Facile preparation of Nb2O5 microspheres and their excellent electrochemical performance in aqueous zinc-ion hybrid supercapacitors
Facile preparation of Nb2O5 microspheres and their excellent electrochemical performance in aqueous zinc-ion hybrid supercapacitors
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DOI：
10.1007/s12598-022-02016-y
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发表时间：
2022-05
期刊：
影响因子：
8.8
通讯作者：
Siyao Zhang;Hanxiao Chen;Yi-Xue Xu;Chang-Sheng An;Kaixiong Xiang
中科院分区：
文献类型：
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作者：
Siyao Zhang;Hanxiao Chen;Yi-Xue Xu;Chang-Sheng An;Kaixiong Xiang
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, Nb2O5microspheres (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 Nb2O5microspheres was up to 324 F·g–1when 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 Nb2O5microspheres 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–1was 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 Nb2O5microspheres can be potentially used for the development of the next-generation ZHSCs that exhibit excellent performance.Graphical abstract
