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Hydrogen was evolved from water by the photoelectrochemical reduction of methylviologen (MV2+) and the catalytic electron transfer from reduced MV+. to H+ in neutral aqueous solution. Taking advantage of this process, reduction of water into H2 by using a Zinc-tetraphenylporphine (ZnTPP) photoelectrode is suggested.
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Kawai et al. (1979) studied this question.
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