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Double-layer cobalt selenide/nickel selenide with web-like nanostructures as a high-performance electrode material for supercapacitors

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Title
Double-layer cobalt selenide/nickel selenide with web-like nanostructures as a high-performance electrode material for supercapacitors
Author(s)
Young-Hoon Lee; Jin Soo Kang; Jo, In-Rok; Yung-Eun Sung; Ahn, Kwang-Soon
Publication Date
2021-08-15
Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY, v.895
Publisher
Elsevier B.V.
Abstract
© 2021 Elsevier B.V.In this study, we report the development of a double-layer CoSe2/NiSe2 film as a high-performance electrode material for supercapacitors. CoSe2/NiSe2 film with a distinctive web-like morphology and large surface area was prepared via two-step sequential electrodeposition of CoSe2 and NiSe2 on a nickel foam. The web-like nanostructure provided interconnected pathways that facilitated charge transport and improved ion-diffusion kinetics near the electrode surface. The favorable morphology and combined redox reactions of CoSe2 and NiSe2 in the double-layer CoSe2/NiSe2 electrode resulted in a synergistically enhanced performance in supercapacitors than those of single-layer CoSe2 and NiSe2, exhibiting a high specific capacity of 646 C g−1 at an operation current of 1 A g−1, outstanding rate capability (68.1% capacity retention at 40-times faster charge/discharge), and decent cycling stability (80.1% capacity retention after 5000 cycles at 40 A g−1). The two-electrode hybrid supercapacitors of CoSe2/NiSe2//activated carbon exhibited maximum energy density (27.8 Wh kg−1) at a power density of 750 W kg−1.
URI
https://pr.ibs.re.kr/handle/8788114/10938
DOI
10.1016/j.jelechem.2021.115479
ISSN
1572-6657
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > 1. Journal Papers (저널논문)
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