Vanadium pentoxide nanosheets with rich oxygen vacancies as a high-performance electrode for supercapacitors

被引：0
作者：
Shiling Zhu
Susu Chen
Hao Zhang
Wenxing Yu
Yuanhao Tian
Xiaolin Hu
Shahid Hussain
Liyang Lin
Wei Chen
Chaohe Xu
机构：
[1] Chongqing University,College of Aerospace Engineering
[2] Jiangsu University,School of Materials Science and Engineering
[3] Chongqing Key Laboratory of Green Aviation Energy and Power,School of Aeronautics
[4] The Green Aerotechnics Research Institute of Chongqing Jiaotong University,undefined
[5] Chongqing Jiaotong University,undefined
来源：
Ionics | 2022年 / 28卷
关键词：
Oxygen vacancies; V; O; Electrochemical; Electrode material;
D O I：
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中图分类号：
学科分类号：
摘要：
Vanadium pentoxide (V2O5), as a common supercapacitor electrode material, has unsatisfactory electrochemical performance due to its low conductivity and ionic diffusion rate, especially its specific capacitance and rate capability, which limits its practical use. In this work, V2O5 rich in oxygen vacancies is successfully prepared by a controllable two-step reduction method. A variety of advanced characterization techniques, especially X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) spectra, have been used to qualitatively monitor changes in oxygen vacancy content. Compared with the untreated hydrated V2O5 nanosheets, the oxygen vacancy V2O5 (Vö V2O5) has a larger specific surface area (4.002 m2 g−1); besides, its specific capacitance (619.5 F g−1 in 1 A g−1) being not only better than that of V2O5 without oxygen vacancy treatment (308.0 F g−1 in 1 A g−1) but also its cycle stability being improved (70.7% capacity retention after 1000 cycles), it is possible to develop high-performance supercapacitors by using it as an electrode material.
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页码：2931 / 2942
页数：11
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