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PDA-assisted formation of ordered intermetallic CoPt3 catalysts with enhanced oxygen reduction activity and stability

Abstract

Structurally ordered intermetallic alloys with definite composition and distinct structure show a great potential as the electro-catalyst for the oxygen reduction reaction (ORR). However, its fabrication with small particle size remains a challenge since grain growth caused by high temperature annealing is unavoidable for the formation of ordered phase. Here we propose an effective space-confined strategy to prepare the intermetallic alloy with small size (CoPt3/C-S) through annealing of disordered Pt-Co alloy coated by polydopamine (PDA). The CoPt3/C-S intermetallic catalyst exhibits over 7-fold higher ORR activity and comparable stability compared to the large intermetallic nanoparticles (CoPt3/C-L) prepared by the direct heat-treatment without PDA. The superior ORR performance of the CoPt3/C-S catalyst can be attributed to the abundant active sites and unsaturated coordinated bonds caused by its special electronic structure, as proved by the XPS and XAS tests. This work not only proposes a feasible synthesis route for small intermetallic nanoparticles but also provides a valid strategy to improve the ORR performance of ordered intermetallic catalyst.

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Publication details

The article was accepted on 10 Apr 2018 and first published on 10 Apr 2018


Article type: Paper
DOI: 10.1039/C8NR02207K
Citation: Nanoscale, 2018, Accepted Manuscript
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    PDA-assisted formation of ordered intermetallic CoPt3 catalysts with enhanced oxygen reduction activity and stability

    Y. Zhao, C. Wang, J. Liu and F. Wang, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR02207K

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