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Promoting ordering degree of intermetallic fuel cell catalysts by low-melting-point metal doping
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Promoting ordering degree of intermetallic fuel cell catalysts by low-melting-point metal doping
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Journal Article
Promoting ordering degree of intermetallic fuel cell catalysts by low-melting-point metal doping
2023
Overview
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
0
-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
Pt
−1
at 0.9 V in H
2
-O
2
fuel cells and a rated power density of 1.05 W cm
−2
in H
2
-air fuel cells, with a Pt loading of 0.075 mg
Pt
cm
−2
.
The development of highly ordered intermetallic catalyst for oxygen reduction reactions suffers from large diffusion barrier for atom ordering. Here, the authors use a low melting-point metal doping strategy to synthesize a series of highly ordered metal-doped platinum–cobalt alloy fuel cell catalysts.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
