Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5147700 | International Journal of Hydrogen Energy | 2016 | 10 Pages |
Abstract
To drive the Fe-based application for the Oxygen Reduction Reaction (ORR) in alkali media, this work found the Carbon Nanotube supported Fe-Polyaniline (Fe-PANI/CNT) catalyst from controlled Molecular Self-assembly (MS) method is comparable to the commercial Pt/C catalyst in mass current density and ORR stability, but with large gap on specific current density. This can be due to that the controlled MS method help establish the most active site of Fe-N coordination in the PANI pore, whose hydrophilic state inhibits O2 transfer and whose poor conductivity restricts O2 utilization jointly. In the meanwhile, we revealed that the enormous impact of OH adsorption (OHad) on ORR activity and stability, exhibiting negative results on the Pt/C catalyst but beneficial results for Fe-based catalysts, especially in the “indirect 2e+2e pathway” relating to the inner and outer-sphere electron transfer processes. All these progress facilitate the clarification for the structure-catalysis and encourage preparation towards controlled MS methods.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Kun-Ming Shi, Xing Cheng, Zhi-Yong Jia, Jian-Wei Guo, Cheng Wang, Jia Wang,