Development of a highly active Fe N C catalyst with the preferential formation of atomic iron sites for oxygen reduction in alkaline and acidic electrolytes
- Development of a highly active Fe N C catalyst with the preferential formation of atomic iron sites for oxygen reduction in alkaline and acidic electrolytes
- 김지영; 배지환; 아사드; 바짓 알리; 멩준 공; 김민규; 안토니; 강용묵; 남경완
- Non-precious metal catalysts; Fuel cells; Fe N C; Oxygen reduction reaction; Site density
- Issue Date
- Journal of colloid and interface science
- VOL 596-157
- Nitrogen-doped porous carbons containing atomically dispersed iron are prime candidates for substituting platinum-based catalysts for oxygen reduction reaction (ORR) in fuel cells. These carbon catalysts are classically synthesized via complicated routes involving multiple heat-treatment steps to form the desired Fe-Nx sites. We herein developed a highly active Fe-N-C catalyst comprising of exclusive Fe-Nx sites by a simplified solid-state synthesis protocol involving only a single heat-treatment. Imidazole is pyrolyzed in the presence of an inorganic salt-melt resulting in highly porous carbon sheets decorated with abundant Fe-Nx centers, which yielded a high density of electrochemically accessible active sites (1.36 x 1019 sites g-1) as determined by the in situ nitrite stripping technique. The optimized catalyst delivered a remarkable ORR activity with a half-wave potential (E1/2) of 0.905 VRHE in alkaline electrolyte surpassing the benchmark Pt catalyst by 55 mV. In acidic electrolyte, an E1/2 of 0.760 VRHE is achieved at a low loading level (0.29 mg cm-2). In PEMFC tests, a current density of 2.3 mA cm-2 is achieved at 0.90 ViR-free under H2？O2 conditions, reflecting high kinetic activity of the optimized catalyst.
- Appears in Collections:
- KIST Publication > Article
- Files in This Item:
There are no files associated with this item.
- RIS (EndNote)
- XLS (Excel)
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.