In:
Inorganic Chemistry Frontiers, Royal Society of Chemistry (RSC)
Kurzfassung:
Small-sized Pt-based intermetallic compounds (IMCs) with unique electronic and geometrical structures are promising candidates as next-generation oxygen-reduction reaction (ORR) catalysts in proton-exchange membrane fuel cells (PEMFCs). However, the synthesis of IMC catalysts remains challenging owing to the trade-off relation between the alloying/ordering degree and particle aggregation/sintering under a high-temperature annealing process. Herein, we demonstrate a cuprous sulfide (Cu 1.96 S) intermediate-assisted strategy for the scalable synthesis of PtCu 3 intermetallic electrocatalysts on an S-doped carbon black support. We identify that the Cu 1.96 S intermediate formed at low temperature gradually releases metallic Cu species at high temperatures to form a small-sized and uniform Pt–Cu alloy with target stoichiometry, which eventually ensures the formation of well-ordered intermetallic PtCu 3 structures. The prepared intermetallic PtCu 3 catalysts exhibit enhanced ORR performance with a mass activity of 3.2 A mg Pt −1 and retain 72% of the initial activity after durability tests.
Materialart:
Online-Ressource
ISSN:
2052-1553
Sprache:
Englisch
Verlag:
Royal Society of Chemistry (RSC)
Publikationsdatum:
2023
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