In Situ Growth of 3D Hierarchical ZnO@Ni_xCo_(1-x)(OH)_y Core/Shell Nanowire/Nanosheet Arrays on Ni Foam for High-Performance Aqueous Hybrid Supercapacitors  

作　　者：Fumin Wang Mengchao Liu Xubin Zhang Guojun Lv Mingshuai Sun 

机构地区：[1]School of Chemical Engineering and Technology,Tianjin University

出　　处：《Transactions of Tianjin University》2018年第3期201-211,共11页天津大学学报（英文版）

基　　金：supported by the National Basic Research Program of China ("973" Program, No. 2012CB720302);the National Key Research and Development Program of China (No 2016YFF0102503)

摘　　要：In this study, we designed and synthesized a novel battery-type electrode featuring three-dimensional(3D) hierarchical ZnO@Ni_xCo_(1-x)(OH)_y core/shell nanowire/nanosheet arrays arranged on Nifoam substrate via a two-step protocol including a wet chemical process followed by electro-deposition. We then characterized its composition, structure and surface morphology by X-ray diff raction, energy-dispersive X-ray spectrometry(EDS), X-ray photoelectron spectroscopy, scanning electron microscopy(SEM), transmission electron microscopy, EDS elemental mapping. Our electrochemical measurements show that the ZnO@Ni_(0.67)Co_(0.33)(OH)_y electrode material exhibited a noticeably high specific capacity of as much as 255(mA ·h)/g at 1 A/g. Additionally, it demonstrated a superior rate capability, as well as an excellent cycling stability with 81.6% capacity retention over 2000 cycles at 5 A/g. This sample delivered a high energy density of 64 W·h/kg and a power density of 250 W/kg at a current density of 1 A/g. With such remarkable electrochemical properties, we expect the 3D hierarchical hybrid electrode material presented in this work to have promising applications for the next generation of energy storage systems.In this study, we designed and synthesized a novel battery-type electrode featuring three-dimensional（3D） hierarchical ZnO@NixCo1-x（OH）y core/shell nanowire/nanosheet arrays arranged on Nifoam substrate via a two-step protocol including a wet chemical process followed by electro-deposition. We then characterized its composition, structure and surface morphology by X-ray diff raction, energy-dispersive X-ray spectrometry（EDS）, X-ray photoelectron spectroscopy, scanning electron microscopy（SEM）, transmission electron microscopy, EDS elemental mapping. Our electrochemical measurements show that the ZnO@Ni（0.67）Co（0.33）（OH）y electrode material exhibited a noticeably high specific capacity of as much as 255（mA ·h）/g at 1 A/g. Additionally, it demonstrated a superior rate capability, as well as an excellent cycling stability with 81.6% capacity retention over 2000 cycles at 5 A/g. This sample delivered a high energy density of 64 W·h/kg and a power density of 250 W/kg at a current density of 1 A/g. With such remarkable electrochemical properties, we expect the 3D hierarchical hybrid electrode material presented in this work to have promising applications for the next generation of energy storage systems.

关 键 词：ZnO@NixCo1-x（OH）y Core/shell nanowire/nanosheet array Supercapacitor Ni foam 

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]