2021 Fiscal Year Research-status Report
Understanding and development of highly efficient water splitting catalysts with core-shell structures for solar-hydrogen production
| Project/Area Number |
20K05684
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| Research Institution | Niigata University |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | catalysts / Nickel sulfide / Nickel salts |
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| Outline of Annual Research Achievements |
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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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
We were able to achieve our target in preparing a highly efficient water oxidation catalysts based on earth abundant materials. These catalysts showed very high activity for the water oxidation which is essential half reaction for the hydrogen production.
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| Strategy for Future Research Activity |
We are currently trying to stabilize these Ni based catalysts to work for long terms (years) which are essential for practical application towards the production of hydrogen. We also trying to understand the special properties of these materials in order to developing more efficient and stable catalysts for the water oxidation.
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Research Products
(7 results)
