Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 790, Issue -, Pages 792-798Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.03.196
Keywords
Nanoparticle; Methanol oxidation; Noble metal; Electrocatalytic
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Funding
- National Natural Science Foundation of China [21501106]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars and Qingdao Municipal Science and Technology Commission [16-5-1-86-jch]
- Chemistry Faculty Talents Foundation of Qingdao University of Science and Technology
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Au@AgPt yolk-shell nanoparticles (Y-SNPs) with Au core and porous Ag/Pt alloy shell were prepared via a double-template method. This synthesis employed Au@Ag core-shell nanoparticles as a hard-template to obtain Au@AgPt Y-SNPs by a galvanic replacement reaction between PtCl62- and Ag. Brij-58 surfactant micelles served as a soft-template to prepare dendritic and porous shell. The thus-synthesized Au@AgPt Y-SNPs exhibited enhanced catalytic performance (889 mA mgpt(-1)) and stability for methanol oxidation reaction (MOR) at room temperature, which is 5 times as high as the commercial Pt/C (20 wt% Pt). The enhanced electrocatalytic activity is attributed to following aspects: electronic effect between Pt and Au, synergism between Pt and Ag, and nanoreactor confinement effect in the cavity between the Au core and the shell. The present work provides a simple strategy for the formation of ternary metallic Y-SNPs, which exhibit promising applications in electrocatalysis, energy conversion and sensing. (C) 2019 Elsevier B.V. All rights reserved.
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