Abstract
Development of low-cost cathode catalysts with both a high catalytic activity and durability is one of the great challenges for fuel cells. In this article, graphene cathode catalysts with a controllable platinum load between 4%-55% were obtained by pyrolyzing chloroplatinic acid on graphene at 480°C in argon atmosphere. The microstructure and morphology of the modified catalysts were characterized using scanning electron microscope and X-ray diffraction. Results showed that Pt particles were uniformly distributed on the layer of graphene. The electrochemical performance showed that with the increase of platinum content, oxygen reduction reaction (ORR) catalytic activity first increased and then decreased. Compared with the commercial Pt/C (20wt.% Pt) catalyst, the modified graphene catalyst (8wt.% Pt) in this paper has better ORR catalytic performance, durability and methanol resistance.
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