Atomic structure of cobalt-oxide nanoparticles activein light-driven catalysis of water oxidation
2012 (English)In: International journal of hydrogen energy, ISSN 0360-3199, Vol. 37, no 10, 8878-8888 p.Article in journal (Refereed) Published
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 CoII/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.
Place, publisher, year, edition, pages
2012. Vol. 37, no 10, 8878-8888 p.
Artificial photosynthesis, Photocatalysis, Solar fuels, Water oxidation, X-ray absorption spectroscopy
Artificiell fotosyntes, Fotokatalys, Solbränslen, Vattenoxidation, Röntgenabsorptionsspektroskopi
IdentifiersURN: urn:nbn:se:uu:diva-178581DOI: 10.1016/j.ijhydene.2012.01.138ISI: 000305040400083OAI: oai:DiVA.org:uu-178581DiVA: diva2:542362
International conference Photosynthesis Research for Sustainability, Baku, Azerbaijan, from July 24 to 30, 2011