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Mechanism of photocatalytic water splitting in TiO. Reaction of water with photoholes, importance of charge carrier dynamics, and evidence for four-hole chemistry

Solar fuel synthesis, mimicking natural photosynthesis, has the potential to meet our increasing global energy demand. Sponsored by the EPSRC Solar Hydrogen project, the paper, for the first time, illustrates that O2 evolution is a multielectron process, taking place extremely slow in the artificial photosynthesis process. The finding led to an article published in London Press Service in 2007 (“Will Renewable Hydrogen Solve The Energy Crisis”). The direct evidence of the low energy conversion efficiency drove the new collaboration with the Photocatalytic Center in the National Institute of Material Science, Japan on efficient photocatalyst development.