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Superior solar-to-hydrogen energy conversion efficiency by visible light-driven hydrogen production via highly reduced Ti2+/Ti3+ states in blue-titanium dioxide photocatalyst

Abstract

Photocatalytic water splitting is one of the most important renewable paths and a reliable hydrogen production system. In most successful molecular and supramolecular biomimetic hydrogen production methods, a photosensitizer and a catalyst were constructed where the photoexcited electron in the photosensitizer is transferred either inter- or intramolecularly to the catalytic centre. Similar to supramolecular complexes in a photoctalytic hydrogen production scheme, here we develop a redox system that contains Ti3+/Ti2+ reduced states in TiO2 which act as both visible light harvesting component as well as the catalytic site for the catalytic hydrogen production with visible-near infrared photons. The Ti3+/Ti2+ states in TiO2 produce hydrogen from pure water with a solar-to-hydrogen energy conversion efficiency of 0.89% and a quantum yield of 43% at 655 nm. The mechanism of hydrogen production by Ti3+/Ti2+ reduced states in TiO2 involves the initial generation of highly air stable and highly reduced Ti3+ and Ti2+ states in TiO2 by the formation of an AlOOH layer surrounding the anatase and rutile particles. Once Ti3+ and Ti2+ states are generated, these states are continuously self-generated via absorption of visible-near infrared radiations where hydrogen is produced by the transfer of electrons from Ti3+/Ti2+ to H+.

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Publication details

The article was received on 11 Jun 2018, accepted on 27 Jul 2018 and first published on 28 Jul 2018


Article type: Paper
DOI: 10.1039/C8CY01212A
Citation: Catal. Sci. Technol., 2018, Accepted Manuscript
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    Superior solar-to-hydrogen energy conversion efficiency by visible light-driven hydrogen production via highly reduced Ti2+/Ti3+ states in blue-titanium dioxide photocatalyst

    N. L. D. Silva, A. C. A. JAYASUNDERA, A. Folger, O. Kasian, S. Zhang, C. Yan, C. Scheu and J. Bandara, Catal. Sci. Technol., 2018, Accepted Manuscript , DOI: 10.1039/C8CY01212A

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