MXenes公司
假电容
碳化钒
钒
电容
碳化物
硫酸
电解质
提龙
水溶液
重量分析
化学
无机化学
碳化钛
化学工程
材料科学
冶金
纳米技术
超级电容器
有机化学
物理化学
酶
工程类
电极
超氧化物
作者
Teng Zhang,Kyle Matthews,Armin VahidMohammadi,Meikang Han,Yury Gogotsi
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2022-10-14
卷期号:7 (11): 3864-3870
被引量:14
标识
DOI:10.1021/acsenergylett.2c01508
摘要
Pseudocapacitive charge storage with Ti3C2Tx in protic electrolytes has received significant attention. However, other MXene compositions have received less attention so far. Additionally, pseudocapacitance of MXenes has only been reported in acidic electrolytes. Herein, we report on the pseudocapacitance of two vanadium carbide MXenes (V2CTx and V4C3Tx) in various basic electrolytes and sulfuric acid, showing distinct redox couples in their cyclic voltammograms. Freestanding V2CTx film electrodes could deliver gravimetric capacitances above 250 F g–1 in different basic electrolytes with the highest capacitance of 386 F g–1 in 1 M LiOH at 2 mV s–1. Moreover, the cycle life performance showed an increasing capacitance over thousands of cycles (121% of initial capacitance after 60,000 cycles at 10 A g–1 in 6 M KOH). Both materials also exhibit higher capacitances than Ti3C2Tx in 3 M sulfuric acid, with 475 and 284 F g–1 for V2CTx and V4C3Tx, respectively.
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