期刊
SCIENCE BULLETIN
卷 65, 期 16, 页码 1396-1404出版社
ELSEVIER
DOI: 10.1016/j.scib.2020.04.015
关键词
Oxygen reduction reaction; Fuel cells; Diverse interfaces; Pt monolayer; Interface engineering
资金
- Natural Science Foundation of Hainan Province [2019RC007]
- National Natural Science Foundation of China [21805104, 21606050, 21905056, 21905045, U1801257]
- Natural Science Foundation of Guangdong Province [2018A0303130239, 2018A0303130223]
- Pearl River Science and Technology New Star Project [201806010039]
- Start-up Research Foundation of Hainan University [KYQD(ZR)1908]
- Research Fund Program of Key Laboratory of Fuel Cell Technology of Guangdong Province
Alloyed nanoparticles with core-shell structures provide a favorable model to modulate interfacial interaction and surface structures at the atomic level, which is important for designing electrocatalysts with high activity and durability. Herein, core-shell structured Pd3M@Pt/C nanoparticles with binary PdM alloy cores (M = Fe, Ni, and Co) and a monolayer Pt shell were successfully synthesized with diverse interfaces. Among these, Pd3Fe@Pt/C exhibited the best oxygen reduction reaction catalytic performance, roughly 5.4 times more than that of the commercial Pt/C catalyst used as reference. The significantly enhanced activity is attributed to the combined effects of strain engineering, interfacial electron transfer, and improved Pt utilization. Density functional theory simulations and extended X-ray absorption fine structure analysis revealed that engineering the alloy core with moderate lattice mismatch and alloy composition (Pd3Fe) optimizes the surface oxygen adsorption energy, thereby rendering excellent electrocatalytic activity. Future researches may use this study as a guide on the construction of highly effective core-shell electrocatalysts for various energy conversions and other applications. (C) 2020 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
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