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Solar energy has enormous potential as a clean,abundant and economical energy source,but cannot be employed as such because it is diffuse and intermittent; solar energy must be captured and converted into useful forms of energy.[1-2] Long ago,Nature figured out how to use photosynthetic complex to capture sunlight and then to store its energy in a chemical form,H2,in which hydrogen metabolism named hydrogenases (H2ases) acts as catalysts to operate the reversible oxidation of H2 to protons and electrons: 2H+ + 2e ? H2.[2-4] With the structural elucidation of [FeFe] H2ases,featuring a butterfly Fe2S2 subunit coordinated by cysteine-linked Fe4S4 cluster,carbon monoxide and cyanide ligands,and by a dithiolate bridging the two iron centers (Scheme 1),a great deal of effort has been undertaken to mimic the structure and functionality of the H2ases,and to understand the mechanism of stepwise proton reduction in the active site of [FeFe] H2ases analogues as well.However,examples of photochemically driven H2 evolution using [FeFe] H2ases mimics as catalysts in solution are challenging.In this contribution,we will describe several artificial photosynthetic systems[4-10] for H2 generation using visible light at room temperature.