炭黑负载Pd-Co双金属催化剂对葡萄糖氧化的电催化性能

Electrocatalytic Performance of Carbon Black-supported Pd-Co Bimetallic Catalysts in Glucose Oxidation

采用硼氢化钠还原法,制备了炭黑负载的Pd及Pd Co双金属催化剂,研究了葡萄糖在不同催化剂上的氧化行为.通过X射线粉末衍射、透射电镜及X射线光电子能谱及电化学活性面积测定对催化剂进行了表征;利用循环伏安、及计时电流等电化学测试方法研究了Pd负载量及Pd/Co质量比对Pd-Co/C催化剂的葡萄糖电催化氧化活性与稳定性的影响.结果表明,当Pd的负载量为5%、Pd/Co质量比为3时,所得Pd_3Co_1/C催化剂对葡萄糖的电催化氧化活性与稳定性明显优于Pd/C催化剂,且单金属Co/C催化剂没有催化活性.钴助剂的引入提高了Pd的分散度,增大了电化学活性面积,从而提高了Pd的利用效率与催化性能.

A class of alloyed Pd-Co catalysts supported on carbon black are prepared by a sodium borohydride re- duction method. The electrooxidation of glucose on Pd/C and PdCo/C electrodes has been studied and compared. The Catalysts were characterized by X-ray diffraction （XRD）, transmission electron microscopy （TEM）, X-ray photoelectron spectroscopy （XPS） and electrochemical surface area （ECSA） ; The activity and stability for glucose electrocatalytic oxidation reaction were evaluated by cyclic voltammetry and chronoamperogram methods at room temperature. Effects of Pd load quality and Pd/Co ratio during the preparation on the activities and stabilities were studied. It was found that Pd-Co/C catalyst with the load of 5% of Pd and quality of Pd/Co ratio of 3 ： 1 showed the better catalytic activity and stability than the catalyst prepared under other conditions. This result clearly shows that Pd-Co/C catalyst has a good activity and stability for glucose electrocatalytic oxidation reaction in comparison to Pd/C. Single metal Co/C has no electrocatalytic activity for glucose. The results indicate that adding Co to Pd/C catalyst can improve obviously the dispersion of Pd particles and its electrochemical surface area, resulting the rich- palladium surface structure.