石墨烯-纳米钯复合材料对乙醇的电催化氧化研究  

Graphene-Pd Nanocomposites as Enhanced Electrocatalysts for Electro-oxidation of Ethanol

作　　者：郭盼[1] 谷宁[1] 王旭红[2] 韩志远[2] 于伶俊 崔荣静[2] 

机构地区：[1]河北师范大学化学与材料科学学院,河北石家庄050024 [2]常熟理工学院江苏省新型功能材料重点实验室、化学与材料工程学院,江苏常熟215500

出　　处：《分析科学学报》2014年第4期467-471,共5页Journal of Analytical Science

基　　金：国家自然科学基金(No.20905010);江苏省自然科学基金(No.BK20131191);苏州市科技发展计划(No.SYN201302);河北省自然科学基金(No.B2011205079);河北省教育厅科学研究基金(20052022)

摘　　要：采用新颖简便的液相氧化-热膨胀还原法制备出石墨烯（RGO）,然后用一步化学还原法使Pd纳米粒子负载到RGO材料上,得到分散均匀、催化性能稳定的石墨烯-钯（RGO-Pd）复合材料。通过X射线衍射（XRD）、透射电子显微镜（TEM）等表征手段对复合材料的形貌和结构进行了表征。结果显示,Pd纳米粒子成功负载到石墨烯载体上,且分散均匀,粒径3~5nm。通过循环伏安法、计时电流法等电化学方法进一步研究了RGO-Pd复合材料在碱性介质中对乙醇的催化性能,并与碳黑-Pd（VX-72-Pd）复合材料做对比,结果表明RGO-Pd复合材料的电化学催化性能明显优于碳黑-Pd复合材料,有望成为新型高效的直接醇类燃料电池（DAFCs）的电催化材料。Reduced graphene oxide （GO） was prepared from graphite powder by Hummers＇ liquid oxidation method,and then via thermal exfoliation. The graphene supporting Pd catalysts were prepared by a one-step chemical reduction method. X-ray diffraction（XRD）, scanning electron microscopy（SEM） and transmission electron microscopy（TEM） measurements were used to characterize the particle size and crystallinity of the catalysts. The results showed that the Pd nanoparticles were well dispersed on the surface of the graphene with particle sizes of 3-5 nm. Cyclic voltammetric（CV） and chronoamperometric experiments further exhibited their catalytic activity and the stability for the electro-oxidation of ethanol in alkaline media. It was found that the graphene-Pd composites had better catalytic activity than the VX-72-Pd catalysts toward ethanol oxidation in alkaline media, which could be applied as promising electro-catalysts for direct alcohol fuel cells（DAFCs）.

关 键 词：热膨胀 石墨烯-钯(RGO—Pd) 直接乙醇催化燃料电池 

分 类 号：O657.1[理学—分析化学]