Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 37, Issue 10, Pages 8878-8888Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2012.01.138
Keywords
Artificial photosynthesis; Photocatalysis; Solar fuels; Water oxidation; X-ray absorption spectroscopy
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Funding
- Berlin Cluster of Excellence on Unifying Concepts in Catalysis (UniCat)
- European Union [212508]
- German 'Bundesministerium fur Bildung und Forschung' (BMBF) [03SF0355D]
- Swedish Energy Agency
- Knut and Alice Wallenberg Foundation
- European Community [236511 FP7-PEOPLE-IIF-2008]
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The atomic structure of water-oxidizing nanoparticles (10-60 nm) formed from cobalt(II) salts and methylenediphosphonate (M2P) is investigated. These amorphous nanoparticles are of high interest for production of solar fuels. They facilitate water oxidation in a directly light-driven process using [Ru(bpy)(3)](2+) (bpy = 2,2'-bipyridine) as a photosensitizer and persulfate (S2O82-) as an electron acceptor. By X-ray absorption spectroscopy (XAS) at the cobalt K-edge, cobalt L-edge and oxygen K-edge, we investigate the light-driven transition from the Co-II/M2P precursor to the active catalyst, which is a layered cobalt(III) oxide with structural similarities to water-oxidizing electrocatalysts. The M2P ligand likely binds at the periphery of the nanoparticles, preventing their further agglomeration during the catalytic reaction. This system opens a possibility to link the catalytically active nanoparticles via a covalent bridge to a photosensitizer and build an artificial photosynthetic system for direct utilization of solar energy for fuel production without production of electricity as an intermediate step. This article is part of a Special Issue entitled: Photosynthetic and Biomimetic Hydrogen Production. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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