以紫外光还原法将氧化石墨(GO)还原成石墨烯(GN),同时将磷钼酸(PMo12)修饰到石墨烯上,形成磷钼酸功能化的石墨烯 PMo12-GN,并以此为基底利用电化学还原法制备了 Pd/PMo12-GN 复合膜催化剂。运用 X 射线粉末衍射、X射线光电子能谱、扫描电镜、透射电镜等对复合膜的组成、结构、形态进行表征,结果表明：实验成功制备了Pd/PMo12-GN复合膜催化剂,且Pd颗粒均匀分散在PMo12-GN基底上。采用CV、计时电流法、CO溶出伏安法、交流阻抗法等电化学方法研究了Pd/PMo12-GN复合膜的电催化性能。研究结果表明：制备的复合膜催化剂对甲酸氧化反应的催化活性、催化稳定性、抗CO毒化能力和电子传递能力显著优于商品化的 Pd/C催化剂。Pd/PMo12-GN 复合膜电催化性能的提高主要是由于 Pd 纳米颗粒在 PMo12-GN 基底上均匀分散,以及PMo12的强氧化能力从而使钯表面一氧化碳等中间产物能迅速氧化去除。
The Pd/PMo12-GN composite film was prepared by electrochemical reduction, in which GN prepared from GO reduction under UV irradiation and simultaneously functional embellished by PMo12. The as-prepared composite was characterized by X-ray diffraction, X-ray photoelectron spectroscope, scanning electron microscope and transmis-sion electron microscope. It was shown that Pd/PMo12-GN composite was successfully prepared and Pd particles were uniformly-dispersed with a small particle size on the PMo12-GN substrate. Cyclic voltammetry, chronoamperometric curves, CO-stripping curves and EIS were used to discuss the electrocatalytic activities of the Pd/PMo12-GN composite film. The results indicated that the as-prepared composite film presented better electrocatalytic activity, stability, CO tolerance ability, and electric conductivity towards formic acid oxidation as compared with commercial Pd/C catalyst. The enhancement in electrochemical performance of the Pd/PMo12-GN composite film can be attributed to the syner-gistic effect of highly dispersed Pd nanoparticles on the PMo12-GN substrate and higher oxidation power of PMo12 which promotes the removal of the poisonous species on the Pd surface.
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