铁前驱体对FeN/ZIF-8催化剂氧还原活性的影响  

Effect of iron precursors on oxygen reduction reaction activity of FeN/ZIF-8 catalysts

作　　者：郑秋燕 杨智[1] 李茂辉 潘廷仙 秦好丽[1,2] 田娟 ZHENG Qiu-yan;YANG Zhi;LI Mao-hui;PAN Ting-xian;QIN Hao-li;TIAN Juan(School of Chemistry and Materials Science,Guizhou Normal University,Guiyang 550001,China;Key Laboratory of Functional Materials and Chemistry of Guizhou Province,Guiyang 550001,China)

机构地区：[1]贵州师范大学化学与材料科学学院,贵阳550001 [2]贵州省功能材料化学重点实验室,贵阳550001

出　　处：《材料工程》2021年第6期132-139,共8页Journal of Materials Engineering

基　　金：国家自然科学基金(21965006,21506041);贵州省科学技术基金(黔科合JZ字[2015]2007号);贵州省普通本科高等学校科技拔尖人才支持项目(黔教合KY字[2016]063);中国科学院燃料电池及复合电能源重点实验室开放课题(KLFC201703)。

摘　　要：近年来,ZIF-8因具有比表面积大、孔道结构规则等优点而被用作氧还原催化剂载体。以ZIF-8为载体,1,10-菲啰啉为氮源,分别以FeSO_(4)·7H_(2)O,FeAc,FeCl_(3)·6H_(2)O和FeC_(10)H_(10)为铁前驱体制备阴极氧还原催化剂,考察不同铁前驱体对FeN/ZIF-8催化剂结构及性能的影响。使用X射线衍射、比表面积和孔径分布测试、透射电子显微镜、热重分析等方法对催化剂的结构、形貌及催化剂前驱体的热性质等进行表征,使用线性扫描伏安法对催化剂的氧还原活性进行测试。结果表明:以FeSO_(4)·7H_(2)O为铁前驱体制备的催化剂,其起始电位约为0.93 V,氧还原反应为4电子过程,具有更好的氧还原催化活性;其在制备过程中形成的适中的比表面积及孔径大小,较好的晶型结构及较均匀的颗粒分散情况,且X射线衍射结果表明催化剂中存在少量的Fe_(3)C,这是其具有较好的氧还原催化活性的可能原因。ZIF-8 attracted more attention as the carbon support for oxygen reduction reaction catalyst due to its large specific surface area and regular pore structure in recent years.A series of FeN/ZIF-8 catalysts were prepared using ZIF-8,1,10-phenanthroline as carbon and nitrogen precursor,as well as FeSO_(4)·7H_(2)O,FeAc,FeCl_(3)·6H_(2)O and FeC_(10)H_(10) were used as different iron precursors,respectively.The influence of different iron precursors on the structure and oxygen reduction reaction(ORR)activities of FeN/ZIF-8 catalysts were investigated by X-ray diffraction,specific surface area and pore size distribution measurements,transmission electron microscope,thermogravimetric analysis,and linear sweep voltammetry.The results show that the catalyst prepared with FeSO_(4)·7H_(2)O as iron precursor has the initial potential of about 0.93 V,and the ORR is a four-electron process,which has better oxygen reduction catalytic activity.Moderate specific surface area and pore size distribution,good crystal structure and uniform particle dispersion,as well as the presence of Fe_(3)C are the possible reasons of resulting in better ORR activity of FeN/ZIF-8 with FeSO_(4)·7H_(2)O as the iron precursor.

关 键 词：氧还原反应 ZIF-8 FeN/ZIF-8催化剂 铁前驱体 催化活性 

分 类 号：O643[理学—物理化学]