Two-dimensional porous zinc cobalt sulfide nanosheet arrays with superior electrochemical performance for supercapatteries  

作　　者：Yang Li Ziyang Luo Shunfei Liang Huizhen Qin Xun Zhao Lingyun Chen Huayu Wang Shaowei Chen 

机构地区：[1]School of Chemistry and Chemical Engineering,Chongqing University,Chongqing 400044,China [2]Department of Chemistry and Biochemistry,University of California,Santa Cruz,California 95060,United States

出　　处：《Journal of Materials Science & Technology》2021年第30期199-208,共10页材料科学技术（英文版）

基　　金：financial support from the National Natural Science Foundation of China(Nos.21101176 and 21676036);the Fundamental Research Funds for the Central Universities of Chongqing University(Nos.2018CDQYCH0028,2018CDXYHG0028 and 2019CDXYHG0013);the Graduate Research and Innovation Foundation of Chongqing(No.CYS-20040);the Large-scale Equipment Sharing Fund of Chongqing University(Nos.201903150149 and 202003150020)。

摘　　要：Unique two-dimensional(2D)porous nanosheets with overwhelmingly rich channels and large specific surface area exhibit superior electrochemical capacitance performance,as compared to the conventional zero-and one-dimensional counterparts.As ternary transition metal sulfides(TMSs)are well recognized for their high electrochemical activity and capacity,and the replacement of oxygen with sulfur may result in high stability and flexible properties of the nanomaterials,as compared to transition metal oxides,herein we report the synthesis of 2D porous nanosheet arrays of Zn_(x)Co_(1-x)S(x=0,0.25,0.5,0.75,and 1)via a facile hydrothermal process.Due to the synergistic effect of the metal components and a unique 2D porous structure,the Zn_(0.5)Co_(0.5)S electrode was found to stand out as the best among the series,with a high specific capacity of 614 C g^(-1)at 1 A g^(-1)and excellent cycle retention rate of 90%over 10,000 cycles at 10 A g^(-1).Notably,a supercapattery based on a Zn_(0.5)Co_(0.5)S positive electrode and an activated carbon(AC)negative electrode(Zn_(0.5)Co_(0.5)S//AC)was found to display a 1.6 V voltage window,a 61 mA h g^(-1)specific capacity at 1 A g^(-1),a 49 Wh kg^(-1)energy density at 957 W kg^(-1)power density,and excellent cycling performance(88%over 10,000 cycles),suggesting tremendous potential of Zn_(0.5)Co_(0.5)S in the development of high-performance supercapattery devices.

关 键 词：Two-dimensional materials Porous nanosheet Zinc cobalt sulfide Supercapattery Electrochemical energy storage 

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