Facile preparation of Nb_(2)O_(5) microspheres and their excellent electrochemical performance in aqueous zinc-ion hybrid supercapacitors

作     者：Si-Jia Zhang Han Chen Yi-Xue Xu Chang-Sheng An Kai-Xiong Xiang Si-Jia Zhang;Han Chen;Yi-Xue Xu;Chang-Sheng An;Kai-Xiong Xiang

作者机构：School of Materials and Advanced ManufacturingLiling Ceramic InstituteHunan University of TechnologyZhuzhou412007China Hunan Institute of Science and TechnologyYueyang414000China Hunan Key Laboratory of Applied Environmental PhotocatalysisChangsha UniversityChangsha410022China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2022年第41卷第9期

页      面：3129-3141页

核心收录：

学科分类：081702[工学-化学工艺] 080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51972108 and 51772090) China Postdoctoral Science Foundation(No.2021M693777) the Natural Science Foundation of Hunan Province(No.2020JJ4272) the Education Department of Hunan Province(No.19C0576)。 

主　　题：Hydrothermal Microspheres Nb_(2)O_(5) Zincion hybrid supercapacitors(ZHSCs) Fast kinetics 

摘      要：The aqueous solution-based zinc-ion hybrid supercapacitors(ZHSCs)have attracted immense attention as they are characterized by high power and energy densities.Electrode materials with high performance should be developed for ZHSCs to resolve power imbalances between capacitor-and battery-type electrode materials.To address this issue,Nb_(2)O_(5) microspheres(with the structure like sweet dumplings with exposed stuffing)were produced following a hydrothermal process which was followed by a high-temperature calcination process.The specific capacity of the as-synthesized Nb_(2)O_(5) microspheres was up to 324 F·g^(-1) when the current density was 0.1 A·g^(-1),and the long-term capacity retention was 85%at the end of 5000 cycles.The results revealed that the nanospheres could be used as battery-type electrode materials for the fabrication of ZHSCs.Nb_(2)O_(5)//AC ZHSCs were fabricated with Nb_(2)O_(5) microspheres as the negative electrode materials,and activated carbon(AC)was used as the positive electrode material.As a result,a specific capacity of 108 F·g^(-1) was achieved when the current density was 0.1 A·g^(-1).The power density was high(8020 W·kg^(-1))at 28 Wh·kg^(-1),and the energy density was high(60 Wh·kg^(-1))at 100 W·kg^(-1).The structurally novel Nb_(2)O_(5) microspheres can be potentially used for the development of the next-generation ZHSCs that exhibit excellent performance.