RT Journal Article A1 Zhenjiang Li,Jun Dai,Yiran Li,Changlong Sun,Alan Meng,Renfei Cheng,Jian Zhao,Minmin Hu,Xiaohui Wang; AD 材料科学工程学院, 中国 ; 机电工程学院, 中国 ; Department of Mechanical Engineering, 中国 ; 材料科学工程学院, 中国 ; 生态化工国家重点实验室培育基地, 中国 ; 沈阳材料科学国家实验室, 中国 ; 材料科学工程学院, 中国 ; 材料科学工程学院, 中国 ; 沈阳材料科学国家实验室, 中国 T1 Intercalation−deintercalation design in MXenes for high-performance supercapacitors YR 2022 IS 4 vo 15 OP 3213-OP 3221 K1 energy storage;MXene;supercapacitor;electrochemical ion intercalation−deintercalation;interlayer design AB 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. SN 1998-0124 LA EN