Mesoporous Pt@Pt-skin Pt<sub>3</sub>Ni core-shell framework nanowire electrocatalyst for efficient oxygen reduction.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 36934107.
- Also identified by DOI 10.1038/s41467-023-37268-4 and PMC identifier 10024750.
- 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
The design of Pt-based nanoarchitectures with controllable compositions and morphologies is necessary to enhance their electrocatalytic activity. Herein, we report a rational design and synthesis of anisotropic mesoporous Pt@Pt-skin Pt<sub>3</sub>Ni core-shell framework nanowires for high-efficient electrocatalysis. The catalyst has a uniform core-shell structure with an ultrathin atomic-jagged Pt nanowire core and a mesoporous Pt-skin Pt<sub>3</sub>Ni framework shell, possessing high electrocatalytic activity, stability and Pt utilisation efficiency. For the oxygen reduction reaction, the anisotropic mesoporous Pt@Pt-skin Pt<sub>3</sub>Ni core-shell framework nanowires demonstrated exceptional mass and specific activities of 6.69 A/mg<sub>pt</sub> and 8.42 mA/cm<sup>2</sup> (at 0.9 V versus reversible hydrogen electrode), and the catalyst exhibited high stability with negligible activity decay after 50,000 cycles. The mesoporous Pt@Pt-skin Pt<sub>3</sub>Ni core-shell framework nanowire configuration combines the advantages of three-dimensional open mesopore molecular accessibility and compressive Pt-skin surface strains, which results in more catalytically active sites and weakened chemisorption of oxygenated species, thus boosting its catalytic activity and stability towards electrocatalysis.