Trimetallic Au@PdPt core-shell nanoparticles with ultrathin PdPt skin as highly stable electrocatalysts for the oxygen reduction reaction in acid solution
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To design efficient and low-cost core-shell electrocatalysts with an ultrathin platinum shell, the balance between platinum dosage and durability in acid solution is of great importance. In the present work, trimetallic Au@PdPt core-shell nanoparticles (NPs) with Pd/Pt molar ratios ranging from 0.31:1 to 4.20:1 were synthesized based on the Au catalytic reduction strategy and the subsequent metallic replacement reaction. When the Pd/Pt molar ratio is 1.19:1 (designated as Au@Pd1.19Pt1 NPs), the superior electrochemical activity and stability were achieved for oxygen reduction reaction (ORR) in acid solution. Especially, the specific and mass activities of Au@Pd1.19Pt1 NPs are 1.31 and 6.09 times higher than those of commercial Pt/C catalyst. In addition, the Au@Pd1.19Pt1 NPs presented a good durability in acid solution. After 3000 potential cycles between 0.1 and 0.7 V (vs. Ag/AgCl), the oxygen reduction activity is almost unchanged. This study provides a simple strategy to synthesize highperformance trimetallic ORR electrocatalyst for fuel cells.
Keywordselectrocatalyst core-shell platinum oxygen reduction reaction nanoparticle fuel cell
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This work was supported by the National Natural Science Foundation of China (21773224, 21633008, 21575134, 11374297, 21405149), the National Key Research and Development Plan (2016YFA0203200) and K. C. Wong Education Foundation.