Highly Distorted High-Entropy Alloy Aerogels for High-Efficiency Hydrogen Oxidation Reaction.
basic_science · Level V
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- Record sourced from PubMed, PMID 40165748.
- Also identified by DOI 10.1021/acsnano.5c02198.
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Abstract
The development of efficient electrocatalysts for alkaline hydrogen oxidation reaction (HOR) is essential for anion exchange membrane fuel cells and advancing the hydrogen economy. Herein, we demonstrated PtRuRhPdIr high-entropy alloy aerogels (HEAAs) with highly distorted structure as efficient HOR electrocatalysts and realized effective control of PtRu-based metallic aerogels (MAs) with elemental components ranging from two to seven. Specially, PtRuRhPdIr HEAAs on carbon (PtRuRhPdIr HEAAs/C) exhibit excellent HOR activity, with Pt group metal (PGM)-normalized mass activity (5.75 A mg<sub>PGM</sub><sup>-1</sup>) at 50 mV and exchange current density normalized by electrochemical surface area (0.69 mA cm<sup>-2</sup>), approximately 16.9 and 4.1 times that of the commercial Pt/C (0.34 A mg<sub>PGM</sub><sup>-1</sup>, 0.17 mA cm<sup>-2</sup>), respectively. The mechanism study shows that the highly distorted PtRuRhPdIr HEAAs provide abundant unsaturated sites for HOR, and the synergistic effect of multiple-active sites balances the adsorption of H* and *OH, boosting the HOR performance.