Let there be light! A dithiolate-bridged [FeFe] complex with structural features of the [FeFe] hydrogenase active site has been photoelectrochemically reduced by a p-type Si photocathode at a potential 500 mV less negative compared with a glassy carbon electrode (see figure). In the presence of HClO4, hydrogen generation has been achieved at a photovoltage of 600 mV with a (105±5) % Faradaic efficiency.
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