Nitrogen-doped carbon nanotubes with high activity for oxygen reduction in alkaline media

被引:120
作者
Li, Hui [2 ]
Liu, Hao [1 ]
Jong, Zoee [2 ]
Qu, Wei [2 ]
Geng, Dongsheng [1 ]
Sun, Xueliang [1 ]
Wang, Haijiang [2 ]
机构
[1] Univ Western Ontario, Dept Mech & Mat Engn, London, ON N6A 5B9, Canada
[2] Natl Res Council Canada, Inst Fuel Cell Innovat, Vancouver, BC V6T 1W5, Canada
关键词
Alkaline electrolyte; Alkaline hydrogen fuel cells; Catalyst; Metal-air battery; Nitrogen-doped carbon nanotube (NCNT); Oxygen reduction reaction (ORR); HIGH-AREA CARBON; ELECTROCHEMICAL PROPERTIES; CATALYSTS; ELECTROCATALYSIS; PERFORMANCE; MANGANITES; SOLUBILITY; KINETICS;
D O I
10.1016/j.ijhydene.2010.11.025
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Nitrogen-doped carbon nanotubes (NCNTs) were prepared using a floating catalyst chemical vapour deposition method. The multiwalled NCNT contains 8.4 at% nitrogen and has a dimension of 100 nm in the diameter and 10-20 nm in the wall thickness. The catalytic activity and durability of the NCNTs towards oxygen reduction reaction (ORR) were evaluated by cyclic voltammetry (CV) and rotating ring-disk electrode (RRDE) techniques in KOH solution. In addition, the effects of KOH concentration on several ORR performance indicators of the NCNT catalyst, such as the number of electrons transferred, the diffusion-limiting current density, the onset and half-wave potentials, were also examined in electrolytes of various KOH concentrations, ranging from 0.1 to 12 M. Experimental results show that NCNTs exhibited comparable activity for ORR in alkaline electrolyte as compared with commercially available Pt/C catalyst, and much higher activity than commercial Ag/C catalysts. In addition, the NCNTs showed good stability from the potential cycling test, and the concentration of KOH had significant impact on the ORR performance indicators of the NCNT catalysts. Crown Copyright (C) 2010 Published by Elsevier Ltd on behalf of Professor T. Nejat Vethoglu. All rights reserved.
引用
收藏
页码:2258 / 2265
页数:8
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