复合碳载体负载Pd催化剂的乙醇电氧化性能

Performances of a Hybrid Carbon Material Supported Pd Catalyst for Ethanol Electrooxidation

以石墨烯纳米片(GNP)和XC-72炭黑组成复合碳载体,制备了Pd/C-GNP催化剂,并考察了其乙醇电氧化性能.透射电子显微镜和X射线衍射分析结果表明,复合载体的采用改善了催化剂的结构,促进了Pd纳米粒子的分散.电化学测试结果表明,Pd/C-GNP催化剂具有较大的电化学活性表面积;在碱性介质中,Pd/C-GNP催化剂的乙醇氧化活性显著高于Pd/GNP和Pd/C催化剂;Pd/C-GNP催化剂还表现出优良的抗中毒能力,这可能得益于Pd/C-GNP催化剂中金属-载体的相互作用.

A novel Pd/C-GNP catalyst was prepared using a hybrid carbon support composed of graphene nanoplatelets（GNP）and carbon black,and the performances of the catalyst for ethanol electrooxidation in alkaline media were evaluated.Transmission electron microscopy（TEM）and X-ray diffraction（XRD）measurements showed that the structure of the catalyst was improved and the dispersion of the Pd nanoparticles was facilitated by using the hybrid carbon support.Electrochemical measurements showed that the Pd/C-GNP catalyst had a high electrochemical active surface area.The ethanol-oxidation activity of Pd/C-GNP was remarkably higher than that of Pd/GNP and Pd/C in alkaline media.In addition,Pd/C-GNP exhibited an improved poison resistance and a high electrochemical stability,which could be attributed to the interaction between Pd nanoparticles and the carbon support.