弱酸性介质中PdPAnPCE对甲酸的催化氧化.pdfVIP

弱酸性介质中Pd/PAn/PCE 对甲酸的催化氧化 廖超，廖明佳，谭瑶，唐容，季孟波，王耀琼，魏子栋* (重庆大学化学化工学院 重庆 400044 ，征文领域6) 摘要：采用恒电位聚合的方法在多孔碳电极上制得聚苯胺/多孔碳电极(PAn/PCE)电极，再采用脉冲电沉积 的方法将钯沉积到PAn/PCE 电极表面，制得Pd/PAn/PCE 电极。采用场发射扫描电子显微镜（FESEM ）观 察形貌，采用交流阻抗法研究了甲酸氧化过程中电极的动力学特征，采用计时电流法测试了电极的稳定性。 通过在甲酸溶液中进行线性扫描，并将Pd/PAn/PCE 电极与直接在多孔碳电极上电沉积钯制得的Pd/PCE 电 极比较发现：对于甲酸的氧化，Pd/PAn/PCE 电极比Pd/PCE 电极具有更高的活性, Pd/PAn/PCE 电极上甲酸 氧化电流的增加很可能是由于载体（PAn/PCE ）和催化剂（Pd ）之间存在协同作用。 关键词：Pd/PAn/PCE ；甲酸氧化；弱酸性介质 Pd/PAn/PCE catalyst for formic acid electrocatalytic oxidation in weak acidic medium LIAO Chao, LIAO Mingjia, TAN Yao ，TANG Rong, JI Mengbo, WANG Yaoqiong, WEI * Zidong (School of Chemical Engineering Chongqing University, Chongqing 400044, China) , Abstract: As we know, oxidation of small molecules such as methanol and formic acid in acidic medium requires the application of noble metals, generally platinum and/or its binary alloys and in alkaline medium will form carbonate precipitation which can decrease the oxidation efficiency. Moreover, there have been no reports on Pd catalysts studied in weak acid medium which can avoid the problems mentioned above to the best of our knowledge. Herein, the formic acid electro-oxidation was investigated on Pd/PAn(Polyanine)/PCE (Porous Carbon Electrode) in weak acid medium. Pd/PAn/PCE nanoparticles were successfully prepared by constant potential polymerization of polyanine (PAn) which was partially covered by Pd at room temperature. The morphology of the PAn/PCE and Pd/PAn/PCE were characterized by field emission scanning electron microscope (FESEM). The kinetic characterization of formic acid oxidation on Pd/PAn/PCE el