Synthesis of octahedral Pt-Ni-Ir yolk-shell nanoparticles and their catalysis in oxygen reduction and methanol oxidization under both acidic and alkaline conditions

Fuel cells are expected to be one of the most promising alternatives to the increasingly scarce fossil fuels, and Pt is the most commonly used catalyst for anodic and cathodic electrochemical reactions. To realize large-scale commercialization, it is most urgent to improve the efficiency of Pt and r...

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Bibliographic Details
Published in:Nanoscale 2019-12, Vol.11 (48), p.2326-23216
Main Authors: Yang, Tao, Wang, Yihui, Wei, Wenxian, Ding, Xinran, He, Maoshuai, Yu, Tingting, Zhao, Hong, Zhang, Dongen
Format: Article
Language:English
Subjects:
Acidic oxides
Alternative fuels
Catalysis
Catalysts
Chemical reactions
Commercialization
Deposition
Fossil fuels
Fuel cells
Functional materials
Iridium
Methanol
Nanoparticles
Reduction
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Summary:Fuel cells are expected to be one of the most promising alternatives to the increasingly scarce fossil fuels, and Pt is the most commonly used catalyst for anodic and cathodic electrochemical reactions. To realize large-scale commercialization, it is most urgent to improve the efficiency of Pt and reduce the cost. Here, we synthesized an octahedral Pt-Ni-Ir yolk-shell catalyst through stepwise co-deposition (SCD), surface-limited Pt deposition (SLPD) and Ni-coordinating etching (NCE) processes. Experimental studies showed that the catalytic activities of the as-prepared trimetal yolk-shell catalyst were several times higher than that of the commercial Pt/C towards oxygen reduction and methanol oxidization under both acidic and alkaline conditions. This work may be extended to designing other multimetallic functional materials with complex hierarchical nanostructures, which is conducive to greatly enhancing the performance. A Pt-Ni-Ir yolk-shell catalyst was synthesized using facile processes and displayed superior catalytic activity for oxygen reduction and methanol oxidization.
ISSN:2040-3364
2040-3372
DOI:10.1039/c9nr07235g