MXenes公司
插层(化学)
假电容
材料科学
电解质
超级电容器
储能
循环伏安法
电化学
氢气储存
化学工程
化学物理
无机化学
纳米技术
复合材料
热力学
合金
化学
物理化学
电极
功率(物理)
工程类
物理
作者
Xinpeng Mu,Dashuai Wang,Fei Du,Gang Chen,Chunzhong Wang,Yingjin Wei,Yury Gogotsi,Yu Gao,Yohan Dall’Agnese
标识
DOI:10.1002/adfm.201902953
摘要
Abstract Since the discovery of Ti 3 C 2 T x in 2011, the family of two‐dimensional transition metal carbides, carbonitrides, and nitrides (collectively known as MXenes) has quickly attracted the attention of those developing energy storage applications such as electrodes for supercapacitors with acidic aqueous electrolytes. The excellent performance of these MXenes is attributed to a pseudocapacitive energy storage mechanism, based on the non‐rectangular shape of cyclic voltammetry curves and changes in the titanium oxidation state detected by in situ X‐ray absorption spectroscopy. However, the pseudocapacitive mechanism is not well understood and no dimensional changes due to proton insertion have been reported. In this work, in situ X‐ray diffraction and density functional theory are used to investigate the charge storage mechanism of Ti 3 C 2 T x in 1 m H 2 SO 4 . Results reveal that a 0.5 Å expansion and shrinkage of the c ‐lattice parameter of Ti 3 C 2 T x occur during cycling in a 0.9 V voltage window, showing that the charge storage mechanism is intercalation pseudocapacitance with implication for MXene use in energy storage and electrochemical actuators.
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