期刊
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
卷 44, 期 6, 页码 4773-4783出版社
WILEY
DOI: 10.1002/er.5265
关键词
core-shell; H-2-induced thermal treatment; low-platinum; ORR; PtNi; C alloyed catalyst
资金
- China-Japan Key Science and Technology Cooperation Program [2018YFE0202003]
- Beijing Key Research and Development Program [Z181100004518004]
- Dalian Institute of Chemical Physics [2016131195, U1664259]
- National Natural Science Foundation of China [21773136, 21573122, 2016YFB0101208]
- National Key Research and Development Program of China
In the purpose of maximizing the utilization of noble metal Pt in oxygen reduction catalysts, we illustrate a synthesis method of preparing the low-platinum PtNi/C alloyed oxygen reduction reaction (ORR) catalyst, which is developed through the H-2-induced treatment to a glucose reduced PtNi/C alloy. After post-treatment with H-2/N-2 mixture gases, this catalyst displays excellent ORR catalytic activity and durability for the synergetic influences of electronic and geometry effects on catalysts during the alloying. Specifically, the as-prepared PtNi/C (350 degrees C-6 h) sample delivers preponderant ORR activity with only 53.5% Pt usage than the commercial Pt/C. The specific activity and mass activity are corresponding 7.49 times and 3.5 times to the commercial Pt/C. This catalyst exhibits excellent ORR catalytic activity after 10 000 potential cycles in acid, which benefits from the well alloyed core-shell structure of PtNi/C. H-2-induced thermal treatment has significant effects on the development of high performance low-platinum PtNi/C alloy catalyst, and plays the significant role in the formation of well-alloyed core-shell structures. The lowered d-band center is believed to facilitate ORR catalysis through weakening the adsorption of intermediate oxygen species on the alloyed Pt surface. Therefore, PtNi/C(350 degrees C-6 h) alloyed catalyst possesses outstanding ORR catalytic activity with much lower Pt loading.
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