用不同络合剂制备的Pd-Sn/C催化剂在碱性溶液中对乙醇氧化的电催化性能

采用3种不同的络合剂柠檬酸三钠、 反式-1,2-环己二胺四乙酸·一水(C₁₄H₂₂N₂O₈·H₂O, CyDTA)和氨水]制备了3种Pd-Sn/C催化剂. 用X射线能量色散谱(EDS)、 X射线衍射谱(XRD)和透射电子显微镜(TEM)表征了3种催化剂的平均粒径、 形貌和组成. X射线光电子能谱(XPS)的测试结果表明, 3种催化剂表面存在Sn和SnO_x 2种状态. 电化学测试结果表明, 3种催化剂在碱性电解液中对乙醇氧化的电催化性能均优于商业化的Pd/C催化剂, 其中用CyDTA制备的Pd-Sn/C催化剂在碱性溶液中对乙醇氧化的电催化性能最好.

Electrocatalytic Performance of Pd-Sn/C Catalyst Prepared with Different Complexants for Ethanol Oxidation in Alkaline Solution†

Three complexants, sodium citrate, trans-1,2-diaminocyclohexane-N,N,N',N' -tetraacetic acid hydrate(C₁₄H₂₂N₂O₈·H₂O, CyDTA) and ammonia, were used to prepare Pd-Sn/C catalysts. It is found that the electrocatalytic performances of these three catalysts for ethanol oxidation in alkaline solution are better than commercialized Pd/C catalyst. The average particle diameter, morphology and composition of the Pd-Sn/C catalysts prepared were characterized by energy dispersive X-ray spectroscopy(EDS), X-ray diffraction(XRD) and transmission electron microscopy(TEM). X-ray photoclectron spectroscopy(XPS) measurement reveales that tin oxide and tin exist on the surface of the catalysts. The results of the electrochemical measurements indicate that the Pd-Sn/C-CyDTA catalyst has the best electrocatalytic performance for ethanol oxidation in alkaline solution.