance the hydrogen evolution reaction(HER)and supercapacitor activities via an ionic liquid-mediated *** vacancy pairs and heteroatom doping enable the reallocation of local electron states and add active sites,improving the electrochemical activity of NBF-CoSe/Mo_(2)CT_(x) with high HER activities over a broad range of *** a current density of 10 mA cm^(-2),overvoltages of 70 and 81 mV are respectively produced in 0.5 M H_(2)SO_(4)and 1 M *** optimal structure also exhibits outstanding electrochemical performance in an asymmetric supercapacitor with an energy density of 34.2 Wh kg^(-1)at a power density of 15989.6Wkg^(-1).This study opens new avenues for the introduction of Se vacancies and heteroatom doping to improve the application performance.

关键词： Flexible supercapacitors,Heteroatom-doped CoSe Hydrogen evolution reaction Ionic liquids selenium vacancy

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Quantitative defect regulation of heterostructures for sulfur catalysis toward fast and long lifespan lithium-sulfur batteries

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Nano Research 2022年第9期15卷 7925-7932页

作者： Saisai Qiu Xinqi Liang Shuwen Niu Qingguo Chen Gongming Wang Minghua Chen Key Laboratory of Engineering Dielectric and Applications(Ministry of Education) School of Electrical and Electronic EngineeringHarbin University of Science and TechnologyHarbin 150080China Hefei National Laboratory for Physical Science at the Microscale Department of ChemistryUniversity of Science&Technology of ChinaHefei 230026China

The advancement of lithium-sulfur(Li-S)batteries is severely retarded by lithium polysulfides(LiPSs)shuttling behavior and sluggish redox ***,the heterogeneous composite with defective Bi_(2)Se_(3−x)nanosheets and porous nitrogen-doped carbon(Bi_(2)Se_(3−x)/NC)is prepared by selenizing bismuth metal-organic frameworks as a multifunctional sulfur *** highly efficient immobilization-conversion on LiPSs is realized by the synergistic effect of structure construction strategy and defect *** is found that Bi_(2)Se_(3−x)with the suitable amount of selenium vacancies achieves the best electrochemical performance due to the advantages of its structure and *** results confirm the intrinsic correlation between defects and catalysis,which are revealed by computational and experimental *** to these superiorities,the developed sulfur electrodes exhibited admirable stability and a fairly lower capacity decay rate of approximately 0.0278%per cycle over 1,000 cycles at a 3 C *** at the high sulfur loading of 6.2 mg·cm^(−2),the cathode still demonstrates a high discharge capacity of 455 mAh·g^(−1)at 1 *** work may enlighten the development of mechanism investigation and design principles regarding sulfur catalysis toward high-performance Li-S batteries.

关键词： lithium-sulfur(Li-S)batteries lithium polysulfides(LiPSs) shuttle effect redox kinetics selenium vacancy sulfur catalysis

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