摘要
Nanoporous Pd and binary Pd-Cu particles were prepared by a hydrothermal method using ethylene glycol as a reduction agent and they were directly immobilized on Ti substrates named as Ti-supported Pd-based catalysts. Their electrocatalytic activity for formic acid oxidation and oxygen reduction reaction （ORR） in alkaline media was examined by voltammetric techniques. Among the as-prepared catalysts, nanoPdslCu19/Ti catalyst presents the highest current density of 39.8 mA/cm2 at -0.5 V or 66.4 mA/cm2 at -0.3 V for formic acid oxidation. The onset potential of ORR on the nanoPdslCU19/Ti catalyst presents an about 70 mV positive shift compared to that on the nanoPd/Ti, and the current density of ORR at -0.3 V is 2.12 mA/cm2, which is 3.7 times larger than that on the nanoPd/Ti.
采用水热法,以乙二醇为还原剂,直接在钛基体上沉积纳米多孔Pd和Pd-Cu颗粒,制备钛基Pd及Pd-Cu电极材料,研究它们在碱性溶液中对甲酸氧化和氧还原反应(ORR)的电催化活性。结果表明,nanoPd_(81)Cu_(19)/Ti对甲酸氧化具有最大的稳定电流密度,说明Cu的加入极大地改善Pd对甲酸氧化的电活性。所制备的二元Pd-Cu催化剂对ORR的电催化活性均明显高于nanoPd/Ti。在nanoPd_(81)Cu_(19)/Ti电极上,ORR的起始电位相对于nanoPd/Ti电极正移了70 mV,在-0.3 V时ORR的电流密度为2.12 mA/cm^2,是在nanoPd/Ti电极上的3.7倍。
基金
Project(10JJ9003) supported by Hunan Provincial Natural Science Foundation and Xiangtan Natural Science United Foundation,China
Project(11K023) supported by Scientific Research Fund of Hunan Provincial Education Department,China
