期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 40, 期 38, 页码 13090-13098出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2015.07.132
关键词
Direct carbon fuel cell; DC-SOFC; Solid oxide fuel cell; Catalyst; Boudouard reaction
资金
- WOP consortium (Stage II DCFC project)
- Polish Ministry of Science and Higher Education [4150/E-264/S/2013]
In a direct carbon solid oxide fuel cell (DC-SOFC), solid carbonaceous fuel is supplied directly to SOFC anode. This approach offers advantages of high efficiency, system simplicity and possibility of direct conversion for a wide range of solid, carbonaceous fuels. Additional improvements in the cell performance can be achieved with the application of catalysts. Two alternative approaches have been considered to apply catalysts in a DC-SOFC configuration. In the first approach, activated carbon has been impregnated with inexpensive Fe2O3 catalyst before supplying to the anode compartment as a fuel. In the alternative approach, SOFC anode has been impregnated with Fe2O3 catalyst while the non-catalyzed activated carbon was supplied to the anode as a fuel. In both cases, the current density for a fuel cell operating at 0.7 V, more than doubled in comparison to previously reported results in a similar test setup. This result points to the reverse Boudouard reaction (C + CO2 -> 2CO) as a limiting process for the fuel cell performance. Utilization of the in-situ generated CO improved for catalyst-impregnated anode, enabling higher conversion efficiency. Moreover, the impregnation of anode with Fe2O3 consumes 17-times less catalyst than impregnation of carbon, with similar cell performance. The obtained results were compared to other DC-SOFC performance improvement approaches reported in the literature. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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