Citation: FAN Ren-Jie, LIN Rui, HUANG Zhen, ZHAO Tian-Tian, MA Jian-Xin. Preparation and Characterization of Pt Catalysts Supported on Cobalt-Polypyrrole-Carbon for Fuel Cells[J]. Acta Physico-Chimica Sinica, ;2014, 30(7): 1259-1266. doi: 10.3866/PKU.WHXB201405045
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Pt/cobalt-polypyrrole-carbon (Co-PPy-C)-supported catalysts were successfully prepared by pulse-microwave assisted chemical reduction. Transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD) techniques were used to characterize the catalyst microstructure and morphology. The electrocatalytic performance, kinetic characteristics of the oxygen reduction reaction (ORR), and durability of the catalysts were measured by cyclic voltammetry (CV) and linear sweep voltammetry (LSV) techniques. It was found that the particle size of Pt/Co-PPy-C was about 1.8 nm, which was smaller than that of commercial Pt/C (JM) catalysts (2.5 nm). The metal particles were well-dispersed on the carbon support. The electrochemical specific area (ECSA) of Pt/Co-PPy-C (75.1 m2· g-1) was much higher than that of Pt/C (JM) (51.3 m2·g-1). The results of XPS showed that most of the Pt in the catalysts was in the Pt(0) state, and XRD results showed that the form of Pt was mainly the facecentered cubic lattice. The Pt/Co-PPy-C catalyst had the same half-wave potential as Pt/C (JM) and showed higher ORR activity. The Pt/Co-PPy-C catalyst proceeded by an approximately four-electron pathway in acid solution. After 1000 cycles of CV, the ECSA attenuation rates of Pt/Co-PPy-C and Pt/C were 13.0% and 24.0% respectively, which means that the Pt/Co-PPy-C catalyst has higher durability. The high performance of Pt/Co-PPy-C makes it a promising catalyst for proton exchange membrane fuel cells.
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