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Detailed Program
Paper Number : FU-O01
Time Frame : 15:50~16:02
Presentation Date : Thurseday, 27, November
Session Name : Fuel cells and batteries
Session Chair 1# : Jong-Jin Choi
Session Chair 2# : Nobuhito Imanaka
Decomposition of Carbon Monoxide and Carbon Dioxide Using Cathode-Supported Dense Yttria-Stabilized Zirconia Electrolyte Cell
Taro SHIMONOSONO
Kagoshima University
The electrochemical decomposition of CO and CO2 gases was examined using the cell of Ni-YSZ cathode/dense YSZ electrolyte/Ru-YSZ anode (YSZ: 8 mol% Y2O3-stabilized ZrO2) [1]. In the case of the cell with a porous YSZ electrolyte [2], CO gas was decomposed to form solid carbon at the cathode, while the unreacted CO gas was transported to the anode through the porous electrolyte and reacted with the oxide ions to form CO2 gas (Fig. 1(A)). Such CO2 formation was avoided by the dense electrolyte and the CO decomposition rate of 67-100% was achieved at the applied voltage of 2-8 V. In the CO2 decomposition, CO and O2 gases were formed at the cathode and anode sides, respectively, and the carbon deposition hardly occurred. When the mixture of CO and CO2 gases was supplied, only a small amount of carbon was observed in the cathode. One of the possible reasons would be the reaction between the deposited carbon and the mixed CO2 gas (C + CO2  2CO).


Figure 1 Scheme of electrochemical decomposition of CO and CO2 gases using (A) porous oxide ion electrolyte and (B) dense oxide ion electrolyte.

References:
[1] T. Shimonosono, M. Ueno, Y. Hirata and S. Sameshima, Ceram. Inter., accepted 2014, DOI: 10.1016/j.ceramint.2014.07.124
[2] Y. Hirata, M. Ando, N. Matsunaga and S. Sameshima, Ceram. Inter., 38 (2012) 6377.
Acknowledgements :