Ionic Liquids as homogeneous photocatalyst for CO2 reduction in protic solvents
The study focuses on the photocatalytic reduction of CO2 in protic solvents such as iPrOH or H2O and in the presence of different imidazolium-based ionic liquids (IL). Under UV–vis irradiation, the dilute IL solution adsorbs light, which allows the generation of radical species via electrons produce...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2022-11-01
|
| Series: | Chemical Engineering Journal Advances |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666821122001399 |
| _version_ | 1797987274553556992 |
|---|---|
| author | Yulan Peng Kai C. Szeto Catherine C. Santini Stéphane Daniele |
| author_facet | Yulan Peng Kai C. Szeto Catherine C. Santini Stéphane Daniele |
| author_sort | Yulan Peng |
| collection | DOAJ |
| description | The study focuses on the photocatalytic reduction of CO2 in protic solvents such as iPrOH or H2O and in the presence of different imidazolium-based ionic liquids (IL). Under UV–vis irradiation, the dilute IL solution adsorbs light, which allows the generation of radical species via electrons produced at the IL, and thus the reduction of CO2. The nature of the solvent impacts the strength of the interaction between the anion and the cation in the IL. The cation functions as an activated species that produces electrons to give the CO2•− radical, and the anion activates the solvent in a way that weakens the HOR bond. All of this contributes to (i) providing protons needed for CO2 reduction, (ii) reducing the energy barrier to CO2 reduction, and ultimately (iii) promoting its efficiency. The important factors we explored are the light adsorption capacity and the value of the Kamlet-Taft (K-T) β parameter, which both have a synergistic effect on the CO2 reduction efficiency. Finally, in aqueous media, the influence of pH was also studied on the selectivity. |
| first_indexed | 2024-04-11T07:46:25Z |
| format | Article |
| id | doaj.art-a121c5aeba784d1fbf84a958fc2c6445 |
| institution | Directory Open Access Journal |
| issn | 2666-8211 |
| language | English |
| last_indexed | 2024-04-11T07:46:25Z |
| publishDate | 2022-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Chemical Engineering Journal Advances |
| spelling | doaj.art-a121c5aeba784d1fbf84a958fc2c64452022-12-22T04:36:18ZengElsevierChemical Engineering Journal Advances2666-82112022-11-0112100379Ionic Liquids as homogeneous photocatalyst for CO2 reduction in protic solventsYulan Peng0Kai C. Szeto1Catherine C. Santini2Stéphane Daniele3Université de Lyon, CNRS UMR 5128, CP2M-ESCPE Lyon, 69616 Villeurbanne cedex, FranceUniversité de Lyon, CNRS UMR 5128, CP2M-ESCPE Lyon, 69616 Villeurbanne cedex, FranceUniversité de Lyon, CNRS UMR 5128, CP2M-ESCPE Lyon, 69616 Villeurbanne cedex, FranceCorresponding author.; Université de Lyon, CNRS UMR 5128, CP2M-ESCPE Lyon, 69616 Villeurbanne cedex, FranceThe study focuses on the photocatalytic reduction of CO2 in protic solvents such as iPrOH or H2O and in the presence of different imidazolium-based ionic liquids (IL). Under UV–vis irradiation, the dilute IL solution adsorbs light, which allows the generation of radical species via electrons produced at the IL, and thus the reduction of CO2. The nature of the solvent impacts the strength of the interaction between the anion and the cation in the IL. The cation functions as an activated species that produces electrons to give the CO2•− radical, and the anion activates the solvent in a way that weakens the HOR bond. All of this contributes to (i) providing protons needed for CO2 reduction, (ii) reducing the energy barrier to CO2 reduction, and ultimately (iii) promoting its efficiency. The important factors we explored are the light adsorption capacity and the value of the Kamlet-Taft (K-T) β parameter, which both have a synergistic effect on the CO2 reduction efficiency. Finally, in aqueous media, the influence of pH was also studied on the selectivity.http://www.sciencedirect.com/science/article/pii/S2666821122001399Ionic LiquidPhotocatalytic CO2 reductionUV–vis adsorptionKamlet-Taft (K-T) β parameterProtic solventpH impact |
| spellingShingle | Yulan Peng Kai C. Szeto Catherine C. Santini Stéphane Daniele Ionic Liquids as homogeneous photocatalyst for CO2 reduction in protic solvents Chemical Engineering Journal Advances Ionic Liquid Photocatalytic CO2 reduction UV–vis adsorption Kamlet-Taft (K-T) β parameter Protic solvent pH impact |
| title | Ionic Liquids as homogeneous photocatalyst for CO2 reduction in protic solvents |
| title_full | Ionic Liquids as homogeneous photocatalyst for CO2 reduction in protic solvents |
| title_fullStr | Ionic Liquids as homogeneous photocatalyst for CO2 reduction in protic solvents |
| title_full_unstemmed | Ionic Liquids as homogeneous photocatalyst for CO2 reduction in protic solvents |
| title_short | Ionic Liquids as homogeneous photocatalyst for CO2 reduction in protic solvents |
| title_sort | ionic liquids as homogeneous photocatalyst for co2 reduction in protic solvents |
| topic | Ionic Liquid Photocatalytic CO2 reduction UV–vis adsorption Kamlet-Taft (K-T) β parameter Protic solvent pH impact |
| url | http://www.sciencedirect.com/science/article/pii/S2666821122001399 |
| work_keys_str_mv | AT yulanpeng ionicliquidsashomogeneousphotocatalystforco2reductioninproticsolvents AT kaicszeto ionicliquidsashomogeneousphotocatalystforco2reductioninproticsolvents AT catherinecsantini ionicliquidsashomogeneousphotocatalystforco2reductioninproticsolvents AT stephanedaniele ionicliquidsashomogeneousphotocatalystforco2reductioninproticsolvents |