【摘要】 为了提高直接乙醇燃料电池阳极催化剂的催化活性,降低贵金属载量,采用热还原法制备了Pt-Ru-W/C催化剂,比较了Pt-Ru-W/C和相同前驱体用化学还原法制备的Pt-Ru/C催化剂对乙醇的电催化氧化行为;在0.5mol/L乙醇和0.5mol/L硫酸混合溶液中考核了上述催化剂对乙醇电催化氧化活性;通过X射线衍射光谱法(XRD)技术对催化剂的晶体结构进行了分析;结果表明:两种催化剂都具有Pt的面心立方晶格结构,晶格参数都小于Pt/C催化剂;计算表明Pt-Ru-W/C粒径较小,为6.5nm左右;Pt-Ru-W/C电化学活性比表面积小于Pt-Ru/C催化剂,但由于W的助催化作用使Pt-Ru-W/C对乙醇的电催化活性和抗乙醇中间产物毒化的能力高于Pt-Ru/C催化剂。更多还原

【Abstract】 In order to increase the activity of anodic catalysts and thus to lower noble metal loading in anodes for ethanol electrooxidation.Direct ethanol fuel cell anodic catalysts,Pt-Ru-W/C,was prepared by thermal reduction.The Pt-Ru/C catalyst prepared by chemical reduction of H2PtCl6 and RuCl3 as precursors was used to compare.Their performances of catalysts were tested through cyclic voltammetric curves and chronoamperometric curves in a solution of 0.5 mol/L CH3CH2OH and 0.5 mol/L H2SO4.The particle sizes and their structures of the catalysts were determined by means of X-ray diffraction(XRD).XRD analysis shows that both catalysts exhibit face-centered cubic structures and have smaller lattice parameters than Pt-alone catalyst.The particle size of Pt-Ru-W/C catalyst is relatively small,about 6.5 nm.The electrochemically active specific area of Pt-Ru-W/C catalyst is less 20 m2/g than that of the Pt-Ru/C.But,the catalytic activity of the Pt-Ru-W/C catalyst for ethanol electrooxidation is better than that of the Pt-Ru/C due to the promoting function of W.Its tolerance performance to CO from intermediates of ethanol electrooxidation is better than that of the Pt-Ru/C.更多还原