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Trimetallic PtAuNi Alloy Nanoparticles as an Efficient Electrocatalyst for Methanol Electrooxidation Reaction

Abstract

Platinum is an excellent electrocatalyst. However, the disadvantages of Pt as an electrocatalyst lie in its poor earth abundance, high cost, and poor stability due to surface poisoning. Thus it remains a challenge to find suitable alternate electrocatalysts and/or reduce the use of Pt. Herein, we report solvothermal synthesis of bimetallic (PtAu and PtNi) and trimetallic (PtAuNi) alloy nanoparticles (NPs) with controlled percentages of individual metals. With an optimized Ni content, the trimetallic (Pt66Au11Ni23) alloy NPs shows superior electrocatalytic activity (in terms of lower onset oxidation potential, higher Ip,f/Ip,r, and higher mass activity) not only to bimetallic alloy NPs (PtAu and PtNi) but also to commercial Pt/C (20% Pt loading) for methanol electrooxidation (MEO). This enhanced electrocatalytic activity is due to the synergistic role of different metals in the MEO catalysis. In particular, the catalytic activity is found to be controlled by the balance between adsorption of methanol species on Pt and the removal of carbonaceous species from the catalyst surface by Au and Ni as demonstrated here. The multimetallic alloy of optimal individual content thereby not only reduces the Pt content in the catalyst but also exhibited higher electrocatalytic activity than Pt for MEO that is desirable for fuel cell applications.

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Publication details

The article was received on 18 Jul 2017, accepted on 13 Oct 2017 and first published on 13 Oct 2017


Article type: Paper
DOI: 10.1039/C7DT02608K
Citation: Dalton Trans., 2017, Accepted Manuscript
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    Trimetallic PtAuNi Alloy Nanoparticles as an Efficient Electrocatalyst for Methanol Electrooxidation Reaction

    K. Bhunia, S. Khilari and D. Pradhan, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT02608K

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