| Autor: |
Kang, Eunae, Lee, Jaeyoung, Lee, Young-Ho, Hwang, Jongkook, Lee, Eunsung, Choun, Myounghoon, Ye, Youngjin, Lee, Seonggyu, Mun, Yeongdong, Shin, Chae-Ho, Kim, Soo-Kil, Lee, Jinwoo, Moon, Seung-Hyeon |
| Předmět: |
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| Zdroj: |
Angewandte Chemie International Edition; Aug2015, Vol. 54 Issue 32, p9230-9234, 5p |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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