期刊
JOURNAL OF POWER SOURCES
卷 520, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2021.230819
关键词
Electrocatalysis; Fe-N-C catalyst; Mesoporous carbon; Nitrogen doping; Oxygen reduction reaction; Proton-exchange membrane fuel cell
资金
- Estonian Research Council [PRG723, PRG4, MOBJD671]
- M-ERA.Net project CMOF.cell [SLTKT20445]
- EU through the European Regional Development Fund [TK141, TK134]
- US DOE EERE [DE-EE0008419]
- Oak Ridge National Laboratory SEED project Single-Atom Catalysts for CO2 Conversion [10609]
- US Office of Naval Research [N00014-18-1-2127]
The new PGM-free PEMFC cathode catalyst materials synthesized using the VariPore (TM) method by Pajarito Powder, LLC show high activity and stability, with mesoporous structure facilitating an effective reaction path.
A new platinum group metal (PGM)-free proton exchange membrane fuel cell (PEMFC) cathode catalyst materials, synthesized using the VariPore (TM) method by Pajarito Powder, LLC, are characterized for their structure and activity. The physico-chemical analysis of the iron-nitrogen-carbon (Fe-N-C) electrocatalysts show mesoporous carbon material effectively doped with iron and nitrogen. The materials have an average pore size of 78 nm and high specific surface area. The Fe-N-C catalysts exhibit good oxygen reduction reaction (ORR) activity in 0.5 M H2SO4 electrolyte with high half-wave potential and sustainable electrochemical stability over 10,000 repeated potential cycles with insignificant losses in their activities. As cathode catalysts in a PEMFC, the Fe-N-C materials deliver remarkably good fuel cell performance at low overpotential approaching that of the commercial Pt catalyst. The high ORR electrocatalytic activity of these Fe-N-C catalysts is credited to the synergy between nitrogen-moieties, specifically pyrrolic-N, pyridinic-N, and graphitic-N, and iron in addition to the high mesoporosity that facilitate an effective reaction path in boosting the electrocatalytic activity and stability.
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