Alkali Iodide Deep Eutectic Solvents as Alternative Electrolytes for Dye Sensitized Solar Cells
Different alkali deep eutectic solvents (DES), such as LiI:nEG, NaI:nEG, and KI:nEG, have been tested as electrolytes for dye sensitized solar cells (DSSCs). These DSSCs were prepared using pure DES or, alternatively, DES combined with different amounts of iodine (I<sub>2</sub>). The mos...
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doaj-032c32de2d0e48e69278ebcd8d2d72e42021-04-06T23:04:49ZengMDPI AGSustainable Chemistry2673-40792021-04-0121322223610.3390/suschem2020013Alkali Iodide Deep Eutectic Solvents as Alternative Electrolytes for Dye Sensitized Solar CellsHugo Cruz0Ana Lucia Pinto1Noémi Jordão2Luísa A. Neves3Luís C. Branco4LAQV-REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, PortugalLAQV-REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, PortugalLAQV-REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, PortugalLAQV-REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, PortugalLAQV-REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, PortugalDifferent alkali deep eutectic solvents (DES), such as LiI:nEG, NaI:nEG, and KI:nEG, have been tested as electrolytes for dye sensitized solar cells (DSSCs). These DSSCs were prepared using pure DES or, alternatively, DES combined with different amounts of iodine (I<sub>2</sub>). The most important parameters, such as open circuit voltage (V<sub>OC</sub>), short circuit current density (J<sub>SC</sub>), fill factor (FF), and the overall conversion efficiency (η), were evaluated. Some DES seem to be promising candidates for DSSC applications, since they present higher V<sub>OC</sub> (up to 140 mV), similar FF values but less current density values, when compared with a reference electrolyte in the same experimental conditions. Additionally, electrochemical impedance spectroscopy (EIS) has been performed to elucidate the charge transfer and transport processes that occur in DSSCs. The values of different resistance (Ω·cm<sup>2</sup>) phenomena and recombination/relaxation time (s) for each process have been calculated. The best-performance was obtained for DES-based electrolyte,<b> </b>KI:EG (containing 0.5 mol% I<sub>2</sub>) showing an efficiency of 2.3%. The efficiency of this DES-based electrolyte is comparable to other literature systems, but the device stability is higher (only after seven months the performance of the device drop to 60%).https://www.mdpi.com/2673-4079/2/2/13deep eutectic solvents (DES)electrolytesdye sensitized solar cells (DSSC) |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Hugo Cruz Ana Lucia Pinto Noémi Jordão Luísa A. Neves Luís C. Branco |
spellingShingle |
Hugo Cruz Ana Lucia Pinto Noémi Jordão Luísa A. Neves Luís C. Branco Alkali Iodide Deep Eutectic Solvents as Alternative Electrolytes for Dye Sensitized Solar Cells Sustainable Chemistry deep eutectic solvents (DES) electrolytes dye sensitized solar cells (DSSC) |
author_facet |
Hugo Cruz Ana Lucia Pinto Noémi Jordão Luísa A. Neves Luís C. Branco |
author_sort |
Hugo Cruz |
title |
Alkali Iodide Deep Eutectic Solvents as Alternative Electrolytes for Dye Sensitized Solar Cells |
title_short |
Alkali Iodide Deep Eutectic Solvents as Alternative Electrolytes for Dye Sensitized Solar Cells |
title_full |
Alkali Iodide Deep Eutectic Solvents as Alternative Electrolytes for Dye Sensitized Solar Cells |
title_fullStr |
Alkali Iodide Deep Eutectic Solvents as Alternative Electrolytes for Dye Sensitized Solar Cells |
title_full_unstemmed |
Alkali Iodide Deep Eutectic Solvents as Alternative Electrolytes for Dye Sensitized Solar Cells |
title_sort |
alkali iodide deep eutectic solvents as alternative electrolytes for dye sensitized solar cells |
publisher |
MDPI AG |
series |
Sustainable Chemistry |
issn |
2673-4079 |
publishDate |
2021-04-01 |
description |
Different alkali deep eutectic solvents (DES), such as LiI:nEG, NaI:nEG, and KI:nEG, have been tested as electrolytes for dye sensitized solar cells (DSSCs). These DSSCs were prepared using pure DES or, alternatively, DES combined with different amounts of iodine (I<sub>2</sub>). The most important parameters, such as open circuit voltage (V<sub>OC</sub>), short circuit current density (J<sub>SC</sub>), fill factor (FF), and the overall conversion efficiency (η), were evaluated. Some DES seem to be promising candidates for DSSC applications, since they present higher V<sub>OC</sub> (up to 140 mV), similar FF values but less current density values, when compared with a reference electrolyte in the same experimental conditions. Additionally, electrochemical impedance spectroscopy (EIS) has been performed to elucidate the charge transfer and transport processes that occur in DSSCs. The values of different resistance (Ω·cm<sup>2</sup>) phenomena and recombination/relaxation time (s) for each process have been calculated. The best-performance was obtained for DES-based electrolyte,<b> </b>KI:EG (containing 0.5 mol% I<sub>2</sub>) showing an efficiency of 2.3%. The efficiency of this DES-based electrolyte is comparable to other literature systems, but the device stability is higher (only after seven months the performance of the device drop to 60%). |
topic |
deep eutectic solvents (DES) electrolytes dye sensitized solar cells (DSSC) |
url |
https://www.mdpi.com/2673-4079/2/2/13 |
work_keys_str_mv |
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