铁基氮掺杂碳纳米管制备及其电催化性能

利用化学原位聚合法制备聚吡咯包覆碳纳米管,然后以硫酸亚铁铵盐为铁前驱体,采用液相沉淀法制备聚吡咯-碳纳米管-铁化合物复合材料（Fe-PPy-CNTs）,通过对复合材料Fe-PPy-CNTs热处理,成功制备出铁基氮掺杂碳纳米管催化剂Fe NCNTs.X射线衍射分析表明,热处理使Fe-PPy-CNTs复合物中Fe3O4向Fe3N和Fe转化,700°C热处理制备的Fe NCNT700中铁主要是Fe3O4相,但也有Fe相.800和900°C热处理制备的催化剂Fe NCNT800和Fe NCNT900则明显有Fe3N和Fe形成.随着热处理温度升高,Fe NCNTs催化剂氮含量降低,其含氮官能团也由吡咯型...

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Bibliographic Details
Published in物理化学学报 Vol. 31; no. 3; pp. 498 - 504
Main Author 李莉香 赵宏伟 许微微 张砚秋 安百钢 耿新
Format Journal Article
LanguageChinese
Published 辽宁科技大学化学工程学院，辽宁鞍山114051 2015
辽宁科技大学材料电化学研究所，辽宁鞍山114051%辽宁科技大学化学工程学院,辽宁鞍山,114051
Subjects
氧还原
氮掺杂
电催化
碳纳米管
铁
Carbon nanotube
铁
Electrocatalysis
Oxygen reduction
Nitrogen doping
氮掺杂
碳纳米管
氧还原
Iron
电催化
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ISSN1000-6818
DOI10.3866/PKU.WHXB201412162

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Summary:利用化学原位聚合法制备聚吡咯包覆碳纳米管,然后以硫酸亚铁铵盐为铁前驱体,采用液相沉淀法制备聚吡咯-碳纳米管-铁化合物复合材料（Fe-PPy-CNTs）,通过对复合材料Fe-PPy-CNTs热处理,成功制备出铁基氮掺杂碳纳米管催化剂Fe NCNTs.X射线衍射分析表明,热处理使Fe-PPy-CNTs复合物中Fe3O4向Fe3N和Fe转化,700°C热处理制备的Fe NCNT700中铁主要是Fe3O4相,但也有Fe相.800和900°C热处理制备的催化剂Fe NCNT800和Fe NCNT900则明显有Fe3N和Fe形成.随着热处理温度升高,Fe NCNTs催化剂氮含量降低,其含氮官能团也由吡咯型氮向吡啶型和石墨型氮转化.电化学分析表明,含有Fe3N的Fe NCNT800和Fe NCNT900催化剂具有明显的氧还原催化活性,其中,Fe NCNT800因其具有高的比表面积、高的氮含量和高比例的有利于增强氧吸附能力和弱化O―O键的石墨氮官能团,而表现出优于Fe NCNT900氧还原催化活性及稳定性.
Bibliography:11-1892/06
Polypyrrole coated carbon nanotubes（PPy/CNTs） were synthesized by the in-situ chemical polymerization of pyrroles on CNTs. Iron compounds were deposited on the PPy/CNTs to form an Fe-PPy-CNTs composite using ferrous ammonium sulfate as the iron precursor by liquid phase precipitation. Catalysts wherein iron-based compounds were loaded onto nitrogen doped CNTs（Fe NCNTs） were prepared by heat treatment of the composites. X-ray diffraction（XRD） analysis shows that the heat treatment of Fe-PPy-CNTs caused the Fe3O4 in the composite to convert to Fe3 N and Fe. The Fe NCNT700 prepared at 700 °C contains Fe3O4 and Fe.We conclusively show that in both Fe NCNT800 and Fe NCNT900 that were prepared at 800 and 900 ° C,respectively, Fe3 N and Fe formed. With an increase in temperature the total amount of nitrogen in the Fe NCNTs decreases and the nitrogen containing functional groups convert from pyrrolyic-N to pyridinic-N and graphiticN. Electrochemical analyses show that the Fe NCNT800 and Fe NCNT900 that cont
ISSN:1000-6818
DOI:10.3866/PKU.WHXB201412162