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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/19874

Title: Dye-sensitization of boron-doped diamond foam: champion photoelectrochemical performance of diamond electrodes under solar light illumination
Authors: Krysova, Hana
Kavan, Ladislav
Zivcova, Zuzana Vlckova
Yeap, Weng Siang
Verstappen, Pieter
Maes, Wouter
Haenen, Ken
Gao, Fang
Nebel, Christoph E.
Issue Date: 2015
Citation: RSC ADVANCES, 5 (99), p. 81069-81077
Abstract: Diamond foams composed of hollow spheres of polycrystalline boron-doped diamond are chemically modified with two donor-acceptor type molecular dyes, BT-Rho and CPDT-Fur, and tested as electrode materials for p-type dye-sensitized solar cells with an aqueous electrolyte solution containing methyl viologen as a redox mediator. Reference experiments with flat polycrystalline diamond electrodes evidence full blocking of the methyl viologen redox reaction by these dyes, whereas only partial blocking is observed for the diamond foams. This is ascribed to sp(2)-carbon impurities in the foam, viz. trans-polyacetylene and graphite-like carbon. Cathodic photocurrents under solar light illumination are about 3 times larger on foam electrodes compared to flat diamond. Long-term (1-2 days) illumination of the sensitized foam electrodes with chopped light at 1 sun intensity causes an increase of the cathodic photocurrent density to ca. 15-22 mu A cm(-2). These photocurrent densities represent the largest values reported so far for dye-sensitized diamond electrodes. The photoelectrochemical activation of the sensitized diamond electrodes is accompanied with characteristic changes of the dark voltammogram of the MV2+/MV+ redox couple and with gradual changes of the IPCE spectra.
Notes: [Krysova, Hana; Kavan, Ladislav; Zivcova, Zuzana Vlckova] AS CR, Vvi, J Heyrovsky Inst Phys Chem, CZ-18223 Prague 8, Czech Republic. [Yeap, Weng Siang; Verstappen, Pieter; Maes, Wouter; Haenen, Ken] Hasselt Univ, Inst Mat Res IMO, B-3590 Diepenbeek, Belgium. [Maes, Wouter; Haenen, Ken] IMOMEC, IMEC Vzw, B-3590 Diepenbeek, Belgium. [Gao, Fang; Nebel, Christoph E.] Fraunhofer Inst Appl Solid State Phys IAF, D-79108 Freiburg, Germany.
URI: http://hdl.handle.net/1942/19874
DOI: 10.1039/c5ra12413a
ISI #: 000362436800024
ISSN: 2046-2069
Category: A1
Type: Journal Contribution
Validation: ecoom, 2016
Appears in Collections: Research publications

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