Novel carbon-supported Fe-N electrocatalysts synthesized through heat treatment of iron tripyridyl triazine complexes for the PEM fuel cell oxygen reduction reaction |
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Authors: | Cicero WB Bezerra Lei Zhang Hansan Liu Zheng Shi Edmar P Marques Jiujun Zhang |
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Affiliation: | a Institute for Fuel Cell Innovation, National Research Council of Canada, Vancouver, BC, Canada V6T 1W5 b Department of Chemistry, Universidade Federal do Maranhão, Av. dos Portugueses, S/N 65.080-040 São Luís, MA, Brazil c Department of Technology Chemistry, Universidade Federal do Maranhão, São Luís, MA, Brazil |
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Abstract: | 2,4,6-Tris(2-pyridyl)-1,3,5-triazine (TPTZ) was used as a ligand to prepare iron-TPTZ (Fe-TPTZ) complexes for the development of a new oxygen reduction reaction (ORR) catalyst. The prepared Fe-TPTZ complexes were then heat-treated at temperatures ranging from 400 °C to 1100 °C to obtain carbon-supported Fe-N catalysts (Fe-N/C). These catalysts were characterized in terms of catalyst composition, structure, and morphology by several instrumental methods such as energy dispersive X-ray, X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy. With respect to the ORR activity, the Fe-N/C catalysts were also evaluated by cyclic voltammetry, as well as rotating disk and ring-disk electrodes. The results showed that among the heat-treated catalysts, that obtained at a heat-treatment temperature of 800 °C is the most active ORR catalyst. The overall electron transfer number for the catalyzed ORR was determined to be between 3.5 and 3.8, with 10-30% H2O2 production. The ORR catalytic activity of this catalyst was also tested in a hydrogen-air proton exchange membrane (PEM) fuel cell. At a cell voltage of 0.30 V, this fuel cell can give a current density of 0.23 A cm−2 with a maximum MEA power density of 0.070 W cm−2 indicating that this catalyst has potential to be used as a non-noble catalyst in PEM fuel cells. |
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Keywords: | Catalyst carbon support Electrocatalyst Oxygen reduction reaction (ORR) Iron (Fe)-nitrogen (N) 2 4 6-Tris(2-pyridyl)-1 3 5-triazine (TPTZ) Heat (pyrolysis) treatment Proton exchange membrane (PEM) fuel cell |
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