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以ITO导电玻璃为基体,采用恒电位沉积法制备了PtCo/石墨烯(GN)复合催化剂.通过扫描电镜(SEM),X射线能量散射谱(EDX)及电化学方法对催化剂进行了表征.SEM结果表明,石墨烯能够促进催化剂粒子的均匀分布,降低催化剂粒径;当Pt和Co物质的量之比为1∶2.93时,该催化剂粒径最小,分布最为均匀.电化学测试结果表明,石墨烯作为载体能够提高催化剂抗CO中毒性能,有利于对甲醇的催化氧化,这主要是由石墨烯优异的电子导电性和表面含氧活性基团所决定的.而且由于Co特殊的电子效应,它的加入也能够影响该催化剂的催化活性.结果证明,当Pt和Co物质的量之比为1∶2.93时,该复合催化剂表现出对甲醇氧化最为优越的催化性能,甲醇氧化峰电流密度可达到662A gpt-1,正反扫电流(If/Ib)比为2.34,是传统PtCo/C催化剂(If/Ib=1.32)的近1.8倍.
PtCo / graphene (GN) composite catalysts were prepared by potentiostatic deposition on ITO conductive glass substrate.The catalysts were characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and electrochemical methods The results show that graphene can promote the uniform distribution of catalyst particles and decrease the particle size of the catalyst. When the ratio of Pt to Co is 1: 2.93, the particle size of the catalyst is the smallest and the distribution is the most uniform. The electrochemical test results show that graphite Ethylene as a carrier can improve the catalyst anti-CO poisoning performance, is conducive to the catalytic oxidation of methanol, which is mainly determined by the excellent electronic conductivity of graphene and surface oxygen-containing active groups. And because of Co special electronic effects, it The catalytic activity of the catalyst can also be affected.The catalytic activity of the composite catalyst for methanol oxidation shows that when the ratio of Pt to Co is 1: 2.93, the catalytic oxidation peak current density of methanol can reach 662A gpt-1, the ratio of forward / reverse sweep current (If / Ib) is 2.34, which is nearly 1.8 times that of traditional PtCo / C catalyst (If / Ib = 1.32).