| 研究実績の概要 |
We succeeded in developing a unique motif of nickel sulfide nanowires stuffed into carbon nitride scabbards (NiSx/C3N4) electrocatalyst for electrocatalytic water splitting that exhibited the lowest overall overpotential of 72 mV for water splitting when used as an anode in alkaline water electrolysis. This motif provides a key of a guided thought to develop efficient catalysts for oxygen evolution. We also developed Different NiOx films adhered rigidly on nickel foam (NF) and fluorine-doped tin oxide (FTO) substrates prepared from different Ni salts via a mixed metal-imidazole casting (MiMIC) method. The counter ions of Ni salts are significantly influential on the structure and characters of the formed NiOx films. In the case of the film prepared from the sulfate precursor, an amorphous NiIIIOx nano-sheet film was formed in contrast to face-centered cubic NiIIO crystalline nanoparticle films formed using the other precursors, under the same conditions. The SO4-NiOx / NF electrode demonstrated the superior OER performance with an overpotential, η10 = 228 mV at a current density of 10 mA cm－2 in alkaline KOH solutions, which is lower by 145 ~ 165 mV than those (η10 = 373 ~ 393 mV) of the other NiOx / NF electrodes. The OER performance of the SO4-NiOx / NF electrode compares advantageously with state-of-the-art Ni-based anodes reported to date.
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