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Synergistic Effects between Atomically Dispersed Fe-N-C and C-S-C for the Oxygen Reduction Reaction in Acidic Media
Umeå University, Faculty of Science and Technology, Department of Physics.
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2017 (English)In: Angewandte Chemie International Edition, ISSN 1433-7851, E-ISSN 1521-3773, Vol. 56, no 44, p. 13800-13804Article in journal (Refereed) Published
Abstract [en]

Various advanced catalysts based on sulfur-doped Fe/N/C materials have recently been designed for the oxygen reduction reaction (ORR); however, the enhanced activity is still controversial and usually attributed to differences in the surface area, improved conductivity, or uncertain synergistic effects. Herein, a sulfur-doped Fe/N/C catalyst (denoted as Fe/SNC) was obtained by a template-sacrificing method. The incorporated sulfur gives a thiophene-like structure (C-S-C), reduces the electron localization around the Fe centers, improves the interaction with oxygenated species, and therefore facilitates the complete 4e(-) ORR in acidic solution. Owing to these synergistic effects, the Fe/SNC catalyst exhibits much better ORR activity than the sulfur-free variant (Fe/NC) in 0.5m H2SO4.

Place, publisher, year, edition, pages
2017. Vol. 56, no 44, p. 13800-13804
Keywords [en]
doping, iron, oxygen reduction reaction, sulfur, synergistic effects
National Category
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:umu:diva-142266DOI: 10.1002/anie.201706602ISI: 000413314800047PubMedID: 28857381OAI: oai:DiVA.org:umu-142266DiVA, id: diva2:1163114
Available from: 2017-12-06 Created: 2017-12-06 Last updated: 2018-06-09Bibliographically approved

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Gracia-Espino, EduardoHu, GuangzhiWågberg, Thomas

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