Mo-doped PdCu nanoparticles as high-performance catalysts for oxygen reduction reactions

The instability of palladium-based binary alloys hinders their wide application in the oxygen reduction processes. Here, we prepared Mo-doped PdCu nanoparticles with controllable dopant content and valence. Further research has revealed that Mo, particularly Mo 5+ , may effectively suppress the oxid...

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2023-12, Vol.52 (47), p.1781-17817
Main Authors: Kang, Kailu, Hu, Xing, Zhang, Pei, Zhang, Yangyang, Zhu, Shan, Lei, Kaixiang, Jiang, Kezhu, Zheng, Shijian
Format: Article
Language:English
Subjects:
Binary alloys
Catalysts
Catalytic activity
Chemical reduction
Controllability
Fuel cells
Nanoparticles
Oxidation
Oxygen reduction reactions
Palladium
Stability
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Summary:The instability of palladium-based binary alloys hinders their wide application in the oxygen reduction processes. Here, we prepared Mo-doped PdCu nanoparticles with controllable dopant content and valence. Further research has revealed that Mo, particularly Mo 5+ , may effectively suppress the oxidation of Pd and Cu, optimize the oxygen binding of Pd, and increase catalytic activity and stability. In particular, Mo-PdCu-1/C with the highest Mo 5+ content shows the best oxygen reduction reaction (ORR) mass activity (1.20 A mg −1 Pd ), which is 4.8 times higher than that of PdCu/C. It also exhibits outstanding stability, retaining 80.8% of the original mass activity after 20 000 cycles. This study clearly explains the mechanism by which Mo doping affects the performance and provides a reference for further optimization of catalyst performance for fuel cell industrialization. The doping of Mo element, particularly Mo 5+ , has a dual effect on Pd, regulating its electronic structure and inhibiting oxidation. Therefore, the Mo-PdCu/C-1 catalyst, enriched with the highest Mo 5+ content, exhibits superior performance for ORR.
ISSN:1477-9226
1477-9234
DOI:10.1039/d3dt02773b