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The addition of methyl viologen (MV2+) accelerates the reduction of Na2SeO3 not only in 0.1moldm−3 sodium phosphate buffer (PBS, pH 7) but also in 0.22moldm−3 sodium acetate buffer (pH 4). Water-insoluble red Se is dispersed in the vicinity of the electrode surface as the reduced product. Michaelis-Menten-type relationship is obtained between the reduction current and the concentration of Na2SeO3, suggesting that MV2+ molecules mediate the electron transfer from the electrode to HSeO3 or SeO3 dissolved in PBS. MV2+ is also effective in accelerating the reduction of SeO4, which has already been reported to be electrochemically inactive. © The Electrochemical Society of Japan, All rights reserved.

Acceleration of Electroreduction Reaction of Water-Soluble Selenium Compounds in the Presence of Methyl Viologen