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| Preparation and Electrochemical Activity of Fe/Co/N/MWCNTs Catalysts for Oxygen Reduction Reaction |
| ZHANG Yuhui YI Qingfeng** |
| (School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201) |
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Cite this article:
ZHANG Yuhui YI Qingfeng**. Preparation and Electrochemical Activity of Fe/Co/N/MWCNTs Catalysts for Oxygen Reduction Reaction. Chinese Journal of Materials Research, 2013, 27(4): 367-374.
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Abstract MWCNTs doped polyaniline (PANI) were used as a precursor and the precursor added Fe salt was heated at 900℃ to obtain the Fe-containing catalyst FeNC. Cobalt salt was then added to the FeNC and the mixture was subjected to heat treatment at different temperatures to prepare the various composites FeCoNC. The structure, specific surface area, thermal stability and compositions of the catalysts FeCoNC were characterized by TEM, SEM, TGA and elemental analysis, respectively. The results show that the catalyst structure becomes uniform when the temperature is 500℃, and it appears sintering at the temperature higher than 500℃. The content of N increases first and then decreases with the increasing of temperature. The temperature has a little influence on the specific surface area of the catalysts. TGA suggests that the catalysts have good thermal stability in the air. ORR activity of the catalysts has been tested by CV and RDE techniques. Results show that the catalyst FeCoNC5 obtained by the heating treatment at 500℃ presents the highest electrocatalytic activity for ORR. The ORR current density at 2000r/min is 11.67 mA/mg@-0.3 V(vs SCE) in acidic solution and 9.83 mA/mg@-0.8 V(vs SCE) in alkaline solution, and the onset potential of ORR is 0.63 V(vs SCE) in acidic solution and -0.12 V(vs SCE) in alkaline solution.
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