Abstract
Photochemical water oxidation, as a half-reaction of water splitting, represents a great challenge towards the construction of artificial photosynthetic systems. Complexes of first-row transition metals have attracted great attention in the last decade due to their pronounced catalytic efficiency in water oxidation, comparable to that exhibited by classical platinum-group metal complexes. Cobalt, being an abundant and relatively cheap metal, has rich coordination chemistry allowing construction of a wide range of polynuclear architectures for the catalytic purposes. This review covers recent advances in application of cobalt complexes as (pre)catalysts for water oxidation in the model catalytic system comprising [Ru(bpy)3]2+ as a photosensitizer and S2O82− as a sacrificial electron acceptor. The catalytic parameters are summarized and discussed in view of the structures of the catalysts. Special attention is paid to the degradation of molecular catalysts under catalytic conditions and the experimental methods and techniques used to control their degradation as well as the leaching of cobalt ions.
Highlights
Worldwide energy demand is satisfied mostly with fossil fuels, such as gas, oil, and coal [1,2]
In this review we focus on the cobalt polynuclear complexes as the catalysts under the studied catalytic conditions
Ln3+ aggregates serves as a catalytic promoter, possibly working analogytransfer to dissolved separately andlanthanide do not form in a solution
Summary
Worldwide energy demand is satisfied mostly with fossil fuels, such as gas, oil, and coal [1,2]. (for recent reviews see [5,6,7,8,9,10]), upon irradiation, the photosensitizer (chlorophyll) in the PSII abstracts electrons from a water-oxidizing complex (WOC). The first‐row transition a great interest formabundant a practicaland point ofexpensive view [35,36,37,38] Inalso this represent review weafocus the cobalt metals, as the more less ones, greaton interest formpolynuclear a practical complexes as the catalysts for light-driven water oxidation, with special attention to their stability point of view [35,36,37,38]. Simple cobalt compounds (salts and oxides) in the catalytic chemical water oxidation with strong oxidants has been known for some but did attract until. In 2009, Jiao and system with the nanoparticles as a WOC, at mild conditions
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