Promoting ordering degree of intermetallic fuel cell catalysts by low-melting-point metal doping.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 37736762.
- Also identified by DOI 10.1038/s41467-023-41590-2 and PMC identifier 10516855.
- 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
Carbon supported intermetallic compound nanoparticles with high activity and stability are promising cathodic catalysts for oxygen reduction reaction in proton-exchange-membrane fuel cells. However, the synthesis of intermetallic catalysts suffers from large diffusion barrier for atom ordering, resulting in low ordering degree and limited performance. We demonstrate a low-melting-point metal doping strategy for the synthesis of highly ordered L1<sub>0</sub>-type M-doped PtCo (M = Ga, Pb, Sb, Cu) intermetallic catalysts. We find that the ordering degree of the M-doped PtCo catalysts increases with the decrease of melting point of M. Theoretic studies reveal that the low-melting-point metal doping can decrease the energy barrier for atom diffusion. The prepared highly ordered Ga-doped PtCo catalyst exhibits a large mass activity of 1.07 A mg<sub>Pt</sub><sup>-1</sup> at 0.9 V in H<sub>2</sub>-O<sub>2</sub> fuel cells and a rated power density of 1.05 W cm<sup>-2</sup> in H<sub>2</sub>-air fuel cells, with a Pt loading of 0.075 mg<sub>Pt</sub> cm<sup>-2</sup>.