超级电容器
电化学储能
插层(化学)
电化学
储能
原位
材料科学
表面改性
电化学能量转换
纳米技术
化学工程
电极
化学
工程类
无机化学
物理
功率(物理)
有机化学
物理化学
量子力学
作者
Zhiyu Li,Mingyue Jiang,Fangfei Wu,Lili Wu,Xitian Zhang,Lu Li
标识
DOI:10.1016/j.est.2024.110772
摘要
Ti3C2Tx MXene with unique physicochemical properties is a promising negative electrode for high performance supercapacitors, but its full potential for energy storage is limited by inherent restacking and unfavorable F surface termination. Here, a synergistic in-situ intercalation and surface modification strategy for enhancing the electrochemical performance of Ti3C2Tx is demonstrated. Ag nanoparticles were intercalated into the interplanar s of Ti3C2Tx using an in-situ reduction method to open ion diffusion channels and expose active sites, followed by annealing treatment to remove the deleterious termination. Benefitting from the structural modification, the obtained a-Ag/Ti3C2Tx film electrode possess an enhanced specific capacitance of 471 F g−1 at 1 A g−1 with a 2-fold increase in intercalation pseudocapacitance compared to the pristine Ti3C2Tx, accompanied by improved rate performance and cyclic stability. Furthermore, the asymmetric supercapacitor with a negative electrode of a-Ag/Ti3C2Tx and a positive electrode of RuO2@CC delivers a high energy density of 24.6 Wh kg−1. The present study demonstrates an effective strategy to improve the electrochemical energy storage of the Ti3C2Tx negative electrode by designing the intercalation and termination.
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