Thermally driven interfacial diffusion synthesis of nitrogen-doped carbon confined trimetallic Pt3CoRu composites for the methanol oxidation reaction

A current challenge to direct methanol fuel cells (DMFCs) is the insufficient electrocatalytic activity and anti-CO poisoning ability of Pt-based alloy catalysts toward the methanol oxidation reaction (MOR). In this work, a simple thermally driven interfacial diffusion alloying method is adopted to...

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Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2019, Vol.7 (30), p.18143-18149
Main Authors: Wang, Qingmei, Chen, Siguo, Lan, Huiying, Pan, Li, Ping, Xinyu, Ibraheem, Shumaila, Long, Daojun, Duan, Yijun, Wei, Zidong
Format: Article
Language:English
Subjects:
Alloy development
Alloying
Carbon monoxide poisoning
Catalysis
Catalysts
Diffusion
Electrocatalysts
Fuel cells
Fuel technology
Methanol
Nanoparticles
Oxidation
Platinum base alloys
Poisoning
Synergistic effect
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Summary:A current challenge to direct methanol fuel cells (DMFCs) is the insufficient electrocatalytic activity and anti-CO poisoning ability of Pt-based alloy catalysts toward the methanol oxidation reaction (MOR). In this work, a simple thermally driven interfacial diffusion alloying method is adopted to synthesize Pt3CoRu/C@NC trimetallic nanoparticles (NPs) with enhanced MOR activity and anti-CO poisoning ability. The MOR mass activity of the Pt3CoRu/C@NC catalyst (0.97 mA μgPt−1) is 4.2 times larger than that of the commercial Pt/C catalyst (0.23 mA μgPt−1). Moreover, the Pt3CoRu/C@NC catalyst exhibits a much lower CO oxidation onset potential than the commercial Pt/C catalyst (0.35 V vs. 0.82 V), which directly indicates the improved anti-CO poisoning ability of the catalyst. This enhancement in MOR activity as well as anti-CO poisoning ability of the Pt3CoRu/C@NC catalyst is mainly attributed to the synergistic effect of Ru (as a water activator) and Co (as an electronic modifier). Indeed, this work not only provides a satisfactory strategy for improving the activity and anti-CO poisoning ability of MOR electrocatalysts but also gives a significant insight into simple and cost-effective alloying methods for developing homogeneous trimetallic alloy catalysts.
ISSN:2050-7488
2050-7496
DOI:10.1039/c9ta04412d