Phase diagrams guide synthesis of highly ordered intermetallic electrocatalysts: separating alloying and ordering stages

Wei-Jie Zeng, Chang Wang, Qiang-Qiang Yan, Peng Yin, Lei Tong and Hai-Wei Liang ()
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Wei-Jie Zeng: University of Science and Technology of China
Chang Wang: Chinese Academy of Sciences
Qiang-Qiang Yan: University of Science and Technology of China
Peng Yin: University of Science and Technology of China
Lei Tong: University of Science and Technology of China
Hai-Wei Liang: University of Science and Technology of China

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract Supported platinum intermetallic compound catalysts have attracted considerable attention owing to their remarkable activities and durability for the oxygen reduction reaction in proton-exchange membrane fuel cells. However, the synthesis of highly ordered intermetallic compound catalysts remains a challenge owing to the limited understanding of their formation mechanism under high-temperature conditions. In this study, we perform in-situ high-temperature X-ray diffraction studies to investigate the structural evolution in the impregnation synthesis of carbon-supported intermetallic catalysts. We identify the phase-transition-temperature (TPT)-dependent evolution process that involve concurrent (for alloys with high TPT) or separate (for alloys with low TPT) alloying/ordering stages. Accordingly, we realize the synthesis of highly ordered intermetallic catalysts by adopting a separate annealing protocol with a high-temperature alloying stage and a low-temperature ordering stage, which display a high mass activity of 0.96 A mgPt–1 at 0.9 V in H2–O2 fuel cells and a remarkable durability.

Date: 2022
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DOI: 10.1038/s41467-022-35457-1

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