Abstract
Urchin-like NiCo2O4 nanoneedles were grown on a nickel foam via hydrothermal synthesis, and then the surface of the structure was modified to a candle-like nano-array via electrodepositing of Ni3S2. The resulting structure was analyzed as a supercapacitor electrode by x-ray diffraction, high-resolution scanning electron microscopy, and electrochemical measurements. Based on the electrochemical measurements, the NiCo2O4@Ni3S2 core–shell structure electrode exhibited a remarkable specific capacity of 1800 F g−1, and a rate capability of 1764 F g−1 at 2 mVs−1. This electrode also maintained 98% capacity after 2000 cycles at this current density. These results are promising compared to the electrochemical performance of the NiCo2O4 electrode (specific capacity of 1460 F g−1 and 86% capacity retention after 2000 cycles at a scan rate of 2 mVs−1). It is therefore concluded that the surface modification of the NiCo2O4 electrode facilitates electron transfer and cause an advancement in the capacitive performance of the NiCo2O4@Ni3S2 electrode.
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Shobeiri, M., Tahmasebi, K. & Hosseini, S.M.A. Urchin-Like NiCo2O4@Ni3S2 Core/Shell Nanostructure as Supercapacitor Electrode. J. Electron. Mater. 52, 6416–6424 (2023). https://doi.org/10.1007/s11664-023-10621-5
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DOI: https://doi.org/10.1007/s11664-023-10621-5