采用浸渍还原法制备了Pt-Ru/C直接甲醇燃料电池阳极催化剂. 为了提高催化剂的活性,使用乙酸钠和氢氧化钠缓冲溶液来调节反应溶液的pH值,考察了缓冲溶液对催化剂性能的影响; 通过XRD和TEM技术对催化剂的晶体结构及微观形貌进行了分析; 并利用玻碳电极测试了催化剂在0.5 mol/L CH3OH和0.5 mol/L H2SO4混合溶液中的循环伏安曲线和阶跃电位曲线,考察了催化剂对甲醇阳极催化氧化活性的影响. 结果表明,用乙酸钠和氢氧化钠缓冲溶液调节反应溶液pH值所得催化剂的性能优于用NaOH调节反应溶液pH值所得的催化剂. 缓冲溶液pH值对催化剂性能有较大影响,使用pH值为12的缓冲溶液所制备的催化剂性能最佳, Pt-Ru颗粒在碳载体上分散均匀,其最小粒径为4.2 nm. 还原温度对缓冲溶液作用的发挥有一定影响,还原温度升高会使溶液的pH值下降,不利于缓冲溶液作用的发挥.
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