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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
Author(s) -
Lee Seonggyu,
Choun Myounghoon,
Ye Youngjin,
Lee Jaeyoung,
Mun Yeongdong,
Kang Eunae,
Hwang Jongkook,
Lee YoungHo,
Shin ChaeHo,
Moon SeungHyeon,
Kim SooKil,
Lee Eunsung,
Lee Jinwoo
Publication year - 2015
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201501590
Subject(s) - catalysis , electrode , oxygen reduction reaction , oxygen reduction , materials science , doping , membrane , fuel cells , metal , oxygen , inorganic chemistry , active site , clark electrode , chemical engineering , chemistry , electrolyte , electrochemistry , organic chemistry , optoelectronics , metallurgy , engineering , biochemistry
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.