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The Effect of Chloride Anions on Charge Transfer in Dye-Sensitized Photoanodes for Water Splitting

Quantum Electronics Laboratory, Faculty of Physics, Adam Mickiewicz University, ul. Umultowska 85, PL-61614 Poznań, Poland
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Biomimetics 2019, 4(1), 5; https://doi.org/10.3390/biomimetics4010005
Received: 8 October 2018 / Revised: 5 January 2019 / Accepted: 10 January 2019 / Published: 16 January 2019
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Abstract

The photoelectrochemical behavior of dye-sensitized photoelectrochemical cells based on a TiO2 layer sensitized with ruthenium components, including an absorber, ruthenium(II)bis(2,2′-bipyridine)([2,2′-bipyridine]-4,4′-diylbis(phosphonic acid)) dibromide (RuP), and a catalyst, ruthenium(II) tris(4-methylpyridine)(4-(4-(2,6-bis((l1-oxidanyl)carbonyl)pyridin-4-yl)phenyl) pyridine-2,6-dicarboxylic acid) (RuOEC), was investigated in the following water-based electrolyte configurations: KCl (pH ≈ 5), HCl (pH ≈ 3), ethylphoshonic acid (pH ≈ 3) with a different KCl concentration, and a standard phosphate buffer (pH ≈ 7). The rate of charge transfer on the photoanode’s surface was found to increase in line with the increase in the concentration of chloride anions (Cl) in the low pH electrolyte. This effect is discussed in the context of pH influence, ionic strength, and specific interaction, studied by cyclic voltammetry (CV) in dark conditions and upon illumination of the photoanodes. The correlations between photocurrent decay traces and CV studies were also observed. View Full-Text
Keywords: dye-sensitized photoelectrochemical cell; charge transfer; chloride anions; titanium dioxide; ruthenium catalyst; electron transfer; hole-hopping dye-sensitized photoelectrochemical cell; charge transfer; chloride anions; titanium dioxide; ruthenium catalyst; electron transfer; hole-hopping
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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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Grądzka, I.; Gierszewski, M.; Ziółek, M. The Effect of Chloride Anions on Charge Transfer in Dye-Sensitized Photoanodes for Water Splitting. Biomimetics 2019, 4, 5.

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