Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 895, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2021.115479
Keywords
Web-like morphology; Nickel selenide; Cobalt selenide; Electrodeposition; Supercapacitor
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Funding
- Basic Science Research Pro-gram of the National Research Foundation of Korea (NRF) - Ministry of Education [2018R1D1A3B05042787]
- Human Resources Program in Energy Technology of the Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry & Energy, Republic of Korea [20204010600100]
- Institute for Basic Science of Korea [IBSR006A2]
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This study reported the development of a double-layer CoSe2/NiSe2 film as a high-performance electrode material for supercapacitors. The film exhibited a distinctive web-like morphology and large surface area, providing interconnected pathways for charge transport and improved ion-diffusion kinetics. The double-layer CoSe2/NiSe2 electrode showed enhanced performance in supercapacitors compared to single-layer CoSe2 and NiSe2, with high specific capacity, outstanding rate capability, and decent cycling stability.
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).
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