超级电容器
插层(化学)
MXenes公司
电解质
电化学
电容
材料科学
电极
氧化还原
化学工程
无机化学
纳米技术
化学
物理化学
工程类
作者
Zhenjiang Li,Jun Dai,Yiran Li,Changlong Sun,Alan Meng,Renfei Cheng,Jian Zhao,Minmin Hu,Xiaohui Wang
出处
期刊:Nano Research
[Springer Nature]
日期:2021-11-22
卷期号:15 (4): 3213-3221
被引量:23
标识
DOI:10.1007/s12274-021-3939-1
摘要
MXene is a new intercalation pseudocapacitive electrode material for supercapacitor application. Intensifying fast ion diffusion is significantly essential for MXene to achieve excellent electrochemical performance. The expansion of interlayer void by traditional spontaneous species intercalation always leads to a slight increase in capacitance due to the existence of species sacrificing the smooth diffusion of electrolyte ions. Herein, an effective intercalation-deintercalation interlayer design strategy is proposed to help MXene achieve higher capacitance. Electrochemical cation intercalation leads to the expansion of interlayer space. After electrochemical cation extraction, intercalated cations are deintercalated mostly, leaving a small number of cations trapped in the interlayer silt and serving as pillars to maintain the interlayer space, offering an open, unobstructed interlayer space for better ion migration and storage. Also, a preferred surface with more -O terminations for redox reaction is created due to the reaction between cations and -OH terminations. As a result, the processed MXene delivers a much improved capacitance compared to that of the original Ti3C2Tx electrode (T stands for the surface termination groups, such as -OH, -F, and -O). This study demonstrates an improvement of electrochemical performance of MXene electrodes by controlling the interlayer structure and surface chemistry.
科研通智能强力驱动
Strongly Powered by AbleSci AI