In Situ Construction of ZnO/Ni2S3 Composite on Ni Foam by Combing Potentiostatic Deposition with Cyclic Voltammetric Electrodeposition.

Sa Lv,Chao Wang,Fan Yang,Xiaotian Yang,Peiyu Geng,Huan Wang,Jia Yang,Yaodan Chi

doi:10.3390/mi12070829

Abstract

The ZnO/Ni2S3 composite has been designed and in situ synthesized on Ni foam substrate by two steps of electrodeposition. ZnO was achieved on Ni foam by a traditional potentiostatic deposition, followed by cyclic voltammetric (CV) electrodeposition, to generate Ni2S3, where the introduction of ZnO provides abundant active sites for the subsequent Ni2S3 electrodeposition. The amount of deposit during CV electrodeposition can be adjusted by setting the number of sweep segment and scan rate, and the electrochemical characteristics of the products can be readily optimized. The synergistic effect between the ZnO as backbones and the deposited Ni2S3 as the shell enhances the electrochemical properties of the sample significantly, including a highly specific capacitance of 2.19 F cm−2 at 2 mA cm−2, good coulombic efficiency of 98%, and long-term cyclic stability at 82.35% (4000 cycles).

Highlights

As an important energy storage device, the supercapacitor has attracted more and more attention by virtue of the advantages of its fast charging speed, long cycle life, large current discharge capacity, high power density, and friendly environment [1]
The ZnO/Ni2 S3 composite is synthesized on Ni foam substrate by a two-step elec3
ZnO nanosheets on the surface of Ni foam

Summary

Introduction

As an important energy storage device, the supercapacitor has attracted more and more attention by virtue of the advantages of its fast charging speed, long cycle life, large current discharge capacity, high power density, and friendly environment [1]. The first is to exploit different preparation methods, such as hydrothermal reaction, electrodeposition technique, and in situ polymerization processes It includes the selection of different electrode substrates, such as Ni foam, Cu foam, and carbon cloth, to directly control the structure and morphology of the electrode materials [4]. The component without capacitance characteristics acts as an effective additive ingredient to increase the conductivity, or as a backbone to provide sufficient surface area for the recombination of other components. He et al fabricated CuO@Ni–Fe-layered double hydroxide (LDH) nanorods arrays on Cu foam, by two-step in situ electrochemical processes. The CuO nanorods provide support for the subsequent electrodeposition of

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Conclusion