Surfactant-free synthesis of highly methanol-tolerant, polyhedral Pd–Pt nanocrystallines for oxygen reduction reaction

Carbon supported polyhedral Pd–Pt nanocrystallines (Pd–Pt/C) are synthesized using a facile surfactant-free process. The morphology of nanocrystallines is tailored by ammonia complexation and Pd/Pt ratios of the metallic precursors. The as-prepared Pd–Pt/C catalysts with low Pt content exhibit oxyge...

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Bibliographic Details
Published in:Journal of power sources 2013-10, Vol.239, p.374-381
Main Authors: Tang, Yongfu, Gao, Faming, Yu, Shengxue, Li, Zhiping, Zhao, Yufeng
Format: Article
Language:English
Subjects:
Carbon
Catalysis
Catalysts
Chemistry
Electrochemistry
Exact sciences and technology
General and physical chemistry
Low platinum catalysts
Methanol tolerance
Methyl alcohol
Nanocrystals
Oxygen reduction reaction
Palladium
Palladium–platinum catalysts
Platinum
Polyhedral nanocrystalline
Reduction
Surfactant-free synthesis
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Summary:Carbon supported polyhedral Pd–Pt nanocrystallines (Pd–Pt/C) are synthesized using a facile surfactant-free process. The morphology of nanocrystallines is tailored by ammonia complexation and Pd/Pt ratios of the metallic precursors. The as-prepared Pd–Pt/C catalysts with low Pt content exhibit oxygen reduction reaction (ORR) activity comparable to that of the commercial Pt/C catalyst, while having much higher methanol tolerance. Compared with the spherical Pd6Pt/C catalyst, the polyhedral Pd6Pt/C catalyst shows 1.56-fold higher mass specific activity for ORR, while its electrochemical surface area (ECSA) is only half of the former. The superior ORR activity may be attributed to the more exposed regular (111) planes, the higher ratio of metallic form and the surface enrichment of Pt atoms. [Display omitted] •Polyhedral Pd–Pt nanocrystallines were synthesized without any surfactants.•Low-Pt polyhedral Pd–Pt/C catalysts exhibit comparable ORR to TKK Pt/C catalyst.•The as prepared Pd–Pt/C show excellent methanol tolerance.•Polyhedral Pd–Pt/C with low ECSA show 1.56-fold mass activity to spherical Pd–Pt/C.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2013.03.151