Solvothermal-induced construction of ultra-tiny Fe2O3 nanoparticles/graphene hydrogels as binder-free high-capacitance anode for supercapacitors

• 作者: Shun-Hua Jiang Jian Ding Rong-Hua Wang Fu-Yu Chen Jing Sun Ying-Xiong Deng Xin-Lu Li
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2021,（12）
• 所属期刊栏目: ORIGINAL ARTICLES
• 页码范围: 3520-3530
• 页数: 11页
• 语种: 英文

摘要

Three-dimensional (3D) ultra-tiny Fe2O3 nanoparticles/graphene hydrogels were prepared using a facile and efficient solvothermal reaction,by which the phase of iron oxide,particle size and the morphology of hydrogels can be precisely controlled by simply adjusting the solvothermal reaction time.Accordingly,the effect of the microstructures of hydrogels on electrochemical per-formance was systematically studied.It was found that Fe2O3/rGO-50 hydrogels (with a solvothermal reaction time of 50 min) possessed a desirable crystallinity,suit-able particle size,decent porous structure,large specific surface area and high electrical conductivity,thus exhibiting a superior electrochemical performance as bin-der-free anode of supercapacitors:a large potential range of 1.15 V,an ultrahigh specific capacitance of 1090 F·g-1 at a current density of 2 A·g-1 and excellent rate capability(531 F·g-1 at 10 A·g-1).The rational design and system-atic research of electrode materials will provide new lights for the preparation of advanced electrochemical energy storage devices.