Fe/N/S-composited hierarchically porous carbons with optimized surface functionality, composition and nanoarchitecture as electrocatalysts for oxygen reduction reaction

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1016/j.jcat.2017.05.011
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Name affiliation
  1. National Research Council of Canada. Energy, Mining and Environment
FormatText, Article
Journal titleJournal of Catalysis
ISSN0021-9517
1090-2694
Volume352
Pages208–217
SubjectFe/N/S-composited hierarchically porous; carbon; surface functionalities; oxygen reduction reaction; active-site formation and nature; fuel cells; metal-air batteries
Abstract
Non-precious Fe/N/S-composited hierarchically porous carbon materials (Fe(x)/N/S-PAD, PAD: poly(acrylamide-co-diallyldimethyl ammonium chlor), x: the weight ratio of FeSO4 7H2O/PAD) are synthesized using a facile silica colloid template approach with FeSO4 7H2O as Fe and S sources, and PAD as N source, respectively. A simultaneous creation of porous structures and surface functionalities (Fe, N and S) of such catalysts is realized just by simply tuning the weight ratio of FeSO4 7H2O and PAD in the synthetic precursors. As a result, a series of catalyst samples with high oxygen reduction reaction (ORR) activity/stability are obtained, demonstrating the promotion role of FeSO4/PAD ratio in synthesizing high-performing catalysts. Particularly, a catalyst (Fe(1.5)/N/S-PAD) with a trace Fe content down to 1.0 wt.% is tested to be superior to a commercial Pt/C catalyst in alkaline media and exhibits impressive ORR performance in acidic media. Combined with characterization results such as TEM, Raman spectra, BET and XPS analysis, it is found that the well-defined micro- and meso-porous structure play the key role in enhancing catalytic ORR performance rather than the final total N contents in the carbon. Regarding the stability of such a catalyst, test using cyclic voltammetry for 5000 cycles in O2-saturated solution shows a negligible degradation rate when compared with Pt/C one, suggesting that this catalyst could be used for catalyzing the high-performing cathode ORR in proton-exchange membrane fuel cells, alkaline fuel cells and metal–air batteries.
Publication date
PublisherElsevier
LanguageEnglish
Peer reviewedYes
NPARC number23002158
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