Abstract: The Pt/C-RuO₂ catalyst samples were prapared by deposition of hydrated RuO₂ on the carbon-supported Pt (Pt/C) catalyst. The cyclic voltammetry and multi-potential steps chronoamperometry results showed that the double layer capacitance of the catalyst samples increased after adding RuO₂. The test result of single cell for proton exchange membrane fuel cell (PEMFC) showed that, compared with the Pt/C catalyst, there was a slight loss in cell performance when the mass fraction of RuO₂ was lower than 8%. The result of voltage dynamic response to different current steps showed that the voltage of the Pt/C-RuO₂ catalyst single cell for PEMFC was more steady than that of Pt/C catalyst, which indicated that RuO₂ could buffer the voltage falling when the current increased instantly.

Key words: proton exchange membrane fuel cell, single cell, dynamic response, platinum, carbon, ruthenium oxide