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Inorganics 2017, 5(1), 14; doi:10.3390/inorganics5010014

Light to Hydrogen: Photocatalytic Hydrogen Generation from Water with Molecularly-Defined Iron Complexes

Leibniz Institute for Catalysis, University of Rostock (LIKAT), Albert-Einstein-Straße 29a, 18059 Rostock, Germany
Institute of Chemistry, Department Physical Chemistry, University of Rostock, Dr.-Lorenz-Weg 1, 18059 Rostock, Germany
Institute of Physics, University of Rostock, Albert-Einstein-Straße 23-24, 18059 Rostock, Germany
Author to whom correspondence should be addressed.
Academic Editor: Matthias Bauer
Received: 27 January 2017 / Revised: 27 February 2017 / Accepted: 27 February 2017 / Published: 9 March 2017
(This article belongs to the Special Issue Photochemical Water Splitting)
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Photocatalytic hydrogen generation is considered to be attractive due to its combination of solar energy conversion and storage. Currently-used systems are either based on homogeneous or on heterogeneous materials, which possess a light harvesting and a catalytic subunit. The subject of this review is a brief summary of homogeneous proton reduction systems using sacrificial agents with special emphasis on non-noble metal systems applying convenient iron(0) sources. Iridium photosensitizers, which were proven to have high quantum yields of up to 48% (415 nm), have been employed, as well as copper photosensitizers. In both cases, the addition or presence of a phosphine led to the transformation of the iron precursor with subsequently increased activities. Reaction pathways were investigated by photoluminescence, electron paramagnetic resonance (EPR), Raman, FTIR and mass spectroscopy, as well as time-dependent DFT-calculations. In the future, this knowledge will set the basis to design photo(electro)chemical devices with tailored electron transfer cascades and without the need for sacrificial agents. View Full-Text
Keywords: hydrogen; iron; copper; hydrogenases; photosensitizer; photocatalysis; water splitting; spectroscopy hydrogen; iron; copper; hydrogenases; photosensitizer; photocatalysis; water splitting; spectroscopy

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Junge, H.; Rockstroh, N.; Fischer, S.; Brückner, A.; Ludwig, R.; Lochbrunner, S.; Kühn, O.; Beller, M. Light to Hydrogen: Photocatalytic Hydrogen Generation from Water with Molecularly-Defined Iron Complexes. Inorganics 2017, 5, 14.

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