Angewandte Chemie - International Edition
Angewandte Chemie - International Edition
4 years ago

Synergistic Effects between Atomically Dispersed Fe−N−C and C−S−C for the Oxygen Reduction Reaction in Acidic Media

Synergistic Effects between Atomically Dispersed Fe−N−C and C−S−C for the Oxygen Reduction Reaction in Acidic Media
Thomas Wagberg, Le Wang, Hangjia Shen, Guangzhi Hu, Shaojun Guo, Eduardo Gracia-Espino, Xamxikamar Mamat, Sanshuang Gao, Jingyuan Ma, Jun Luo, Ketao Zang
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 4 e− 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 0.5 m H2SO4. A sulfur-doped Fe/N/C catalyst with much better activity in the oxygen reduction reaction (ORR) in 0.5 m H2SO4 solution than the sulfur-free variant was developed. The incorporated sulfur atoms reduce the electron localization around the iron centers, improve the interaction with oxygenated species, and therefore facilitate the complete 4 e− ORR in acidic solution.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201706602

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