4.7 Article

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

期刊

JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 651, 期 -, 页码 243-253

出版社

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2023.07.178

关键词

Cobalt selenide; Nickel sulfide; Nanosheet arrays; Electrodeposition; Supercapacitors

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In this study, Co0.85Se@Ni3S2 hybrid nanosheet arrays supported on carbon cloth substrate were synthesized through an efficient two-step electrodeposition method. The Co0.85Se@Ni3S2 heterojunction exhibited enriched active sites, improved electrical conductivity, and reduced ion diffusion resistance. The as-synthesized Co0.85Se@Ni3S2 electrode showed high gravimetric and volumetric capacitance, excellent rate capability, and good cycling performance. Additionally, a hybrid supercapacitor device demonstrated a high energy density and cyclic durability.
Rational design of porous heterostructured electrode materials for high-performance supercapacitors remains a big challenge. Herein, we report the in situ synthesis of Co0.85Se@Ni3S2 hybrid nanosheet arrays supported on carbon cloth (CC) substrate though an efficient two-step electrodeposition method. Compared with pure Co0.85Se and Ni3S2, the well-defined Co0.85Se@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 Co0.85Se and Ni3S2, the as-synthesized Co0.85Se@Ni3S2 electrode delivers a gravimetric capacitance (Cg)/volumetric capacitance (Cv) 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.

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