The cell ohmic resistance was measured in the high frequencyregion (1 kHz) to investigate the possible reactions in the anode. Asshown inFig. 2, the reverse Boudouard reaction was dominant inCB, evident from the dramatic drop in cell resistance as the reactortemperature was increased beyond 700C. The reverse Boudouardreaction spontaneously occurred over 800C, as seen from theconverging cell resistances of all samples. At this point, carbonmonoxide (CO) is the thermodynamically dominant species[38].On the other hand, WCG exhibited simultaneous gasification reactions other than the reverse Boudouard reaction (e.g. pyrolysis) inthe temperature range considered.
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