Highly efficient H2 evolution catalyzed by mononuclear Co complex supported by a new type of pentadentate ligand (DPA-Bpy) was developed in purely aqueous solution. Electrocatalytic H2 evolution with Faradaic efficiency of 99% was obtained for water reduction at -1.4 V (vs SHE) at neutral pH, corresponding to 1400 L H2 (mol cat)-1 h-1(cm2 Hg)-1. In a photocatalytic system consisting of ascorbic acid, [Ru(bpy)3]2+, and Co catalyst, evolution of H2 with TON up to 4400 and TOF up to 4000 h-1 was determined after irradiation at 450 nm in aqueous solution under optimal conditions.

Electrocatalytic and photocatalytic hydrogen production in aqueous solution by a molecular cobalt complex

244th National Meeting (2012)

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