Fluorescence and Electrochemistry to Study the Electronic Transfer from an Organic Dye to Battery Active Materials: Towards Developing an Operating Photobattery
Notice bibliographique
Résumé
Intensive efforts are currently dedicated towards developing devices that can convert and store renewable energy derived from renewable sources. These are to address the current global energy consumption needs and reduce the carbon footprint that is associated with the use of primary non-renewable energy resources. Indeed, many of these approaches are promising for reducing energy inequalities. They can also mitigate greenhouse emissions. Within this context, solar energy is among one of the best suited candidates to address the global energy needs in a sustainable manner. It is also an attractive energy source because of its widespread availability. A major challenge of using solar energy is that it must be stored for use during periods when there is no sun. Devices are therefore required that can convert, store, and deliver the stored energy during dark periods. To address the energy storage needs, lithium-ion batteries have been successfully coupled to solar cells such as silica based photovoltaic panels. Indeed, lithium-ion batteries are suitable candidates because they are a proven technology that offers high energy density and a long cycle life. Furthermore, they are ideal for portable applications such as photobatteries. These are energy capturing and storage devices that combine a light harvesting solar cell with an energy storing battery. The collective efforts of our research groups have been focused on developing a single device that can collectively harvest the energy derived from sun light and store its energy courtesy of redox reactions that are specific to a battery. Our approach involves merging dye-sensitized solar cell technology (DSSC) with a proven lithium ion battery to ultimately make an all-in-one device. Towards this end, we investigated an organic dye as the light harvesting component. The given dye was selected because it satisfies many of the physical and electrochemical requirements for its use in the combined photobattery. Of importance, is the dye’s photophysical properties. It broadly absorbs in the visible spectrum, it is capable of being reduced by the battery’s electroactive component upon light absorption, it exhibits a high degree of colorfast, and it is photostable. While the organic dye in principle possesses the required properties that are suited for its use as the light harvesting component of the photobattery, these have not been experimentally validated under. Both the photophysical and electrochemical properties of the dye under device-like conditions must therefore be evaluated. To confirm the concept, the capacity of the organic dye to undergo required electron transfer from the lithium active compound of the battery upon photoexcitation was therefore evaluated. Studies done by both steady-state and time-resolved emission quenching measurements in a systematic way will be presented. These will be complemented with transient absorption spectroscopy measurements. These were done to confirm that the desired dye radical anion was indeed formed by electron transfer from the lithium active component. Step-wise electrochemical studies such as galvanostatic cycling and chroroamperometry under illumination, with the various photoactive and battery components, will also be presented as evidence for the required light mediated electron transfer mechanism. It will be presented that collectively the individual photo- and electrochemical studies provide sound evidence for electron transfer between the constitutional “solar” and “battery” components, laying the experimental groundwork for an all-in-one photobattery. It will further be presented that conventional solvents in batteries can be replaced with environmentally benign water. The combined aqueous photobattery will therefore have a positive ecological impact both in terms of using sustainable means for energy harvesting/storage and the constitution components of the device.
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Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,001 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,001 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».