Influence of NOx absorbent on NOx decomposition propertiy of Gd doped CeO2 based electrochemical cells

概要

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We attempted to fabricate and evaluate a new nitrogen oxides (NOx) decomposition electrochemical cell with the additional NOx adsorbent and investigated a cell operating method to achieve a low temperature operation in the presence of excess O2. To clarify the arrangement that improves the effect of NOx absorbent on NOx decomposition property at low temperature range, we carried out the NOx decomposition measurements on three kinds of electrochemical cells. As a result, NOx absorbent have drastically improved the NO gas decomposition properties though the current values of each cell were almost the same. The NO gas decomposition by a GDC (10 mol % Gd doped CeO2) based cell with the NOx adsorbent took onset around 225°C. Highly effective NO gas decomposition at a low temperature range (<300°C) has been possible by using the electrochemical cell which saturated aqueous solution of KNO3 penetrated into the catalytic layer electrodes after the cell operation. It was clarified that the frequency characteristic was different depending on the cell-operating mode of applied AC voltage.