| The proton exchange membrane fuel cell (PEMFC) possesses several highly advantageous features such as low operating temperature, quick startup, high energy density, and no pollution, which make PEMFC as the most promising and attractive candidate for electric vehicle power. However, operations of fuel cells in the application of these systems are dynamic, and the transient behavior happens when the loading changes. Transient operations may result in the oxidant starvation due to gas response rate lagging the loading rate, which will affect the durability and reliability of fuel cells further. The development of power assistance for PEMFC is, therefore, of great interest.RuO2 is supercapacitor material, which owns higher power capacity and easier preparation technology. In this paper, the Pt /C-RuO2 catalysts have been synthesized by depositing hydrated RuO2 on Pt/C, which include Pt/C-4%RuO2, Pt/C-8%RuO2, and Pt/C-12%RuO2.The cyclic voltammetry and multi-potential steps chronoamperomertry test showed that the double layer capacitance of the catalysts increased after being added RuO2.The single fuel cell performances test showed that if the weight percentage of RuO2 is lower than 8%, the performances reduced a little when the gas was humidified, while the performance increased when the gas was little humidified.The dynamic response of voltage in different current test show that the voltage of the single fuel cell with Pt /C -RuO2 catalysts were more steady than the one with Pt/C catalyst, which indicated that RuO2 can buffer the voltage over drop when the current increases instantly.
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