Low Li ion diffusion barrier on low-crystalline FeOOH nanosheets and high performance of energy storage  

作　　者：Jien Li Shuang Luo Congcong Wang Qian Tang Yanwei Wang Xiangyu Han Hao Ran Jing Wan Xiao Gu Xue Wang Chenguo Hu 

机构地区：[1]Department of Applied Physics,State Key Laboratory of Power Transmission Equipment&System Security and New Technology,Chongqing University,Chongqing,400044,China [2]Faculty of Science,Ningbo University,Ningbo,315211,China

出　　处：《Nano Research》2020年第3期759-767,共9页纳米研究（英文版）

基　　金：This work is supported by the National Natural Science Foundation of China(No.51572040);Fundamental Research Funds for the Central Universities(Nos.2019CDXZWL001,2018CDQYWL0046,and 2018CDPTCG0001/22)。

摘　　要：To obtain symmetric supercapacitors(SCs)with high energy density,it is critical to fabricate an electrode with wide potential window and excellent capacitive performance.Herein,by using the strong double hydrolysis reaction between anions and cations,the FeOOH nanosheets on the surface of activated carbon cloth(FeOOH@AC)are prepared through a simple hydrothermal process.The FeOOH@AC electrode exhibits maximum capacitance of 4,090 mF·cm^−2 at wider potential window-1–0 V and 3,250 mF·cm^−2 at 0–1 V versus SCE in 2 M LiNO3 electrolyte.With two pieces of FeOOH@AC electrodes the obtained symmetric SC can operate at the voltage window of 2 V.This FeOOH symmetric SC shows high energy density of 13.261 mWh·cm^−3 at a power density of 14.824 mW·cm^−3 and maintains 4.175 mWh·cm^−3 at a maximum power density of 118.564 mW·cm^−3,as well as excellent charge storage capacity and cyclic stability.Li ion adsorption and diffusion mechanism on the(200)facets of FeOOH are explained by the density functional theory(DFT)calculations.The simple synthesis process and excellent capacitance performance of the FeOOH@AC composite make it a very promising candidate for high performance symmetric SC electrodes.

关 键 词：low-crystalline NANOSHEETS FEOOH density functional theory SUPERCAPACITOR 

分 类 号：O64[理学—物理化学]