微波热处理对La-Ni-Pt纳米合金催化剂性质的影响  

Influence of microwave heat-treatment on properties of La-Ni-Pt nano-alloy catalysts

作　　者：杨书廷[1] 杨伟光[1] 尹艳红[1] 杨金鑫[1] 岳红云[1] 

机构地区：[1]河南师范大学化学与环境科学学院

出　　处：《材料热处理学报》2006年第5期22-25,共4页Transactions of Materials and Heat Treatment

基　　金：河南省重大科技攻关项目(0524250021;0324210007)

摘　　要：采用改进的多元醇还原法以乙二醇为反应介质、聚乙烯吡咯烷酮(PVP)为保护剂、水合肼为还原剂,制备出了AB5型La-Ni-Pt纳米合金催化剂。同时采用了液相微波高温高压热处理对样品进行合金化处理。并采用XRD、TEM、SEM研究了其对样品的晶相结构和微观形貌的影响。测量结果表明,与传统的高温固相热处理相比,液相微波热处理能在较低的温度400-600℃和较短的时间120s使样品合金化,同时并没有引起样品的晶粒和颗粒的明显长大。将微波热处理过的样品和未经微波热处理过的样品作为PEMFC阳极催化材料,进行电池性能比较,测试结果表明了经过微波热处理的样品其电催化性能得到较大的提高。AB_5-type La-Ni-Pt nano-alloy were prepared using modified polyol process with ethylene glycol,polyvinylpyrrolidone(PVP)and hydrazine as reaction medium,protective agent and reducing agent,respectively.Microwave liquid phase heat-treatment with high pressures was employed.The influence of microwave heat-treatment with high temperature and pressure on crystalline structure and morphology was evaluated by XRD,TEM and SEM.The results reveal that compared to conventional solid phase heat-treatment,the alloying of Pt with La and Ni can occur by microwave liquid phase heat-treatment at the low calcination temperature of 400-600℃ for 120s without significant growth of grains and particles of La-Ni-Pt nano-alloy.Used as anode materials,the sample with microwave heat-treatment shows high electrocatalytic activities,compared to the sample without microwave heat-reatment.

关 键 词：La—Ni—Pt纳米合金 微波热处理 阳极催化剂 

分 类 号：TM911[电气工程—电力电子与电力传动] TG156.99[金属学及工艺—热处理]