Abstract
Anodic overpotential has been investigated with gas composition changes in a <TEX>$100cm^2$</TEX> class molten carbonate fuel cell. The overpotential was measured with steady state polarization, reactant gas addition (RA), inert gas step addition (ISA), and electrochemical impedance spectroscopy (EIS) methods at different anodic inlet gas compositions, i.e., <TEX>$H_2:CO_2:H_2O=0.69:0.17:0.14\;atm\;and\;H_2:CO_2:H_2O=0.33:0.33:0.33\;atm$</TEX>, at a fixed <TEX>$H_2$</TEX> flow rate. The results demonstrate that the anodic overpotential decreases with increasing <TEX>$CO_2\;and\;H_2O$</TEX> flow rates, indicating the anode reaction is a gas-phase mass-transfer control process of the reactant species, <TEX>$H_2,\;CO_2,\;and\;H_2O$</TEX>. It was also found that the mass-transfer resistance due to the <TEX>$H_2$</TEX> species slightly increases at higher <TEX>$CO_2\;and\;H_2O$</TEX> flow rates. EIS showed reduction of the lower frequency semi-circle with increasing <TEX>$H_2O\;and\;CO_2$</TEX> flow rate without affecting the high frequency semi-circle.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
