Journal
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
Volume 17, Issue 1, Pages 121-127Publisher
SPRINGER
DOI: 10.1007/s10008-012-1866-5
Keywords
Solid-state fuel cells; Carbon; CO; Reaction mechanism; Verification
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Funding
- National Science Foundation of China (NSFC) [20976063]
- 863 Program of China [2007AA05Z136]
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Anode-supported tubular solid oxide fuel cells (SOFCs) with Cu-CeO2-yttria-stabilized zirconia (YSZ) anode, YSZ electrolyte film, and silver cathode were fabricated. The cells were tested with 5 wt% Fe-loaded activated carbon and dry CO, respectively, and their performances were compared to verify the reaction mechanism of direct carbon SOFCs (DC-SOFCs). The corresponding current-voltage curves and impedance characteristics of the cells operating on these two different fuels were found to be almost the same at high temperatures, demonstrating the presumed mechanism that the anode reaction of a DC-SOFC is the electrochemical oxidation of CO, just as in a SOFC operated directly on CO. Some experimental evidences including the difference in open circuit voltage at different temperatures and the operating stability of the cells were analyzed in detail.
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