Self-propagating fabrication of 3D porous MXene-rGO film electrode for high-performance supercapacitors

• 来源期刊: 能源化学
• 年，卷（期）: 2021,（1）
• 页码范围: 243-250
• 页数: 8页
• 语种: 英文

摘要

2D MXene nanosheets with metallic conductivity and high pseudo-capacitance are promising electrode materials for supercapacitors.Especially,MXene films can be directly used as electrodes for flexible super-capacitors.However,they suffer from sluggish ion transport due to self-restacking,causing limited elec-trochemical performance.Herein,a flexible 3D porous MXene film is fabricated by incorporating graphene oxide(GO)into MXene film followed by self-propagating reduction.The self-propagating process is facile and effective,which can be accomplished in 1.25 s and result in 3D porous framework by releasing sub-stantial gas instantaneously.As the 3D porous structure provides massive ion-accessible active sites and promotes fast ion transport,the MXene-rGO films exhibit superior capacitance and rate performance.With the rGO content of 20％,the MXene-rGO-20 film delivers a high capacitance of 329.9 F g-1 at 5 mV s-1 in 3 M H2S04 electrolyte and remains 260.1 F g-1 at 1,000 mV s-1 as well as good flexibility.Further-more,the initial capacitance is retained above 90％after 40,000 cycles at 100 A g-1,revealing good cycle stability.This work not only provides a high-performance flexible electrode for supercapacitors,but also proposes an efficient and time-saving strategy for constructing 3D structure from 2D materials.