We attempted to fabricate and evaluate a new nitrogen oxides (NO
x) decomposition electrochemical cell with the additional NO
x adsorbent and investigated a cell operating method to achieve a low temperature operation in the presence of excess O
2. To clarify the arrangement that improves the effect of NO
x absorbent on NO
x decomposition property at low temperature range, we carried out the NO
x decomposition measurements on three kinds of electrochemical cells. As a result, NO
x 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 CeO
2) based cell with the NO
x 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 KNO
3 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.
View full abstract