直接甲醇燃料电池三元催化剂PtRuCo/C的制备及其电化学性质

Preparation and Electrochemical Properties of Ternary Catalyst PtRuCo/C for Direct Methanol Fuel Cell

使用柠檬酸三钠作为稳定剂,硼氢化钠作为还原剂,用浸渍还原法制备了20%(w)Pt60Ru30Co10/C催化剂.利用透射电子显微镜(TEM)和X射线衍射(XRD)对催化剂进行了表征.考察了不同pH值对制备催化剂的催化甲醇氧化能力及稳定性的影响,并使用预吸附单层CO溶出方法研究了其抗中毒能力.结果表明,当pH=8时,制备的PtRuCo/C对甲醇氧化具有最高的催化活性,其催化活性远高于商业化的Pt50Ru50/C,同时催化剂的稳定性最好,高于商业化的Pt50Ru50/C的稳定性,而且预吸附单层CO的起始氧化电位比Pt50Ru50/C的明显负移.

Using sodium citrate as a stabilizer, sodium borohydride as a reductant, 20%（w） Pt60Ru30Co10/C catalyst was prepared by impregnating reduction. Transmission electron microscopy （TEM） and X-ray diffraction （XRD） were used to characterize the catalysts. We studied the catalytic activity and stability in a methanol solution at different pH values and pre-adsorbed CO monolayer stripping was used to investigate its anti-poisoning ability. The results showed that PtRuCo/C had the highest catalytic activity toward methanol at pH 8, and its catalytic activity and stability were much higher than that of commercial Pt50Ru50/C. Compared with Pt50Ru50/C, the pre-adsorbed CO monolayer oxidation potential showed a significant negative shift.