Engineering Amorphous/Crystalline Ru(OH)<sub>3</sub>/CoFe-Layered Double Hydroxide for Hydrogen Evolution at 1000 mA cm<sup>–2</sup>
(2023) Inorganic Chemistry — Vol. 62, n° 19, p. 7424-7433 (2023)
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Zhou, Li 
Wang, Chundong
- Abstract
- For large-scale industrial applications, it is highly desirable to create effective, economical electrocatalysts with long-term stability for the hydrogen evolution reaction (HER) at a large current density. Herein, we report a unique motif with crystalline CoFe-layered hydroxide (CoFe-LDH) nanosheets enclosed by amorphous ruthenium hydroxide (a-Ru(OH)3/CoFe-LDH) to realize the efficient hydrogen production at 1000 mA cm–2, with a low overpotential of 178 mV in alkaline media. During the continuous HER process for 40 h at such a large current density, the potential remains almost constant with only slight fluctuations, indicating good long-term stability. The remarkable HER performance can be attributed to the charge redistribution caused by abundant oxygen vacancies in a-Ru(OH)3/CoFe-LDH. The increased electron density of states lowers the charge-transfer resistance and promotes the formation and release of H2 molecules. The water-splitting electrolyzer with a-Ru(OH)3/CoFe-LDH as both an anode and a cathode in 1.0 M KOH demonstrates stable hydrogen production and a 100% faradic efficiency. The design strategy of interface engineering in this work will inspire the design of practical electrocatalysts for water splitting on an industrial scale.
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Citations
Cheng, Z., Tan, Z., Zhou, L., Li, L., Xu, X., Yuen, M. F., Li, L., Pang, Y., Debecker, D., Ma, R., & Wang, C. (2023). Engineering Amorphous/Crystalline Ru(OH)<sub>3</sub>/CoFe-Layered Double Hydroxide for Hydrogen Evolution at 1000 mA cm<sup>–2</sup> Inorganic Chemistry, 62(19), 7424-7433. https://doi.org/10.1021/acs.inorgchem.3c00686 (Original work published 2023)