Surface Ru enriched structurally ordered intermetallic PtFe@PtRuFe core-shell nanostructure boosts methanol oxidation reaction catalysis

[Display omitted] •We succeeded in fabricating a surface Ru enriched structurally ordered intermetallic PtFe@PtRuFe nanostructure.•We found that the atomic radius of Fe and Ru is a highly decisive factor for the surface composition of the PtFe@PtRuFe.•The well-Constructed PtFe@PtRuFe catalyst exhibi...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2019-09, Vol.252, p.120-127
Main Authors: Wang, Qingmei, Chen, Siguo, Li, Pan, Ibraheem, Shumaila, Li, Jia, Deng, Jianghai, Wei, Zidong
Format: Article
Language:English
Subjects:
Anodizing
Catalysis
Catalysts
Charge transfer
Composition
Core-shell nanostructure
Core-shell structure
Intermetallic compounds
Iron
Leaching
Methanol
Methanol oxidation reaction
Nanostructure
Noble metals
Oxidation
Poisoning
Ruthenium
Shells
Structurally ordered
Surface Ru enriched
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Summary:[Display omitted] •We succeeded in fabricating a surface Ru enriched structurally ordered intermetallic PtFe@PtRuFe nanostructure.•We found that the atomic radius of Fe and Ru is a highly decisive factor for the surface composition of the PtFe@PtRuFe.•The well-Constructed PtFe@PtRuFe catalyst exhibits excellent anti-CO poisoning ability and MOR catalytic activity. Atomic-level control of the surface composition and atomic arrangement of multimetalic alloy nanocatalyst has emerged as an effective strategy to optimize their catalytic performance. By integrating the space-confined alloying and surface engineering strategies, we demonstrate a new class of core-shell structured PtFe@PtRuFe nanocatalyst, composed of an ordered PtFe intermetallic core with a 3–5 atomic-layers-thick PtRuFe shell. The well-defined PtFe@PtRuFe core-shell nanostructure exhibits excellent anti-CO poisoning ability and resistance to Fe leaching, achieving a factor of 1.68 enhancement in mass activity and a factor of 1.57 improvement in specific activity toward methanol oxidation reaction (MOR) compared to the state-of-the-art PtRu/C catalysts. Furthermore, the CO anodic oxidation on the PtFe@PtRuFe catalyst surface (0.39 V) starts much earlier than on the commercial PtRu/C (0.43 V) and Pt/C (0.83 V) catalysts. The enhanced MOR activity and anti-CO poisoning ability of the PtFe@PtRuFe catalyst is mainly attributed to the well-defined core-shell structure and favorable composition as well as the charge transfer from Fe/Ru to Pt and thusly be weakened Pt-COads adsorption energy. This novel core-shell structured nanocatalyst provide a new direction to reduce the usage of noble metal, tune the surface composition and atomic arrangement, enhance the activity and stability of multimetalic alloy nanocatalyst.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2019.04.023