炭载Pd-P催化剂对甲酸氧化的电催化性能

用黄磷作原料,制备了具有不同Pd-P原子比的碳载Pd-P(Pd-P/C)催化剂,并且使用X射线衍射(XRD)和能量色散X射线光谱仪(EDX)等手段对制备的催化剂进行了表征,总结了P含量对Pd-P合金纳米粒子的粒径和晶体结构的影响。电化学测试结果表明,甲酸在Pd/C、Pd₁P₆/C 和Pd₁P₈/C催化剂上,氧化峰峰电位由低到高依次为Pd₁P₆/C ﹤Pd₁P₈/C﹤Pd/C,电化学稳定性顺序为Pd₁P₆/C >Pd₁P₈/C>Pd/C,Pd₁P₆/C 催化剂对甲酸氧化的催化性能最佳,适量的P掺杂能够增强Pd/C催化剂对甲酸氧化的电催化活性和稳定性,因此,Pd-P/C催化剂是一类具有应用前景的直接甲酸燃料电池(DFAFC)阳极催化剂。

Electrocatalytic performance of the carbon supported Pd-P catalyst for formic acid oxidation

The Pd-P/C catalyst with the high content of P⁰ was successfully prepared with the organic impregnation-reduction method. Pd-P/C catalysts with different Pd/P atomic ratios were characterized by X-ray diffraction (XRD), Energy Dispersive X-ray Spectrometer (EDX). The effect of Pd-P/C catalysts with different Pd/P atomic ratios on the oxidation of formic acid was also demonstrated by several electrochemical measures. It was found that the potential of the anodic peak of formic acid at catalyst electrodes increased in the order of Pd₁P₆/C < Pd₁P₈/C < Pd/C, and the electrochemical stability of three electrodes was in the order of Pd₁P₆/C > Pd₁P₈/C > Pd/C. The Pd₁P₆ catalyst showed the best performance for the oxidation of formic acid. The Pd-P/C catalysts with the suitable atomic ratio of Pd and P had higher activity and stability for the oxidation of formic acid.