期刊
ELECTROCHIMICA ACTA
卷 161, 期 -, 页码 305-311出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.02.072
关键词
Fuel cells; Non-precious metal electrocatalysts; Vinazene; Methanol tolerance; Oxygen reduction reaction
资金
- KACST, through the Science & Technology Unit at KFUPM as part of the National Science, Technology and Innovation Plan (NSTIP) [10-ENE-1375-04]
- startup fund from the Hong Kong University of Science and Technology
The 2-vinyl-4, 5-dicyanoimidazole (Vinazene) was used as a nitrogen precursor to synthesize a promising non-precious metal (NPM) catalyst for oxygen reduction reaction (ORR). Vinazene together with an iron source was impregnated into a carbon matrix and pyrolyzed at 900 degrees C in N-2 atmosphere. The structure of the resulting Fe-N-C nanocomposite was analyzed by X-ray photoelectron spectroscopy, Raman spectroscopy and X-ray diffraction. Both rotating disk electrode (RDE) and rotating ring-disk electrode (RRDE) experiments showed excellent ORR activity for the obtained catalyst with low H2O2 formation (similar to 3.0%) in 0.1 M KOH. The catalyst was found to be rich in mesoporous structure along with high percentage of pyrrolic-N function with surface area of about 673 m(2) g(-1) and pore size of 4.2 nm. In addition to its excellent ORR activity, the catalyst showed remarkable tolerance towards methanol oxidation and demonstrates good stability over 10,000 potential cycles (0.6-1.0V Vs RHE). We believe that this N-rich Vinazene molecule will be beneficial to further development of nitrogen doped carbon electrocatalysts. (C) 2015 Elsevier Ltd. All rights reserved.
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