The present embodiment provide a method for evaluating anion permeability of a graphene-containing membrane and also to provide a photoelectric conversion device employing a graphene-containing membrane having controlled anion permeability. The method comprises:
preparing a measuring apparatus comprising an aqueous solution containing anions, a working electrode containing silver-metal, a counter electrode and a reference electrode;
measuring the reaction current I0 between the silver-metal and the anions while the electrode potential of the working electrode to the counter electrode is being periodically changed and driven under the condition that the electrodes are in contact with the aqueous solution; measuring the reaction current I1 under the condition that, instead of the working electrode, the graphene-containing membrane electrically connecting to the working electrode is in contact with the aqueous solution; and comparing the currents I0 and I1 to evaluate anion-permeability of the graphene-containing membrane.