石墨烯基燃料电池催化剂制备、表征及性能地研究.pdf

石墨烯基燃料电池催化剂的制备、表征及性能研究摘要 20-3㈣9 83㈣9 Y 质子交换膜燃料电池(PEMFC)是一种能量密度高、绿色环保的发电方式。目前, PEMFC催化剂主要使用金属Pt,由于价格昂贵且效率不高,严重地阻碍了燃料电池的商业化应用。本论文通过合成新结构,更换新型载体,添加辅助催化剂,提高了 PEMFC催化剂的电催化性能。通过TEM、SEM、AFM、XRD、CV等方法,对催化剂的形貌、结构、物相组成、电化学性质进行了研究。结果表明: (1)以天然石墨()为原料,采用改进的Hummer法制得了氧化石墨烯(GO)。通过不同方法合成了Ag/石墨烯催化剂样品。研究了样品对肼和甲醛的电催化氧化活性。结果表明,Ag/石墨烯样品对电催化氧化甲醛和肼具有良好的活性。(2)通过冷冻干燥/蒸汽还原法合成了PV石墨烯催化剂。。研究了Pt/ 石墨烯样品对甲醇的电催化氧化活性及稳定性。结果表明,Pt/石墨烯催化剂样品对甲醇具有很高的电催化活性,稳定性良好。(3)、。、“石墨烯对甲醇的电催化氧化活性。结果表明,/ 石墨烯对甲醇具有很高的电催化活性,。.本论文创新之处:1、通过冷冻干燥/蒸汽还原法制备了Ag/石墨烯催化剂,对甲醛和肼具有很高的电催化活性。2、、,。关键词:燃料电池;催化剂;石墨烯;银;铂;金 PREPA毗气TION,CHARACTERIZATION AND PROPEI之TY OF ELECTROCATAI』ySTS GRAPHENE SUPPORTED 0N FOR FU吧L CELL ABSTRACT Proton exchange membrane fuelcell(PEMFC)is akind ofenvironment protected power generating mode withhigh energy ,the mainelectrocatalysts of PEMFCs are metallic platinum insufficientactivity andhigh costofPt, themajor mercialization dissertation,electrocatalyticactivity oftheelectrocatalysts forPEMFC was improved by preparing new structure,changing tonew supports and applying morphologies,structures,phases andelectrochemical properties ofthecatalysts have been investigated withscanning electronmicroscopy(SEM),transmission electronmicroscopy (TEM),atomic forcemicroscopy(AFM),X-ray diffraction(XRD)and cyclic voltammetry(CV).The mainpoints inthisdissertationaresummarized asfollows: (1)Graphene oxide(GO)was synthesized from naturalgraphiteby amodified Hummer’S catalysts were prepared via electrocatalyticactivity ofthecatalysts fortheoxidation ofhydrazine(N2I-h)and formaldehyde(HCHO)were resultsindicatedthatAg/Graphene catalysis showed excellentelectrocatalyticactivity for theoxidationofformaldehyde