Single-site nickel-grafted anatase TiO2 for hydrogen production: Toward understanding the nature of visible-light photocatalysis

•Atomically-isolated Ni species result in the visible-light photocatalytic properties of Ni/TiO2.•Ti-O-Ni linkage units function as the so-called “p–n heterojunction”.•The visible-light absorption originates from metal-to-metal charge transfer of the TiONi linkage unites.•Electrons produced by MMCT...

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