Journal
ELECTROCHIMICA ACTA
Volume 145, Issue -, Pages 259-269Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.08.091
Keywords
Mesoporous carbon material; N and S co-doping; Oxygen reduction reaction; Proton-exchange membrane fuel cell
Categories
Funding
- National Natural Science Foundation of China [21173039]
- Specialized Research Fund for the Doctoral Program of Higher Education, SRFD of China [20110075110001]
- Innovation Program of the Shanghai Municipal Education Commission [14ZZ074]
- International Academic Cooperation and Exchange Program of Shanghai Science and Technology Committee [14520721900]
- Graduate Thesis Innovation Fundation of Donghua University [EG2014015]
- College of Environmental Science and Engineering, State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai, China
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Nitrogen and sulfur co-doped mesoporous carbon materials are synthesized by pyrolyzing FeSO4+ poly (ethyleneimine) + template SiO2 mixture at a high temperature without additional dopant precursors. For post-treatment, acid leaching is used to remove the metal, and the heat-treatment is tailored to optimize the catalytic activity of the catalysts toward the oxygen reduction reaction (ORR) in acidic solution. Scanning electron microscopy, X-ray diffraction, low-temperature N-2 adsorption, X-ray photoelectron spectroscopy and inductively coupled plasma are used to characterize the catalysts' morphologies, structures, and compositions. Rotating disk electrode and rotating ring-disk electrode techniques are employed to quantitatively obtain the ORR kinetic constants and determine the reaction mechanisms. The ORR activity is highly improved by reheating the catalyst after H2SO4 leaching with improved half-wave potential of 0.68 V vs. RHE, and ORR electron number larger than 3.76. Moreover, increasing the catalyst loading of 800 mu g cm(-2) exhibits only 36 mV deviation from Pt/C. It is believed that the synergetic effect between the Fe-, N- and S-containing active sites and the modified carbon matrix structure due to H2SO4 leaching and reheating should make contribution to the high ORR activity. (C) 2014 Elsevier Ltd. All rights reserved.
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