Designing a Highly Active Metal-Free Oxygen Reduction Catalyst in Membrane Electrode Assemblies for Alkaline Fuel Cells: Effects of Pore Size and Doping-Site Position

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To promote the oxygen reduction reaction of metal-free catalysts, the introduction of porous structure is considered as a desirable approach because the structure can enhance mass transport and host many catalytic active sites. However, most of the previous studies reported only half-cell characterization; therefore, studies on membrane electrode assembly (MEA) are still insufficient. Furthermore, the effect of doping-site position in the structure has not been investigated. Here, we report the synthesis of highly active metal-free catalysts in MEAs by controlling pore size and doping-site position. Both influence the accessibility of reactants to doping sites, which affects utilization of doping sites and mass-transport properties. Finally, an N,P-codoped ordered mesoporous carbon with a large pore size and precisely controlled doping-site position showed a remarkable on-set potential and produced 70% of the maximum power density obtained using Pt/C.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2015-08
Language
English
Article Type
Article
Citation

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, v.54, no.32, pp.9230 - 9234

ISSN
1433-7851
DOI
10.1002/anie.201501590
URI
http://hdl.handle.net/10203/245031
Appears in Collection
CBE-Journal Papers(저널논문)
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