The aqueous solution-based zinc-ion hybrid supercapacitors(ZHSCs)have attracted immense attention as they are characterized by high power and energy den-sities.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,Nb2O5 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 Nb2O5 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.Nb2O5//AC ZHSCs were fabricated with Nb2O5 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 Nb2O5 microspheres can be poten-tially used for the development of the next-generation ZHSCs that exhibit excellent performance.

School of Materials and Advanced Manufacturing,Liling Ceramic Institute,Hunan University of Technology,Zhuzhou 412007,China;Hunan Key Laboratory of Applied Environmental Photocatalysis,Changsha University,Changsha 410022,China;Hunan Institute of Science and Technology,Yueyang 414000,China

[1]Si-Jia Zhang;Han Chen;Yi-Xue Xu;Chang-Sheng An;Kai-Xiong Xiang-.Facile preparation of Nb2O5 microspheres and their excellent electrochemical performance in aqueous zinc-ion hybrid supercapacitors)[J].稀有金属（英文版）,2022(09):3129-3141

dumplings,stuffing

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