Hollow polyhedron structure of amorphous Ni-Co-S/Co(OH)_(2) for high performance supercapacitors  

作　　者：Xixi Zhang Guangmeng Qu Zonghua Wang Guotao Xiang Shuhua Hao Xiaoke Wang Xijin Xu Wenxuan Ma Gang Zhao 

机构地区：[1]School of Physics and Technology,University of Jinan,Ji’nan 250022,China

出　　处：《Chinese Chemical Letters》2021年第8期2453-2458,共6页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos.51802177,51672109);the Independent Cultivation Program of Innovation Team of Ji’nan City (No.2019GXRC011)。

摘　　要：In power storage technology,ion exchange is widely used to modify the electronic structures of electrode materials to stimulate their electrochemical properties.Here,we proposed a multistep ion exchange(cation exchange and anion exchange) strategy to synthesize amorphous Ni-Co-S and β-Co(OH)_(2) hybrid nanomaterials with a hollow polyhedron structures.The synergistic effects of different components and the remarkable superiorities of hollow structure endow Ni-Co-S/Co(OH)_(2) electrode with outstanding electrochemical performance,including ultra-high specific capacity(1440.0 C/g at 1 A/g),superior capacitance retention rate(79.1% retention at 20 A/g) and long operating lifespan(81.4% retention after5000 cycles).Moreover,the corresponding hybrid supercapacitor enjoys a high energy density of 58.4 Wh/kg at the power density of 0.8 kW/kg,and a decent cyclability that the capacitances are maintained at80.8% compared with the initial capacitance.This research presents a high-performance electrode material and provides a promising route for the construction of electrode materials for supercapacitors with both structural and component advantages.

关 键 词：Ion exchange AMORPHOUS β-Co(OH)2 Hollow polyhedron SUPERCAPACITOR 

分 类 号：TM53[电气工程—电器] TB383.1[一般工业技术—材料科学与工程]