| 摘要 |
PURPOSE:To increase an effective length which takes part in electrochemical reactions in a working electrode and improve a sensor sensitiveness by forming projections and recesses on and in, respectively, the surface of at least the working electrode, arranging electrodes such that counter electrodes are positioned as opposed to a plurality of the sides of the working electrode while surrounding it as a center and reference electrodes are positioned as sandwiched by the working electrodes and the counter electrodes therebetween. CONSTITUTION:A detecting gas which is transmitted and reaches the reaction portion 20 of a working electrode causes electrochemical oxidation and reduction reactions on the surface of the projected and recessed reaction portion 20. Then, ions generated by the reactions are transmitted via the electrolyte layer 5 of the opposed portion of the working electrode 2 and a counter electrode 3. That is, the substantial effective area of the reaction portion 20 which takes part in the electrochemical reactions has a wide range along the three-sides of the reaction portion 20. Therefore, an effective length which takes part in the electrochemical reactions on the working electrode 2 is increased. As a result, a sensor sensitiveness can be improved. |
