直接乙醇燃料电池阳极催化剂Pt-SnO2/C的制备及性能表征

Preparation and Characterization of Anodic Catalyst Pt-SnO2/C for Direct Ethanol Fuel Cells

采用水热反应法来制备不同浓度及不同反应时间的碳球，以葡萄糖为反应原料，在未添加任何模板剂的条件下，制备了尺寸可控的中空碳球为催化剂载体，加入自制的SnO2为助剂，运用微波辅助乙二醇还原氯铂酸法合成催化剂。利用扫描电镜（SEM）对所制备的碳球载体进行了表征，利用电化学工作站对所制备的催化剂进行了电化学性能测试。结果表明，碳球随葡萄糖溶液浓度的增长，碳球的粒径随之增大，其中0．5mol·L^-1，4h的碳球分散性最好，且粒径尺寸较小约为0．62μm；同时碳球随反应时间的增加，粒径增大，但反应时间过长会出现焦结粘着现象，从而降低催化剂的催化氧化性能；加入助剂SnO2合成的催化剂可显著提高乙醇的催化氧化的活性，稳定性和抗中毒能力。

Hydrothermal reaction method was used to prepare carbon spheres with different concentrations and different reaction time. Glucose was used as the reaction material. Without any templating agent, hollow carbon spheres with controllable size were prepared as catalyst carrier, and self-made SnO2 as co-catalyst was added to synthesize catalysts by microwave-assisted ethylene glycol reduction of chloroplatinic acid method. The prepared carbon spheres were characterized by scanning electron microscopy （SEM）. The electro- chemical properties of the prepared catalysts were tested by electrochemical workstation. The results showed that the diameter of carbon spheres increased with the concentration of glucose solution. Among them, 0.5 mol·L^-1 , 4 h carbon spheres had the best dispersibility and its particle size was smaller about 0.62 μm. At the same time, the size of carbon spheres increased with reaction time, but if the reaction time was too long, coking adhesion phenomenon would occur and catalytic oxidation performance of catalysts would be re- duced. The synthetic catalysts by adding SnO2 could significantly increase the catalytic oxidation activity, stability and resistance to poisoning of ethanol.