ArticleProceedings of the National Academy of Sciences of the United States of America2012
Improving the efficiency of water splitting in dye-sensitized solar cells by using a biomimetic electron transfer mediator.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 47 papers.
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47 citing papers in PubMed, 308 citations in OpenAlex.
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- Tuning the redox potential of tyrosine-histidine bioinspired assemblies.Photosynthesis research · 2022Article
- Dye-sensitized solar cells strike back.Chemical Society reviews · 2021Review
- Photodriven water oxidation initiated by a surface bound chromophore-donor-catalyst assembly.Chemical science · 2021Article
- Sustainable hydrogen production from water using tandem dye-sensitized photoelectrochemical cells.Nano convergence · 2021Review
- A diketopyrrolopyrrole dye-based dyad on a porous TiOChemical science · 2020Article
- Stabilization of a molecular water oxidation catalyst on a dye-sensitized photoanode by a pyridyl anchor.Nature communications · 2020Article
- A conductive metal-organic framework photoanode.Chemical science · 2020Article
- HYSCORE and DFT Studies of Proton-Coupled Electron Transfer in a Bioinspired Artificial Photosynthetic Reaction Center.iScience · 2020Article
- Proton-Coupled Electron Transfer from Tyrosine in the Interior of aJournal of the American Chemical Society · 2020Article
- A stable dye-sensitized photoelectrosynthesis cell mediated by a NiO overlayer for water oxidation.Proceedings of the National Academy of Sciences of the United States of America · 2020Article
- Linear correlation models for the redox potential of organic molecules in aqueous solutions.Journal of molecular modeling · 2020Article
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Authors and funding
11 authors at 3 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Photoelectrochemical water splitting directly converts solar energy to chemical energy stored in hydrogen, a high energy density fuel. Although water splitting using semiconductor photoelectrodes has been studied for more than 40 years, it has only recently been demonstrated using dye-sensitized electrodes. The quantum yield for water splitting in these dye-based systems has, so far, been very low because the charge recombination reaction is faster than the catalytic four-electron oxidation of water to oxygen. We show here that the quantum yield is more than doubled by incorporating an electron transfer mediator that is mimetic of the tyrosine-histidine mediator in Photosystem II. The mediator molecule is covalently bound to the water oxidation catalyst, a colloidal iridium oxide particle, and is coadsorbed onto a porous titanium dioxide electrode with a Ruthenium polypyridyl sensitizer. As in the natural photosynthetic system, this molecule mediates electron transfer between a relatively slow metal oxide catalyst that oxidizes water on the millisecond timescale and a dye molecule that is oxidized in a fast light-induced electron transfer reaction. The presence of the mediator molecule in the system results in photoelectrochemical water splitting with an internal quantum efficiency of approximately 2.3% using blue light.
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