In-situ electrodeposited Co0.85Se@Ni3S2 heterojunction with enhanced performance for supercapacitors

Liu Wan; Dianyu Jiang; Yuqi Wang; Yan Zhang; Cheng Du; Mingjiang Xie; Jian Chen

doi:10.1016/j.jcis.2023.07.178

In-situ electrodeposited Co_0.85Se@Ni₃S₂ heterojunction with enhanced performance for supercapacitors

J Colloid Interface Sci. 2023 Dec:651:243-253. doi: 10.1016/j.jcis.2023.07.178. Epub 2023 Jul 29.

Authors

Liu Wan¹, Dianyu Jiang², Yuqi Wang², Yan Zhang², Cheng Du², Mingjiang Xie², Jian Chen³

Affiliations

¹ Hubei Key Lab for Processing and Application of Catalytic Materials, College of Chemical Engineering, Huanggang Normal University, Huanggang 437000, China. Electronic address: wanliuok2006@163.com.
² Hubei Key Lab for Processing and Application of Catalytic Materials, College of Chemical Engineering, Huanggang Normal University, Huanggang 437000, China.
³ Hubei Key Lab for Processing and Application of Catalytic Materials, College of Chemical Engineering, Huanggang Normal University, Huanggang 437000, China. Electronic address: chenjian@hgnu.edu.cn.

PMID: 37542899
DOI: 10.1016/j.jcis.2023.07.178

Abstract

Rational design of porous heterostructured electrode materials for high-performance supercapacitors remains a big challenge. Herein, we report the in situ synthesis of Co_0.85Se@Ni₃S₂ hybrid nanosheet arrays supported on carbon cloth (CC) substrate though an efficient two-step electrodeposition method. Compared with pure Co_0.85Se and Ni₃S₂, the well-defined Co_0.85Se@Ni₃S₂ heterojunction possesses enriched active sites, improved electrical conductivity, and reduced ion diffusion resistance. Benefiting from its hierarchically porous nanostructure and the synergistic effect of Co_0.85Se and Ni₃S₂, the as-synthesized Co_0.85Se@Ni₃S₂ electrode delivers a gravimetric capacitance (C_g)/volumetric capacitance (C_v) of 1644.1F g^-1/3161.7F cm^-3 at 1 A g^-1, outstanding rate capability of 60.7% capacitance retention at 20 A g^-1, as well as good cycling performance of 87.8% capacitance retention after 5000 cycles. Additionally, a hybrid supercapacitor (HSC) device presents a maximum energy density (E) of 65.7 Wh kg^-1 at 696.2 W kg^-1 with 93.3% cyclic durability after 15,000 cycles. Thus, this work proposes a simple and effective strategy to fabricate porous heterojunctions as high-performance electrode materials for energy storage devices.

Keywords: Cobalt selenide; Electrodeposition; Nanosheet arrays; Nickel sulfide; Supercapacitors.