Performance and Durability of Pt-Ni Catalysts Supported on Polypyrrole-Carbon for Fuel Cells
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Proton exchange membrane fuel cells are environmentally friendly energy conversion systems, but their performance is hampered by poor activity and durability of the catalyst. In the work presented herein, a PtNi catalyst supported on polypyrrole-carbon (PPy-C) was prepared using an electrochemical technique. The molecular structure of the PPy was analyzed by Fourier-transform infrared spectrometry. The surface morphology and structure of the catalysts were characterized by scanning electron microscopy and transmission electron microscopy. Cell polarization curves and impedance spectra showed that PtNi/PPy-C exhibited higher catalytic activity, which can be ascribed to the small size and uniform distribution of the PtNi nanoparticles. Linear sweep voltammetry measurements on a rotating disk electrode indicated that the oxygen reduction reaction kinetics on the surface of PtNi/PPy-C mainly followed a four-electron transfer pathway. The degradation of the performance of PtNi/PPy-C was slower than that of commercial Pt/C in accelerated durability testing. The weakened agglomeration effect during long-term operation is attributed to the corrosion resistance of the PPy carrier with high electrical conductivity. The composite carrier enhanced the catalytic activity and durability of the PtNi/PPy-C.
KeywordsFuel cells polypyrrole Pt-Ni catalyst durability PEMFC
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This work was financially supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions. Zelin Chen (Tianjin University) is gratefully acknowledged for technical support.
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