中文摘要：

用热分解法制备Ti/Pd2Sn＋Pd O和Ti/Pd电极。采用高分辨率透射电子显微镜、能量散射谱仪、选区电子衍射对催化剂进行表征。利用循环伏安法和计时电流法研究了所制备催化剂的催化活性和稳定性。结果表明,Ti/Pd2Sn＋Pd O电极比Ti/Pd电极具有更高的甲酸催化活性（约2.4倍）。Ti/Pd2Sn＋Pd O电极在0.3 V（vs SCE）下测试500 s后电流密度仅衰减25%,具有比Ti/Pd电极更好的稳定性。Ti/Pd2Sn＋Pd O电极显著提高了催化活性和稳定性,为Pd基直接甲酸燃料电池催化剂的应用提供可行方案。

英文摘要：

Nanoscale Ti / Pd2 Sn ＋ Pd O and Ti / Pd electrodes are prepared by a thermal decomposition method.The catalysts are characterized by high resolution transmission electron microscopy,energy dispersive spectrometer and selected area electron diffraction method.The activity and stability of the prepared catalysts were studied using cyclic voltammetry and chronoamperometry methods.The results show that Ti / Pd2 Sn ＋ Pd O electrode has much higher activity toward formic acid oxidation than that of Ti / Pd catalyst（ about 2.4 times）.In addition,the combination of Pd2 Sn and Pd O results in the high stability of Ti / Pd2 Sn ＋ Pd O electrode,which exhibits only 25% degradation of current density after being maintained at 0.3 V（ vs SCE） for 500 s.The significant improvement in the stability as well as activity of Ti / Pd2 Sn ＋Pd O electrode provides a promising solution for the instability of Pd-based catalysts for direct formic acid fuel cell application.