Abstract
Amphiphilic ruthenium complexes immobilised on bare silica gel are an easily prepared heterogeneous system for photocatalytic and chemical water oxidation.
Highlights
Global energy consumption is constantly increasing and renewable carbon-neutral alternatives to fossil fuels have to be found
We have recently developed self-assembled systems both for water oxidation and reduction based on amphiphilic metal complexes embedded in a phospholipid vesicular membrane, which increases the local concentration of photosensitiser and catalyst maintaining the activity even at low concentrations
During our study focused on an application of supported ionic liquid phase (SILP) in photocatalytic water oxidation, a strong affinity of amphiphilic metal complexes to an untreated silica gel was observed
Summary
Immobilisation of water-oxidising amphiphilic ruthenium complexes on unmodified silica gel†. Amphiphilic ruthenium complexes that catalyse the oxidation of water by light or cerium(IV) are noncovalently immobilised on untreated, commercial silica gel. The heterogeneous catalysts are prepared in one step and require no additives. High affinity of the amphiphilic complexes to silica gel leads to their rapid absorption from chloroform solution on silica gel. The complexes maintain immobilised in aqueous solution and their oxygen generation activity is comparable to water-soluble analogues. The catalytic activity of the immobilised complexes does not depend on the surface loading. The simple technique facilitates the recovery and recycling of precious metals used in catalytic water oxidation
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