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Construction of a Z-scheme g-C3N4/Ag/AgI heterojunction for highly selective photoelectrochemical detection of hydrogen sulfide.

We report the development of a Z-scheme g-C3N4/Ag/AgI heterojunction by photo-deposition of Ag NPs on g-C3N4 and subsequent in situ generation of AgI via partial oxidation of Ag nanoparticles. A highly selective photoelectrochemical sensor for hydrogen sulfide (H2S) detection was constructed based on a g-C3N4/Ag/AgI heterojunction and the transformation of the Z-scheme g-C3N4/Ag/AgI heterojunction to C3N4/Ag/Ag2S.