Journal
ACS CATALYSIS
Volume 13, Issue 11, Pages 7417-7427Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.3c00371
Keywords
Pt alloys; rare earth metals; operando measurements; oxygen reduction reaction; proton exchange membranefuel cells
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This article describes the application of carbon-supported platinum-neodymium nanoalloys as oxygen reduction reaction (ORR) electrocatalysts. The unique structural dynamics of Pt-Nd nanoalloys in a simulated cathode environment of proton exchange membrane fuel cells (PEMFC) are revealed through extensive experimental and theoretical investigations. The findings suggest that the long-term ORR activity is mediated by surface compressive strain rather than charge transfer between Pt and Nd.
Platinum-rare earth nanoalloys have been predicted tobe promisingproton exchange membrane fuel cell (PEMFC) electrocatalysts for thecathodic oxygen reduction reaction (ORR). However, their implementationin PEMFCs is limited by the challenge of their preparation as carbon-supportednanostructures. Consequently, the practical structure-activity-stabilitytrends for this class of nanoalloys remain largely unexplored. Herein,carbon-supported Pt-Nd nanoalloys as ORR electrocatalysts aredescribed. The physical chemistry of selected electrocatalysts wasextensively investigated by means of combined ex situ and operando techniques, which reveal the uniquestructural dynamics of Pt-Nd nanoalloys in a simulated PEMFCcathode environment. The experimental observations, supported by theoreticalcalculations, indicate that after initial significant structural modificationin the early stage of operation, the ORR activity is mediated in thelonger term by surface compressive strain rather than charge transferbetween Pt and Nd. Such key operando structure-activity-stabilityrelations underpin further optimization of carbon-supported Pt-rareearth nanoalloys as fuel cell cathode catalysts.
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