PtRu/C纳米催化剂对乙醇的电氧化性能  

Electro-oxidation activity of ethanol on PtRu/C nanocatalyst

作　　者：乔芸[1] 褚有群[1] 陈赵扬[1] 马淳安[1] 

机构地区：[1]浙江工业大学绿色化学合成技术国家重点实验室培育基地,浙江杭州310032

出　　处：《浙江工业大学学报》2011年第3期247-251,共5页Journal of Zhejiang University of Technology

基　　金：国家自然科学基金资助项目(20476097);浙江省国际合作重大科技专项项目(2008C14040)

摘　　要：以商用炭黑Vulcan XC-72R为载体,硼氢化钠为还原剂,采用浸渍法制备了PtRu/C催化剂,采用XRD,TEM及HRTEM等手段对催化剂的晶体结构和粒径大小进行了表征.结果表明:采用浸渍法制备的PtRu/C催化剂和Pt/C催化剂均表现为Pt的fcc晶体结构;PtRu/C催化剂中的金属颗粒粒径小于Pt/C催化剂,其平均粒径约为4.3 nm,因而具有更大的反应表面积.用循环伏安,恒电位极化及CO溶出伏安法考察了上述两种催化剂对乙醇氧化的电催化性能.结果表明:相对于Pt/C催化剂而言,PtRu/C催化剂具有更强的抗CO中毒能力,对乙醇的氧化具有更高、更稳定的电催化性能,乙醇在PtRu/C催化剂电极上正向氧化反应的表观活化能为17.66 kJ/mol.The PtRu/C catalyst was prepared by the impregnation method using Vulcan XC-72R as the substrate and sodium borohydride as reductive agent.X-ray diffraction（XRD） analysis,transmission electron microscopy（TEM） and high-resolution transmission electron microscopy（HRTEM） were used to characterize the crystallinity and particle size of the catalyst.The results show that both the PtRu/C and Pt/C catalysts prepared by the same impregnation method have platinum fcc structure.Compared to the Pt/C catalyst,the PtRu/C catalyst exhibits high active specific surface area for its smaller metal particle size which is about 4.3 nm.The electrocatalytic activity of the two catalysts for ethanol electrooxidation were characterized by the cyclic voltrammetry,chronoamperometry and CO stripping voltammetry.It was found that the PtRu/C catalyst had stronger ability of anti-poisoning and also exhibited better and more stable electrocatalytic activity towards ethanol electrooxidation than Pt/C catalyst because of the addition of Ru.Kinetic analysis shows that the apparent active energy of the electrode process is 17.66 kJ/mol.

关 键 词：浸渍法 PTRU/C 乙醇 电氧化 

分 类 号：O646[理学—物理化学]