五氧化二铁
钒
超级电容器
材料科学
X射线光电子能谱
电容
电化学
氧气
电极
电子顺磁共振
空位缺陷
化学工程
分析化学(期刊)
化学
核磁共振
物理化学
冶金
结晶学
有机化学
工程类
物理
色谱法
作者
Shiling Zhu,Susu Chen,Hao Zhang,Wenxing Yu,Yuanhao Tian,Xiaolin Hu,Shahid Hussain,Liyang Lin,Wei Chen,Chaohe Xu
出处
期刊:Ionics
[Springer Nature]
日期:2022-03-31
卷期号:28 (6): 2931-2942
被引量:12
标识
DOI:10.1007/s11581-022-04541-3
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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