Efficiency and stability of spectral sensitization of boron-doped-diamond electrodes through covalent anchoring of a donor–acceptor organic chromophore (P1)
| Autor: | Ladislav Kavan, Radek Jurok, Petr Cigler, Martin Kuchar, Jan Barton, Hana Krysova, Vaclav Petrak |
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| Rok vydání: | 2016 |
| Předmět: |
Photocurrent
Materials science General Physics and Astronomy Diamond Chemical modification 02 engineering and technology Chromophore engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences 0104 chemical sciences Covalent bond Electrode engineering Molecule Quantum efficiency Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | Physical Chemistry Chemical Physics. 18:16444-16450 |
| ISSN: | 1463-9084 1463-9076 |
| Popis: | A novel procedure is developed for chemical modification of H-terminated B-doped diamond surfaces with a donor-π-bridge-acceptor molecule (P1). A cathodic photocurrent near 1 μA cm(-2) flows under 1 Sun (AM 1.5) illumination at the interface between the diamond electrode and aqueous electrolyte solution containing dimethylviologen (electron mediator). The efficiency of this new electrode outperforms that of the non-covalently modified diamond with the same dye. The found external quantum efficiency of the P1-sensitized diamond is not far from that of the flat titania electrode sensitized by a standard organometallic dye used in solar cells. However, the P1 dye, both pure and diamond-anchored, shows significant instability during illumination by solar light. The degradation is a two-stage process in which the initially photo-generated products further decompose in complicated dark reactions. These findings need to be taken into account for optimization of organic chromophores for solar cells in general. |
| Databáze: | OpenAIRE |
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