Electrochemical cell with two layers cathode for NO decomposition |
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Authors: | S Bredikhin K Maeda M Awano |
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Institution: | (1) Synergy Ceramics Laboratory, FCRA, Shimo-Shidami, Moriyama-ku, 463-8687 Nagoya, Japan;(2) NIRIN, Shimo-Shidami, Moriyama-ku, 463-8687 Nagoya, Japan |
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Abstract: | An electrochemical cell composed of an yttria-stabilized zirconia disk and two layers cathode was used for nitrogen monoxide
decomposition. It was found that covering the Pt cathode by a mixture of oxygen ionic conductor (YSZ) and electronic conductor
(NiO) leads to enhancement of the performance of the electrochemical cell for NOx decomposition in the presence of excess oxygen. The decomposition activity was measured for the one-compartment cell oxide|(cathode)|YSZ|(anode)
by applying a DC voltage lower than 3.7 V in the temperature range 550–700 °C. The microstructure of the YSZ-NiO mixed oxide
electrodes was investigated in dependence of the cell operating condition and the working electrode sintering temperature.
The correlation between the microstructure of the mixed oxide electrode and conversion rate of NO was studied. The phenomenon
of self-optimization of the microstructure of the NiO-YSZ working electrode during the cell operation was observed and investigated.
Paper presented at the 7th Euroconference on Ionics, Calcatoggio, Corsica, France, Oct. 1–7, 2000. |
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