电化学2017，Vol.23Issue(6)：708-717,10.DOI:10.13208/j.electrochem.161104
Pd/Fe3O4-C催化剂对甲醇、乙醇和丙醇氧化的电催化活性
Electroactivities of Pd/Fe3O4-C Catalysts for Electro-Oxidation of Methanol, Ethanol and Propanol
摘要
Abstract
Development of palladium (Pd) catalysts with high electroactivity for alcohol oxidation is significant for alcohol fuel cells.In this work,Pd nanoparticles were formed by sodium borohydride (NaBH4) reduction method and subsequently deposited on the surface of carbon supported ferriferrous oxide (Fe3O4/C) composite to obtain the Pd/Fe3O4-C catalysts with different Fe3O4 loadings.Their transmission electron microscopic (TEM) images show that the Pd nanoparticles were uniformly dispersed on the Fe3O4/C.Electroactivities of the prepared Pd/Fe3O4-C catalysts towards oxidation of C1-C3 alcohols (methanol,ethanol,n-propanol and iso-propanol) in alkaline media were investigated by cyclic voltammetry (CV),chronoamperometry and electrochemical impedance spectroscopy.Among the prepared catalysts (Pd/Fe3O4(2％)-C,Pd/Fe3O4(5％)-C,Pd/Fe3O4(10％)-C and Pd/C),the Pd/Fe3O4(5％)-C catalyst presented the highest electro-oxidation current density for oxidation of C1-C3 alcohols.According to the CV data,the anodic peak current densities for oxidation of methanol,ethanol,n-propanol and iso-propanol on the Pd/Fe3O4(5％)-C catalyst were over 1.7,1.4,1.7 and 1.3 times larger than that on the Pd/C catalyst,respectively.Furthermore,the charge transfer resistance of ethanol oxidation on the Pd/Fe3O4(5％)-C catalyst was much lower than that on the Pd/C catalyst.For all of the prepared catalysts,the decreases in electro-oxidation current density of the tested C1-C3 alcohols followed the order of n-propanol ＞ ethanol ＞ methanol ＞ iso-propanol.In addition,the presence of Fe3O4 nanoparticles in the carbon powder improved the electrochemical stability of the Pd nanoparticles.关键词
钯催化剂/Fe3O4/醇氧化/电催化Key words
Pd catalyst/Fe3O4/alcohol oxidation/electrocatalyst分类
化学化工引用本文复制引用
邹涛,易清风,张媛媛,刘小平,徐国荣,聂会东,周秀林..Pd/Fe3O4-C催化剂对甲醇、乙醇和丙醇氧化的电催化活性[J].电化学,2017,23(6):708-717,10.基金项目
This work was financially supported by the National Natural Science Foundation of China (No.21376070) and the Hunan Provincial Natural Science Foundation of China (No.14JJ2096). （No.21376070）
