Key Role of Bridge Adsorbed Hydrogen Intermediate on Pt-Ru Pair for Efficient Acidic Hydrogen Production.
basic_science · Level V
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- Record sourced from PubMed, PMID 40214975.
- Also identified by DOI 10.1002/adma.202503221.
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Abstract
Atop and multiple adsorbed hydrogen are considered as key intermediates on Pt-group metal for acidic hydrogen evolution reaction (HER), yet the role of bridge hydrogen intermediate (<sup>*</sup>H<sub>bridge</sub>) is consistently overlooked experimentally. Herein, a Pt atomic chain modified fcc-Ru nanocrystal (Pt-Ru(fcc)) is developed with a co-crystalline structure, featuring <sup>*</sup>H<sub>bridge</sub> intermediate bonded on the Pt-Ru pair site. Electrons leap from the pair site to <sup>*</sup>H<sub>bridge</sub> facilitate hydrogen desorption, thus accelerating the Tafel kinetics and ensuring outstanding electrocatalytic performance, with a low overpotential (4.0 mV at 10 mA cm<sup>-2</sup>) and high turnover frequency (56.4 H<sub>2</sub> s<sup>-1</sup> at 50 mV). Notably, the proton exchange membrane water electrolyzer PEMWE with ultra-low loading of 10 ug<sub>Pt</sub> cm<sup>-2</sup> shows excellent activity (1.61 V at 1.0 A cm<sup>-2</sup>) and low average degradation rate (4.0 µV h<sup>-1</sup> over 1000 h), significantly outperforming the benchmark Pt/C. Furthermore, the PEMWE-based 80 µm Gore membrane under identical operating conditions requires only 1.54 and 1.58 V to achieve 1.0 and 1.5 A cm<sup>-2</sup>. This finding highlights the key role of <sup>*</sup>H<sub>bridge</sub> at the Pt-Ru interface in obtaining high HER intrinsic activity and underscores the transformative potential in designing next-generation bimetallic catalysts for clean hydrogen energy.