Stabilized photoanodes for water oxidation by integration of organic dyes, water oxidation catalysts, and electron-transfer mediators.
basic_science · Level V
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- Record sourced from PubMed, PMID 30082396.
- Also identified by DOI 10.1073/pnas.1802903115 and PMC identifier 6112685.
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Abstract
Stabilized photoanodes for light-driven water oxidation have been prepared on nanoparticle core/shell electrodes with surface-stabilized donor-acceptor chromophores, a water oxidation catalyst, and an electron-transfer mediator. For the electrode, fluorine-doped tin oxide FTO|SnO<sub>2</sub>/TiO<sub>2</sub>|-Org1-|1.1 nm Al<sub>2</sub>O<sub>3</sub>|-RuP<sup>2+</sup>-WOC (water oxidation catalyst) with Org1 (1-cyano-2-(4-(diphenylamino)phenyl)vinyl)phosphonic acid), the mediator RuP<sup>2+</sup> ([Ru(4,4-(PO<sub>3</sub>H<sub>2</sub>)<sub>2</sub>-2,2-bipyridine)(2,2-bipyridine)<sub>2</sub>]<sup>2+</sup>), and the WOC, Ru(bda)(py(CH<sub>2</sub>)<sub>(3or10)</sub>P(O<sub>3</sub>H)<sub>2</sub>)<sub>2</sub> (bda is 2,2-bipyridine-6,6-dicarboxylate with x = 3 or 10), solar excitation resulted in photocurrents of ∼500 µA/cm<sup>2</sup> and quantitative O<sub>2</sub> evolution at pH 4.65. Related results were obtained for other Ru(II) polypyridyl mediators. For the organic dye PP (5-(4-(dihydroxyphosphoryl)phenyl)-10,15,20-Tris(mesityl)porphyrin), solar water oxidation occurred with a driving force near 0 V.