We attempted to fabricate and evaluate a NOx decomposition electrochemical reactor with an additional NOx adsorption layer on a multilayer catalytic cathode and investigated a cell operating method to achieve low-temperature operation. To clarify the capability of a NOx adsorption layer, we carried out the NOx decomposition measurements of the cell. As a result, NOx adsorption layers have improved the NOx decomposition properties, though the current values of each cell were almost the same. The NO decomposition by a 10 mol % Gd-doped CeO2 based cell with a Pt/K/AI(2)O(3) adsorbent took onset around 225 degrees C. It was clarified that the starting temperature and the efficiency of the NOx decomposition are heavily dependent on the adsorptivity of NOx adsorbent and the cell operating voltage mode. (C) 2008 The Electrochemical Society.