Visible light driven generation of chlorine and bromine. Photooxidation of chloride and bromide in aqueous solution at illuminated n-type semiconducting molybdenum diselenide and molybdenum disulfide electrodes

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N-type semiconducting, single-crystal MoS2 and MoSe2 are demonstrated to serve as durable photoanodes for the photogeneration of Br2 or Cl2 from aqueous 12 M LiBr or 15 M LiCl, respectively. The current efficiency for the generation of X2 is measured to be greater than 90% and many more moles of X2 can be generated than the number of moles of MoSe2 or MoS2 used.