Novel 2D/2D NiCo_(2)O_(4)/ZnCo_(2)O_(4)@rGO/CNTs self-supporting composite electrode with high hydroxyl ion adsorption capacity for asymmetric supercapacitor  

作　　者：Xiumei Chen Na Xin Yuxin Li Cong Sun Longhua Li Yulong Ying Weidong Shi Yu Liu 

机构地区：[1]School of Chemistry and Chemical Engineering,Jiangsu University,Zhenjiang 212013,China [2]School of Materials Science and Engineering,Zhejiang Sci-Tech University,Hangzhou 310018,China

出　　处：《Journal of Materials Science & Technology》2022年第32期236-244,共9页材料科学技术（英文版）

基　　金：the Innovation Entrepreneurship Program of Jiangsu Province(Suren caiban[2016]32);the National Natural Science Foundation of China(No.21878129);the Industry Prospect and Key Core Technology(Competition Project)of Jiangsu Province(No.BE2019093);the Science Foundation of Zhejiang Sci-Tech University(ZSTU)(No.11112932612101)。

摘　　要：The energy storage device has been urgently studied and developed to meet the increasing demand for energy and sustainable development.Due to the excellent conductivity of graphene and high performance of ZnCo_(2)O_(4)and NiCo_(2)O_(4),we design a self-supporting electrode based on vertically grown twodimensional/two-dimensional(2D/2D)NiCo_(2)O_(4)/ZnCo_(2)O_(4)hierarchical flakes on the carbon-based conductive substrate(NiCo_(2)O_(4)/ZnCo_(2)O_(4)@graphene/carbon nanotubes,NZ@GC).The density functional theory calculations indicate that the high OH-adsorption capacity of the NiCo_(2)O_(4)/ZnCo_(2)O_(4)nanosheets can significantly enhance the electrochemical reaction activity.NZ@GC shows a high capacitance of 1128.6 F g^(-1)at 1 A g^(-1).The capacitance retains 84.0%after 6000 cycles even at 10 A g^(-1).A hybrid supercapacitor is fabricated using NZ@GC and activated carbon,exhibiting a large energy density of 50.8 W h kg^(-1)at the power density of 800 W kg^(-1).After 9000 charge/discharge cycles,the supercapacitor still has 86.1%capacitance retention.The NZ@GC film has showed the potential as promising electrodes in high efficiency electrochemical energy storage devices.

关 键 词：Supercapacitor ZnCo2O4 NiCo2O4 Energy density Excellent conductivity High capacitance 

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]