假电容
插层(化学)
电解质
氧化还原
氧化态
MXenes公司
无机化学
材料科学
化学工程
X射线光电子能谱
化学
超级电容器
金属
电化学
冶金
纳米技术
电极
物理化学
工程类
作者
Xuehang Wang,Seong‐Min Bak,Meikang Han,Christopher E. Shuck,Conlan McHugh,Ke Li,Jianmin Li,Jun Tang,Yury Gogotsi
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2021-11-24
卷期号:7 (1): 30-35
被引量:60
标识
DOI:10.1021/acsenergylett.1c02262
摘要
Achieving pseudocapacitive intercalation in MXenes with neutral aqueous electrolytes and driving reversible redox reactions is scientifically appealing and practically useful. Here, we report that the partial oxidation of MXene intensifies pseudocapacitive Li+ intercalation into Ti3C2Tx MXene from neutral water-in-salt electrolytes. An in situ X-ray absorption near-edge structure analysis shows that the Ti oxidation state changes during the Li+ intercalation, indicating the presence of a surface redox reaction. The Ti oxidation/reduction is further confirmed by an in situ extended X-ray absorption fine structure analysis, which shows a reversible contraction/expansion of the Ti–C interatomic distance. The intensified Li+ pseudocapacitive intercalation can be explained by the higher oxidation state of Ti at the open circuit potential. This work demonstrates the possibility of tuning the pseudocapacitive intercalation by adjusting the initial oxidation state of the transition metal on the MXene and offers a facile way to enhance the pseudocapacitance of various MXenes.
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