Enhancement of oxygen reduction activity with addition of carbon support for non-precious metal nitrogen doped carbon catalyst |
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Authors: | Taigo Onodera Shuichi SuzukiTakaaki Mizukami Hisao Kanzaki |
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Affiliation: | a Fundamental Technology Center, Development and Technology Division, Hitachi Maxell, Ltd., 1-1-88 Ushitora, Ibaraki-shi, Osaka 567-8567, Japan b Hitachi Research Laboratory, Hitachi Ltd., 7-1-1 Omika, Hitachi-shi, Ibaraki 319-1292, Japan |
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Abstract: | An improved synthesis scheme of non-precious metal N-doped carbon catalysts for oxygen reduction reaction is reported. The non-precious metal N-doped carbon catalysts were prepared by pyrolysis of the mixture (phenol resin, Ketjen black carbon support and cobalt phenanthroline complex). The drastic improvement of distribution state of Ketjen black supported non-precious metal N-doped carbon catalysts was observed by means of transmission electron microscopy (TEM). In addition, the non-precious metal N-doped carbon catalyst synthesized with Ketjen black carbon support showed much higher oxygen reduction reaction (ORR) activity relative to unsupported non-precious metal N-doped carbon catalyst in O2-saturated 0.5 mol l−1 H2SO4 at 35 °C. Moreover, the highest ORR activity was obtained with addition of optimum amount of Ketjen black carbon support was thirtyfold compared to unsupported non-precious metal N-doped carbon catalyst at 0.7 V. Similarly, the performance of a polymer electrolyte fuel cell (PEFC) using the non-precious metal N-doped carbon catalyst as the cathode electrode catalyst was obviously better than that of the non-precious metal N-doped carbon catalyst before optimization. Microstructure, specific surface area and surface composition of the non-precious metal N-doped carbon catalysts were analyzed by XRD, XPS and BET measurement with nitrogen physisorption, respectively. |
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Keywords: | Fuel cells Non-precious metal catalyst Nitrogen-doped carbon Oxygen reduction reaction |
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