A Facile and Environmentally Friendly One-Pot Synthesis of Pt Surface-Enriched Pt-Pd(x)/C Catalyst for Oxygen Reduction
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Platinum surface-enriched bimetallic PtPd nanoparticles are synthesized via a facile and eco-friendly approach. Significantly different formation processes of single Pt, Pd, and bimetallic PtPd nanoparticles under various conditions have been monitored by UV-visible spectra. The size of the bimetallic Pt-Pd nanoparticles has been found to be significantly affected by the pH of the starting precursor solutions. Uniform bimetallic Pt-Pd nanoparticles with an average diameter of ~3 nm are formed in the basic solutions; however, the particle size can be as large as 11 nm when synthesized in acidic media. The detailed morphology, composition, and structure of the carbon-supported bimetallic Pt-Pd electrocatalysts have been extensively characterized and correlated with their electrochemical properties as evaluated using cyclic voltammetry and single-cell test. The formation of Pt surface-enriched Pt-Pd bimetallic nanoparticles has been confirmed by X-ray photoelectron spectroscopy and has been interpreted by the exclusively reduced Pt around the newly formed Pd nuclei due to the catalytic action of Pd, which in turn curbs the unfavorable growth of the bimetallic nanoparticles. The electrochemical tests indicate that the optimized Pt-Pd/C with reduced cost exhibits competitive catalytic performance toward oxygen reduction reaction and superior tolerance to methanol over the state-of-the-art Pt/C.
KeywordsOxygen reduction Bimetallic Pt-Pd Electrocatalysts Ethylene glycol
This work was supported by the National Natural Science Foundation (51572090), Science and Technology Planning Project of Guangdong Province (2014A010105041, 2016A010103028, and 2016B010134002), and Guangdong Innovative and Entrepreneurial Research Team Program (No. 2014ZT05N200).
Compliance with Ethical Standards
Conflict of Interest
The authors declare that they have no conflict of interest.
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