TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Component: The conductive separator is used as an anode or a cathode for electrolysis. The gasket and the conductive separator are integrated in one piece. The trapping agent comprises an organic ion exchanger, an inorganic ion exchanger, an organic adsorbent, or an inorganic adsorbent, and has a particle size distribution in which particles having a particle diameter of 0.1-10 micrometers account for at least 50% on the numeric basis. The trapping agent forms a coating film on the surface of the conductive separator. The coating film has a thickness of 1-50 micrometers.Preferred Condition: The conductive separator or the gasket has been subjected to immersion in water kept at at least 80degreesC or an aqueous solution having pH of at least -0.3 for at least 10 hours; immersion in water kept at at least 80degreesC while bubbling it with a gas containing carbon dioxide for at least 10 hours; ultrasonic cleaning in water kept at at least 80degreesC or an aqueous solution having pH of at least -0.3 for at least 1 hour; or exposure to a gas at at least 80degreesC and a relative humidity of 100% for at least 10 hours. The electrolysis carried out in water or an aqueous solution having pH of at least-0.3 in a hydrogen atmosphere for at least 0.5 hours while applying to the anode a potential of 0.05 to 0.2 V relative to a spontaneous potential, or applying to the cathode a potential of at most -0.1 V relative to a spontaneous potential. The conductive carbon material has been subjected to sintering in an inert gas atmosphere or a vacuum atmosphere of at most 10-1 Pa at at least 500degreesC.    TECHNOLOGY FOCUS - POLYMERS - Preferred Component: The conductive separator comprises a binder resin.Preferred Composition: The conductive separator contains 1-10 pbw trapping agent per 100 pbw binder resin.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The conductive separator comprises a conductive carbon material. The conductive separator and/or gasket further contain a trapping agent capable of trapping either an anion or a cation. EXAMPLE - A separator was prepared using conductive carbon derived from artificial graphite (highly purified graphite having TOC (180 microg), ammonium ion (15 microg), chlorine ion (8 microg), bromine ion (2 microg), and sulfite ion (3 microg); and resin derived from fluorinated ethylene-propylene resin having TOC (85 microg), ammonium ion (18 microg), fluorine ion (218), and chlorine ion (7 microg). The separator was inserted in unit cell. It was subjected to leaching test and exhibited an electric conductivity of 831 microS/cm, TOC (155 microg), ammonium ion (13 microg), fluorine ion (48), and chlorine ion (5 microg), and a continuous power generation test at 69.2 V, 62.3 V, and 6.9 V, respectively.