期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 189, 期 -, 页码 1-11出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2016.02.009
关键词
Oxygen reduction reaction; S-N doped ordered mesoporous carbon; Electrocatalytic activity; Methanol tolerance; Stability
资金
- Sino-Greek Science and Technology Cooperation Project [2013DFG62590]
- National Natural Science Foundation of China [21576299, 21576300, 21276290]
- Guangdong Province Nature Science Foundation [2014A030313150]
- Ministry of Education and Science of the Russian Federation [14.Z50.31.0001]
Despite nitrogen doped carbon (N-C) materials as metal-free electrocatalysts for oxygen reduction reaction (ORR) have shown desirable performance, the state-of-the-art of N-C materials is still far from satisfaction for practical fuel cell applications. In the present work, sulfur (S) and nitrogen (N) dual doped ordered mesoporous carbon (SN-OMC) materials are for the first time successfully obtained by the aid of a convenient method under the same conditions, using polythiophene (PTh) and polypyrrole (PPy) as the precursors, ordered mesoporous silica (SBA-15) as the hard template, and FeCl3 as the catalyst. The preparation conditions of the adopted method are gentle and easy to control and regulate. The experimental results have demonstrated that the obtained materials possess high ordering degree, large specific surface area and adjustable sulfur and nitrogen contents. It is found that the S1N5-OMC (the PTh/PPy feeding volume ratio is 0.5:2.5) exhibits excellent ORR electrocatalytic activity in alkaline media with desirable current density, methanol tolerance and long-term stability. Such excellent performance could be attributed to the synergistic effect between S and N, the high density of catalytic sites for ORR provided by high S-N heteroatoms loading, and the excellent mass transfer benefiting from ordered mesoporous pore structure. The present investigation provides a new approach to prepare S and N dual doped mesoporous carbons, which show great potential to be applied as fuel cell cathode electrocatalysts. (C) 2016 Elsevier B.V. All rights reserved.
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