| 研究実績の概要 |
The critical bottleneck for sustainable production of hydrogen has remained in sluggish oxygen evolving reaction (OER), requiring insufficiently low overpotentials, η. We succeeded in reporting a facile and versatile method for the preparation of loading-controllable metal oxide films adhered rigidly on electrode substrates, enabling effectual material hunting for superior OER anodes. This allows us to discover a ternary FeNiWOx film on a nickel foam (NF), attaining one of the lowest overpotentials of η10 = 167 (The superscripts represent the attained current densities of 10 mA cm-2) with a Tafel slope of 49 mV dec-1 and at least 100 h stability in OER, which compare advantageously with only a few state-of-the-art OER anodes with excellent η10 < 200 mV. The electrochemical data indicate synergistic coupling among ternary metal centers of Ni, Fe and W to decrease the η value. The OER current is pH-dependent for the FeNiWOx film, showing the non-proton-concerted process in the rate-determining step for OER.
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| 今後の研究の推進方策 |
We plan to further Improve the OER performance of FeNiWOx via fabrication as a core-shell. The core will comprise of FeNiWXn (X = N, P, S, Se, and Te) and the shell comprises FeNiWOx that is formed by partial oxidation of X (X = N, P, S, Se, and Te) into O. The core provides a high conductivity medium for the electron flow from shell to nickel foam (NF), enhancing its OER performance.
we aim to investigate and enhance the HER performance of FeNiWXn and understand the active species (Fe, Ni, W, or combination of them) to develop more efficient catalysts.
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