期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 41, 期 46, 页码 21404-21414出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2016.07.264
关键词
PEM fuel cell; PtxCr/C catalyst; ORR activity; Stability
资金
- Ratchadapisek Sompoch Endowment Fund, Chulalongkorn University [Sci-Super II GF_58_08_23_01]
- Thailand Research Fund [IRG5780001]
- Chulalongkorn University Graduate School Thesis Grant
A series of PtxCr/C catalysts (where x is the Pt atomic number, equal to 1, 2, 3, 4 and 5) was prepared by impregnation-seeding technique for the oxygen reduction reaction (ORR). The effect of the Pt:Cr ratio (1:1 to 5:1) and the heat-treatment atmosphere (H-2 or N-2) on the ORR activity and stability were explored in an acid solution and in a PEM fuel cell under H-2/O-2 and H-2/air environments. The preliminary results demonstrated that increasing the Pt:Cr ratio increased the electrochemical surface area (ESA) of the catalyst, but decreased the degree of alloying. The heat treatment of the PtxCr/C catalyst under H-2 or N-2 environments induced an increased degree of alloying, but decreased the ESA as well as the formation of different catalyst morphologies, which consequently affected the ORR activity and stability of the PtxCr/C catalyst. In the absence of heat treatment, the Pt3Cr/C catalyst provided higher ORR activity and stability than Pt/C and other PtxCr/C catalyst. In the presence of heat treatment, the Pt3Cr/C(N-2) catalyst exhibited the highest ORR activity in both acid electrolyte and in PEM fuel cell at 60 degrees C and ambient pressure. It also provided the highest stability in the acid solution compared with the other PtxCr/C catalysts. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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