Abstract
Phosphoric acid poisoning of catalysts in the cathode is a major performance degradation factor of high-temperature polymer electrolyte membrane fuel cells. Phosphoric acid is attached to the platinum surface and inhibits the ORR reaction. Thus, the surface treatment of Pt can block phosphoric acid. In this study, melamine is attached to the surface of commercial Pt/C at room temperature and pressure to form a melamine layer that can prevent phosphoric acid poisoning. The catalysts of various melamine concentrations were characterized by the optical method. In addition, an electrochemical evaluation was performed at a 1 M phosphoric acid concentration of the electrolyte. Catalysts with 20 mM or more of melamine attached to it form a sufficient melamine layer. These catalysts exhibited reduced performance loss in high concentrations of phosphoric acid electrolytes. In addition, an excessive amount of melamine layer at over 20 mM sample was beneficial to ORR activity in the high concentration of phosphoric acid.
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