期刊
ELECTROCHIMICA ACTA
卷 330, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.135119
关键词
Intermetallic; Pt-Fe catalyst; Mo; Oxygen reduction reaction
资金
- National Natural Science Foundation of China [51774100, 51762006, 51964013, 51902108, 51864007]
- Guangxi Key Research and Development Program of Science and Technology [GUIKE AB17195065, AB17129011]
- Guangxi Natural Science Foundation [2018GXNSFBA281123, 2018GXNSFBA138061, 2018GXNSFBA138002]
- Guangxi Technology Base and Talent Subject [GUIKE AD18126001, AD19110134, AD19110119, AD19110028, AD17195084]
- Natural Science Foundation of Guangdong Province [2018A030313944]
- Fundamental Research Funds for the Central Universities, China [2018MS87]
Development of efficient and low cost oxygen reduction reaction (ORR) catalysts through a scalable production method plays a key role in promoting the wide application of fuel cells for electronic vehicles but remains a grand challenge. Here a practicable strategy is proposed for the synthesis of small particle size multimetallic Pt-based intermetallic nanoparticles (NPs) for enhancing ORR catalysis. Benefiting from the specific intermetallic architecture, small particle sizes (less than 5 nm), as well as the tuned electronic structure, the as-prepared supported Mo-PtFe NPs manifest distinct improvement in catalytic activity for ORR than commercial JM Pt/C catalyst in acid medium. The optimized Mo-PtFe/C-H delivers a remarkably increased mass activity of 0.78 A/mg(pt), displaying outstanding ORR catalysis among the recently reported PtFe-based intermetallic catalysts. Furthermore, the intermetallic Mo-PtFe/C-H exhibits enhanced catalytic stability with 94.07% retention of initial mass activity and integrity of intermetallic structure after 5000 cycles. A series of comparative experiments show that origin for the exceptional ORR catalysis of Mo-PtFe/C-H originates from the increased amount of catalytically active sites of the small-sized intermetallic NPs and the optimally weakened oxygen binding energy tuned by Mo. This work highlights the universal and scalable synthetic strategy for preparation of small particle size Pt-based intermetallic catalysts for effectively catalyzing ORR in fuel cells. (C) 2019 Elsevier Ltd. All rights reserved.
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