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时间:2020-03-27
《碳纳米管上原位沉积钯-钴-镍纳米颗粒及其对乙醇氧化的电活性.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第32卷第7期无机化学学报V0l_32No.72016年7月CHINESEJOURNALOFINORGANICCHEMISTRY1161—1169碳纳米管上原位沉积钯一钴一镍纳米颗粒及其对乙醇氧化的电活性陈清华1易清风’l12阳铮1周秀林1刘小平1聂会东1徐国荣1(湖南科技大学化学化工学院,湘潭411201)2理论有机化学与功能分子教育部重点实验室,湘潭411201)摘要:以水合肼为还原剂,在水和乙醇的混合溶液中制备多壁碳纳米管(MWCNT)~.载的纳米镍(Ni/MWCNT)~I纳米镍钴fNi.Co/MWC
2、NT)颗粒.然后将它们分别与氯化钯溶液反应.形成的钯纳米颗粒原位沉积在MWCNT表面,从而得到MWCNT负载的Pd.Ni/MWCNT和Pd—Ni—Co/MWCNT催化剂SEM和TEM图像显示.MWCNT上的催化剂颗粒是由5101113的小颗粒团聚而成的30~100nm的大颗粒.三金属催化剂的粒径比双金属的粒径小,在MWCNT上的分散度更高。ICP和EDS分析显示,Pd直接还原并包覆在纳米镍和纳米镍钴表面:采用循环伏安和计时电流技术,研究了催化剂在碱性溶液中对乙醇氧化的电催化活性,结果表明.Pd—Ni.Co/
3、MWCNT催化剂对乙醇氧化具有强的电催化活性,乙醇氧化对应的峰电流密度达101.8mA·am.并且催化剂催化活性稳定关键词:钯催化剂;乙醇氧化;镍纳米颗粒;燃料电池;原位还原中图分类号:O614.823文献标识码:A文章编号:1001—4861(2016)07.1161—09DoI:10.11862/CJIC.2016.163/nSituFormationofTernaryPd·-Ni--CoNanocatalystonMWCNTf0rEthanolElectro.oxidationinAlkalineMe
4、diaCHENQing—HuaYIQing—Feng,。YANGZhengZHOUXiu—LinLIUXiao-PingNIEHui-DongXUGuo—Rong(SchoolofChemhtryandChemicalEngineering,HunanUniversityofScienceandTechnology,Xiangtan,Hunan411201,China)(2KeyLaboratoryofTheoreticalOrganicChem~tryandFunctionMolecule,Min~tuo
5、fEducation,HunanUniversityofScienceandTechnology,Xiangtan,Hunan411201,China)Abstract:Ni/MWCNTandNiCo/MWCNTnanoparticleswerefirstlypreparedbychemicalreductionmethodwithhydrazineasreductantinamixturemediumofwaterandalcoholusingMuhi.walledcarbonnano.tubes(MWC
6、NTs)asthesupport.PdNi/MWCNTandPdNiC0/MWCNTcatalystswerethenpreparedthroughanin-situreductionbythereactionoftheNi/MWCNTandNiCo/MWCNTwiththeaqueousPdC1,solutionrespectively.SEMandTEMimagesshowthatthelargeaggregatesonthesurfaceofMWCNTswiththediameterof30—.100
7、nmarecomposedofsmallparticleswiththediameterof5~10nm.TheternaryPdNiCocatalystpresentsthesmallerdiameterthanPdNicatalyst,aswellasthebetterdispersityonMWCNT.ICPandEDSanalysesrevealthatPdnanoparticlesaredirectlyreducedandcoatedonthesurfaceofNiandNiConanoparti
8、cles.Theelectrochemicalactivityofthecatalyststowardsethanoloxidationinalkalinemediahasbeenexaminedbycyclicvoltammetry(CV)andchronoamperometryfCA)methods.PdNiCo/MWCNTcatalystpresentsananodicpeakcurrentdensityo
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