TY - JOUR
T1 - Overall conductivity and electromotive force of SrZr0.9Yb 0.1O3-a cell system supplied with moist CH4
AU - Fukada, Satoshi
AU - Suemori, Shigenori
AU - Onoda, Ken
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2007
Y1 - 2007
N2 - A proton-conducting ceramic cell for recovering tritium from process streams was investigated for its application to a fusion reactor system. The ceramic cell tested here was composed of a SrZr0.9Yb 0.1O3-a tube, one end of which was closed, and Ni/SiO 2 and NiO/SiO2 porous electrodes. Its anode was supplied with moist CH4 or H2 and its cathode with moist O 2. All of the j-V curves obtained by a direct-current method were correlated to the relation V = E0 -jd/σ at 600-700°C regardless of the two different conditions of the CH4 + H 2O and H2 + H2O supply. The rate-controlling step of charged hydrogen ion transfer was determined from the dependences of the overall conductivity σ and the electromotive force E0 on the anode H2O partial pressure and temperature. The E0 value under the condition of the CH4 + H2O supply was affected by the diffusion of reaction products of CH4 + H2O = CO + 3H2 through the porous anode. On the other hand, the σ value was limited by the oxygen reduction rate at the cathode interface between the ceramic and the Ni electrode regardless of the different conditions between CH4 + H2O and H2 + H2O. These results were consistent with our results obtained by an alternating-current method. The activation energy of the overall conductivity was 60 kJ/mol.
AB - A proton-conducting ceramic cell for recovering tritium from process streams was investigated for its application to a fusion reactor system. The ceramic cell tested here was composed of a SrZr0.9Yb 0.1O3-a tube, one end of which was closed, and Ni/SiO 2 and NiO/SiO2 porous electrodes. Its anode was supplied with moist CH4 or H2 and its cathode with moist O 2. All of the j-V curves obtained by a direct-current method were correlated to the relation V = E0 -jd/σ at 600-700°C regardless of the two different conditions of the CH4 + H 2O and H2 + H2O supply. The rate-controlling step of charged hydrogen ion transfer was determined from the dependences of the overall conductivity σ and the electromotive force E0 on the anode H2O partial pressure and temperature. The E0 value under the condition of the CH4 + H2O supply was affected by the diffusion of reaction products of CH4 + H2O = CO + 3H2 through the porous anode. On the other hand, the σ value was limited by the oxygen reduction rate at the cathode interface between the ceramic and the Ni electrode regardless of the different conditions between CH4 + H2O and H2 + H2O. These results were consistent with our results obtained by an alternating-current method. The activation energy of the overall conductivity was 60 kJ/mol.
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U2 - 10.3327/jnst.44.1324
DO - 10.3327/jnst.44.1324
M3 - Article
AN - SCOPUS:36148932565
VL - 44
SP - 1324
EP - 1329
JO - Journal of Nuclear Science and Technology
JF - Journal of Nuclear Science and Technology
SN - 0022-3131
IS - 10
ER -