Electrocatalytic activity of nitrogen doped carbon nanotubes with different morphologies for oxygen reduction reaction

被引：98
作者：
Chen, Zhu [1 ]
Higgins, Drew [1 ]
Chen, Zhongwei [1 ]
机构：
[1] Univ Waterloo, Dept Chem Engn, Waterloo Inst Nanotechnol, Waterloo Inst Sustainable Energy, Waterloo, ON N2L 3G1, Canada
来源：
ELECTROCHIMICA ACTA | 2010年 / 55卷 / 16期
基金：
加拿大自然科学与工程研究理事会;
关键词：
Oxygen reduction reaction; Nitrogen doped carbon nanotubes; Electrocatalytic activity; Morphologies; Fuel cells; MEMBRANE FUEL-CELL; FE-BASED CATALYSTS; NANOFIBER ELECTRODES; ALKALINE-SOLUTION; PH-DEPENDENCE; O-2; REDUCTION; ACID-MEDIA; ELECTROREDUCTION; PYROLYSIS; MECHANISM;
D O I：
10.1016/j.electacta.2010.03.057
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
Nitrogen doped carbon nanotubes (NCNTs) were synthesized by a single step chemical vapor deposition technique using either ferrocene or iron(II) phthalocyanine as catalyst and pyridine as the carbon and nitrogen precursor. Variations in surface morphology and electrocatalytic activity for oxygen reduction reaction (ORR) were observed between the NCNTs synthesized using different catalysts. The structural and chemical characterizations were carried out using transmission electron microscopy (TEM), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). The electrochemical activity of NCNTs was evaluated with rotating ring disc electrode (RRDE) voltammetry. Structural characterization suggested more defects formed on the NCNTs synthesized from ferrocene (Fc-NCNTs) which led to a rugged surface morphology compared to the NCNTs synthesized from iron(II) phthalocyanine (FePc-NCNTs). Based on the RRDE voltammetry study, Fc-NCNTs demonstrated much higher activity for ORR than FePc-NCNT. Evidences from the structural and chemical characterizations illustrate the potential impact of catalyst structure in shaping the surface structure of NCNTs and the positive effect of surface defects on ORR activity. These results showed that potential improvements on ORR activity of NCNTs could be achieved by tailoring the surface structure of NCNTs by using catalysts with different structures. (C) 2010 Elsevier Ltd. All rights reserved.
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页码：4799 / 4804
页数：6
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