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Steam-Carbon Fuel Cell Concept for Cogeneration of Hydrogen and Electrical Power

doi: 10.1149/1.3560475
Steam-Carbon Fuel Cell Concept for Cogeneration of Hydrogen and Electrical Power
This study describes and presents the results of a new electrochemical approach to co-production of hydrogen and electric power using a steam-carbon fuel cell, within which carbon-containing species are kept physically separate from the hydrogen stream by a solid oxide electrolyte membrane. The fuel cell used for this purpose consists of H 2 , H 2 O (g) /Pt/YSZ/Pt/C (s) ,CO,CO 2 and measurements are taken between 600 and 900°C. Peak electrical power generated at 900°C is 8 mW/cm 2 at a current density of 40.5 mA/ cm 2 corresponding to simultaneous production of carbon-free hydrogen at a rate of 354 g H 2 /m 2 day. Electrochemical behavior and cell loss mechanisms are studied using impedance spectroscopy in different cell arrangements operating in steam-carbon and air-carbon modes. Exchange current densities extracted from these measurements indicated activation energies of 80.3 ± 7.9 kJ/ mol for oxygen reduction, 132±12 kJ/mol for CO oxidation, and 189 ± 35 kJ/mol for steam reduction. These results indicate that steam reduction is the dominant loss mechanism with significant contribution from CO oxidation kinetics. Modeling results for the carbon bed indicate that a bed height of 7 mm is capable of supporting cell current densities of 700 mA/cm 2 at 85% effective char utilization, allowing for high performing steam-carbon fuel cells for the simultaneous production of hydrogen and electrical work.
- Stanford University United States
8 Research products, page 1 of 1
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