Publication: Electrochemical performance of solid oxide electrolysis cell electrodes under high-temperature coelectrolysis of steam and carbon dioxide
Issued Date
2011-09-01
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ISSN
03787753
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2-s2.0-79958850116
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Mahidol University
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SCOPUS
Bibliographic Citation
Journal of Power Sources. Vol.196, No.17 (2011), 7161-7168
Suggested Citation
Pattaraporn Kim-Lohsoontorn, Joongmyeon Bae Electrochemical performance of solid oxide electrolysis cell electrodes under high-temperature coelectrolysis of steam and carbon dioxide. Journal of Power Sources. Vol.196, No.17 (2011), 7161-7168. doi:10.1016/j.jpowsour.2010.09.018 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/11701
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Title
Electrochemical performance of solid oxide electrolysis cell electrodes under high-temperature coelectrolysis of steam and carbon dioxide
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Abstract
The SOEC electrodes during steam (H 2 O) electrolysis, carbon dioxide (CO 2 ) electrolysis, and the coelectrolysis of H 2 O/CO 2 are investigated. The electrochemical performance of nickel-yttria stabilised zirconia (Ni-YSZ), Ni-Gd 0.1 Ce 0.9 O 1.95 (Ni-GDC), and Ni/Ruthenium-GDC (Ni/Ru-GDC) hydrogen electrodes and La 0.8 Sr 0.2 MnO 3-δ - YSZ (LSM-YSZ), La 0.6 Sr 0.4 Co 0.8 Fe 0.2 O 3-δ (LSCF), and La 0.8 Sr 0.2 FeO 3-δ (LSF) oxygen electrodes are studied to assess the losses of each electrode relative to a reference electrode. The study is performed over a range of operating conditions, including varying the ratio of H 2 O/H 2 and CO 2 /CO (50/50 to 90/10), the operating temperature (550-800 °C), and the applied voltage. The activity of Ni-YSZ electrodes during H 2 O electrolysis is significantly lower than that for H 2 oxidation. Comparable activity for operating between the SOEC and solid oxide fuel cell (SOFC) modes is observed for the Ni-GDC and Ni/Ru-GDC. The overpotential of H 2 electrodes during CO 2 reduction increases as the CO 2 /CO ratio is increased from 50/50 to 90/10 and further increases when the electrode is exposed to a 100% CO 2 (800 °C), corresponding to the increase in the area specific resistance. The electrodes exhibit comparable performance during H 2 O electrolysis and coelectrolysis, while the electrode performance is lower in the CO 2 -electrolysis mode. The activity of all the O 2 electrodes as an SOFC cathode is higher than that as SOEC anodes. Among these O 2 electrodes, LSM-YSZ exhibits the nearest to symmetrical behaviour. © 2010 Elsevier B.V. All rights reserved.