Fast and Durable Alkaline Hydrogen Oxidation Reaction at the Electron-Deficient Ruthenium-Ruthenium Oxide Interface.
basic_science · Level V
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- Record sourced from PubMed, PMID 36484270.
- Also identified by DOI 10.1002/adma.202208821.
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Abstract
The slow hydrogen oxidation reaction (HOR) kinetics under alkaline conditions remain a critical challenge for the practical application of alkaline exchange membrane fuel cells. Herein, Ru/RuO<sub>2</sub> in-plane heterostructures are designed with abundant active Ru-RuO<sub>2</sub> interface domains as efficient electrocatalysts for the HOR in alkaline media. The experimental and theoretical results demonstrate that interfacial Ru and RuO<sub>2</sub> domains at Ru-RuO<sub>2</sub> interfaces are the optimal H and OH adsorption sites, respectively, endowing the well-defined Ru(100)/RuO<sub>2</sub> (200) interface as the preferential region for fast alkaline hydrogen electrocatalysis. More importantly, the metallic Ru domains become electron deficient due to the strong interaction with RuO<sub>2</sub> domains and show substantially improved inoxidizability, which is vital to maintain durable HOR electrocatalytic activity. The optimal Ru/RuO<sub>2</sub> heterostructured electrocatalyst exhibits impressive alkaline HOR activity with an exchange current density of 8.86 mA cm<sup>-2</sup> and decent durability. The exceptional electrocatalytic performance of Ru/RuO<sub>2</sub> in-plane heterostructure can be attributed to the robust and multifunctional Ru-RuO<sub>2</sub> interfaces endowed by the unique metal-metal oxide domains.