Pt/C-RuO2催化剂对提高质子交换膜燃料电池动态响应性能的作用

通过溶胶混合法将超级电容器材料RuO2负载到Pt/C上,制成了Pt/C-RuO2催化剂,并用这种催化剂组装成质子交换膜燃料电池(PEMFC)单电池,测试了其循环伏安曲线和多电位阶跃计时电流.结果表明,加入RuO2之后,催化剂的双电层电容明显增大.单电池的放电曲线测试结果表明,在加入少量RuO2(w≤8%)的情况下,单电池的性能略有降低.通过单电池在不同电流下电压动态响应和对脉冲电流的动态响应测试,表明在加入RuO2之后,单电池电压的瞬间衰减明显减缓.这说明RuO2具有在瞬间加大电流负载时缓冲电池电压的作用,即以Pt/C-RuO2为催化剂的PEMFC单电池的动态响应性能大幅度提高.

Effect of Pt/C-RuO2 on Improvement of Dynamic Response of Proton Exchange Membrane Fuel Cells

The Pt/C-RuO_2 catalyst samples were prapared by deposition of hydrated RuO_2 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 RuO_2. 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 RuO_2 was lower than 8%. The result of voltage dynamic response to different current steps showed that the voltage of the Pt/C-RuO_2 catalyst single cell for PEMFC was more steady than that of Pt/C catalyst, which indicated that RuO_2 could buffer the voltage falling when the current increased instantly.