有机溶胶法制备直接甲酸燃料电池用Pd/C阳极催化剂

Electrocatalytic Performance of Pd/C Catalyst Prepared with Organic Sol Method for Oxidation of Formic Acid

采用改进的有机溶胶法制备了用于直接甲酸燃料电池(DFAFC)中甲酸氧化的炭载Pd(Pd/C)催化剂。制备Pd/C催化剂时,以乙醇作溶剂,SnCl2作还原剂。控制溶剂的蒸发温度就能控制Pd/C催化剂中Pd粒子的平均粒径和相对结晶度。溶剂蒸发温度与Pd/C催化剂中Pd粒子的平均粒径和相对结晶度不成正比关系。在选择合适的溶剂蒸发温度时,能制得Pd粒子的平均粒径至6.5 nm和相对结晶度至2.85的Pd/C催化剂。比较了具有不同Pd粒子的平均粒径和相对结晶度的Pd/C催化剂对甲酸氧化的电催化性能。结果发现,Pd粒子的平均粒径小和相对结晶度低的Pd/C催化剂对甲酸氧化有好的电催化性能。

Carbon supported Pd （Pd/C） catalyst for the oxidation of formic acid in the direct formic acid fuel cell （DFAFC） was prepared with an improved organic sol method. When the Pd/C catalyst is prepared via the improved organic sol method with ethanol as the solvent and SnCl2 as the reductant, the procedure is simple and the cost is low. Especially, it was found that in this method, controlling the evaporation temperature of the solvent could control the average size and the relative crystallinity of the Pd particles in the Pd/C catalyst. The evaporation temperature of the solvent is not proportional to the average size and the relative crystallinity of the Pd particles in the Pd/C catalyst. When a suitable evaporation temperature is selected, the Pd/C catalyst with the average size as small as 6. 5 nm and the relative crystallinity as low as 2.85 of the Pd particles could be obtained. It was found that the Pd/C catalyst with smaller average size and lower relative crystallinity shows a high electrocatalytic performance for the oxidation of formic acid.