Journal
SURFACES AND INTERFACES
Volume 34, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.surfin.2022.102340
Keywords
Electrode materials; Chemical synthesis; Crystal structure; Electrochemical impedance spectroscopy; Transmission electron microscopy; X-ray diffraction
Categories
Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2019R1A5A8080290]
- Railroad Technology Research Program (RTRP) - Ministry of Land, Infrastructure and Transport of Korean government [22RTRP-C146008-05]
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A NiCo2O4 nanowire/NiCo2O4 nanosheet composite with a hierarchically arranged morphology showed enhanced electrochemical performance as a high-performance supercapacitor, with higher specific capacitance and cycling stability.
A NiCo2O4 nanowire/NiCo2O4 nanosheet composite with a nanostructure was fabricated on nickel foam for use in high-performance supercapacitors by using two-step solution-based approaches such as hydrothermal and chemical bath deposition methods. In this study, the supercapacitive performance of NiCo2O4 nanowires was compared with that of NiCo2O4 nanowire/NiCo2O4 nanosheet arrays in a 2 M KOH electrolyte. The electrochemical study shows that NiCo2O4 nanowires/NiCo2O4 nanosheets exhibit higher electrochemical performance than NiCo2O4 nanowires. The NiCo2O4 nanowires/NiCo2O4 nanosheets (1866 F/g) have a high specific capacitance than NiCo2O4 nanowires (1023 F/g), at 2 A/g. Further, NiCo2O4 nanowire/NiCo2O4 nanosheet arrays show high electrochemical cycling stability of 94.8% over 5,000 cycles. This enhanced electrochemical performance is attributed to the hierarchically arranged morphology of the NiCo2O4 nanowire/NiCo2O4 nanosheet composite, which provides a large number of active sites for redox reactions, and fast ion-transfer ability.
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