Journal
CARBON
Volume 106, Issue -, Pages 179-187Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2016.04.080
Keywords
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Funding
- Spanish Ministerio de Economia y Competitividad, MINECO [MAT2012-31651]
- Fondo Europeo de Desarrollo Regional (FEDER)
- FICYT Regional Project [GRUPIN14-102]
- Spanish Ministerio de Ciencia e Innovacion
- MINECO
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A simple, cost-effective and scalable approach for the synthesis of N-doped mesoporous carbons that are effective as ORR catalysts is reported. The synthesis procedure involves two steps: a) production of mesoporous carbons using a template-free approach based on the carbonization of citrate salts of zinc and calcium, and b) N-doping by heat treatment in the presence of melamine. The resulting N-doped carbon possess a high specific surface area, a porosity made up exclusively of mesopores and a large amount of nitrogen functionalities (similar to 8-9 wt%). When used as an electrocatalyst for the oxygen reduction reaction (ORR), the metal-free carbon materials predominantly catalyze the 4 e(-) process, with an onset potential of 0.9 V (vs. RHE) and a superior kinetic current density (similar to 17 mA cm(-2)) to that of Pt/C at similar to 0.6 V under basic conditions. In addition, the developed catalysts show a higher stability than commercial Pt/C and excellent electrocatalytic selectivity against methanol crossover. (C) 2016 Elsevier Ltd. All rights reserved.
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