Journal
INORGANIC CHEMISTRY FRONTIERS
Volume 10, Issue 11, Pages 3359-3366Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d3qi00390f
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In this study, a cuprous sulfide (Cu1.96S) intermediate-assisted strategy is demonstrated for the scalable synthesis of PtCu3 intermetallic electrocatalysts on an S-doped carbon black support. It is found that the Cu1.96S 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, ensuring the formation of well-ordered intermetallic PtCu3 structures. The prepared intermetallic PtCu3 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.
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 (Cu1.96S) intermediate-assisted strategy for the scalable synthesis of PtCu3 intermetallic electrocatalysts on an S-doped carbon black support. We identify that the Cu1.96S 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 PtCu3 structures. The prepared intermetallic PtCu3 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.
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