Implanting oxophilic metal in PtRu nanowires for hydrogen oxidation catalysis.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 38321034.
- Also identified by DOI 10.1038/s41467-024-45369-x and PMC identifier 10847104.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Bimetallic PtRu are promising electrocatalysts for hydrogen oxidation reaction in anion exchange membrane fuel cell, where the activity and stability are still unsatisfying. Here, PtRu nanowires were implanted with a series of oxophilic metal atoms (named as i-M-PR), significantly enhancing alkaline hydrogen oxidation reaction (HOR) activity and stability. With the dual doping of In and Zn atoms, the i-ZnIn-PR/C shows mass activity of 10.2 A mg<sub>Pt+Ru</sub><sup>-1</sup> at 50 mV, largely surpassing that of commercial Pt/C (0.27 A mg<sub>Pt</sub><sup>-1</sup>) and PtRu/C (1.24 A mg<sub>Pt+Ru</sub><sup>-1</sup>). More importantly, the peak power density and specific power density are as high as 1.84 W cm<sup>-2</sup> and 18.4 W mg<sub>Pt+Ru</sub><sup>-1</sup> with a low loading (0.1 mg cm<sup>-2</sup>) anion exchange membrane fuel cell. Advanced experimental characterizations and theoretical calculations collectively suggest that dual doping with In and Zn atoms optimizes the binding strengths of intermediates and promotes CO oxidation, enhancing the HOR performances. This work deepens the understanding of developing novel alloy catalysts, which will attract immediate interest in materials, chemistry, energy and beyond.