Solvent dependent natural dye extraction and its sensitization effect for dye sensitized solar cells

Adedokun, Oluwaseun; Sanusi, Yekinni Kolawole; Awodugba, Ayodeji Oladiran

doi:10.1016/j.ijleo.2018.06.064

Cited by 36 publications

(24 citation statements)

References 23 publications

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“…It can be seen that the TiO 2 particles were aggregated to form homogenous and crack-free nanoclusters. Similar morphology was reported in [36]. The morphology of the photoanode strongly affects the photoelectrochemical activity of the DSSCs.…”

supporting

confidence: 79%

Dye-Sensitized Solar Cells (DSSCs) Based on Extracted Natural Dyes

Ammar

Mohamed

Yousef

et al. 2019

Journal of Nanomaterials

138

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Here, three natural dyes were extracted from different fruits and leaves and used as sensitizers for dye-sensitized solar cells (DSSCs). Chlorophyll was extracted from spinach leaves using acetone as a solvent. Anthocyanin was extracted from red cabbage and onion peels using water. Different characterizations for the prepared natural dyes were conducted including UV-vis absorption, FTIR, and steady-state/time-resolved photoluminescence spectroscopy. Various DSSCs based on the extracted dyes were fabricated. The degradation in the power conversion efficiencies was monitored over a week. The effect of the TiO2 mesoporous layers on the efficiency was also studied. The interfaces between the natural dyes and the TiO2 layers were investigated using electrochemical impedance spectroscopy.

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supporting

confidence: 79%

Dye-Sensitized Solar Cells (DSSCs) Based on Extracted Natural Dyes

Ammar

Mohamed

Yousef

et al. 2019

Journal of Nanomaterials

138

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“…To tackle this first phase, we have used different vegetable raw material: pollen, coffee grains, beetroot, bougainvillea bracts with different colors, and eggplant peels, all of them easily available. Solvent influence on natural dye extraction has been dealt with previously [21][22][23]42]. In our case, after a previous sequence of tests with different solvents and procedures, four simple and economical extraction methods have been selected using HCl, acetone, water and ethanol.…”

Section: Dyes Preparation and Characterizationmentioning

confidence: 99%

“…There are several binding modes and sites which are influenced by several factors like dye's structure, total anchoring groups, energy levels, pH, substrate pre-treatment, etc. [61] Some works include absorption spectra of dyes onto TiO 2 film [20,21,27,32,49,50,55,59,[66][67][68][69][70][71]. Calogero and col. published UV-Vis absorption spectra of anthocyanins and betalains onto TiO 2 [67].…”

Section: How the Dye Solution Adsorbs Onto Semiconductor Dssc Filmmentioning

confidence: 99%

“…Further purification, combinations, analysis, and use constitute the body of the studies, together with new ideas about cell implementation. Researches have focused on the influence of different factors on the final performance, such as: solvent for extraction and adsorption [21][22][23], extraction time [18], pH and temperature during dye adsorption onto the nanoporous film [24], dipping time [25], dye mixing or co-sensitization [26][27][28], together with "tandem" cells [28], film thickness [22,29] etc. Some papers include also theoretical calculations or simulations [24,30,31], for example, adsorption isotherms of a dye onto TiO 2 film are fitted by models established through statistical physics treatment [24] or chlorophyll is used as a reference dye to simulate absorption spectra and theoretically calculate ground and excited state properties [30].…”

Section: Introductionmentioning

confidence: 99%

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Optimizing a Simple Natural Dye Production Method for Dye-Sensitized Solar Cells: Examples for Betalain (Bougainvillea and Beetroot Extracts) and Anthocyanin Dyes

García-Salinas

Ariza

2019

Applied Sciences

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We present a study about the sensitizers extracted from natural resources. This paper focuses on how to select, extract and characterize natural dyes, giving some guides to establish a protocol for the whole process of fabricating and using these dyes. The influence of the extraction solvent and method, and of parameters such as pH are analyzed. Also, dye precursor and dye extract stability have been studied, as well as how the dye adsorbs onto substrates and the effect of mixing or concentrating the extracts. Results concerning betalain pigments present in bougainvillea and beetroot extracts, and anthocyanins in eggplant extracts, analyzed by using UV-Vis spectrometry, are included. As an example of application, we report procedures intended to test and enhance the dye potential as a main component of dye-sensitized solar cells (DSSCs). DSSCs mimic nature’s photosynthesis and have some advantages like an easy and low-cost fabrication procedure. Their efficiency depends on its design and fabrication process and also on the different components involved. Hence, optimizing each component is essential to achieve the best performance, and thus the dye used as a sensitizer is crucial. We fabricate cells by using a simple procedure: As the interest is focused on the sensitizer, the same consecutive steps are followed, varying only the dye extract. Among all the natural-dyes tested, beetroot extract reaches up to 0.47% cell efficiency, which is near the highest values found in literature for this pigment.

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“…135,163,172,173 The generated IPCE does not exceed 20%, even if charge injection is usually very fast, due to problems related to dye aggregation, electron recombination with the oxidized sensitizer and electron recapture by the iodine/iodide electrolyte. In all of these examples, both the efficiency and stability of lab-scale DSSCs are highly affected by the temperature of the extracting solvent and its nature, 174,175 where mainly its polarity influences the solubility of the pigments. Actually, acidic aqueous dye extracts greatly improved the coloration of the photoanodes for selected eggplant and red grape extracts compared to that obtained from ethanolic solutions.…”

Section: Photosensitizers For Dsscsmentioning

confidence: 99%