Factor Optimization in the Manufacturing Process of Dye-Sensitized Solar Cells Based on Naturally Extracted Dye from a Maqui and Blackberry Mixture (Aristotelia Chilensis and Rubus Glaucus)

Leyrer, J.; Rubilar, Mónica; Morales, Estela; Pavez, Boris; Leal, Eduardo Souza; Hunter, R.

doi:10.1007/s11664-018-6514-0

Cited by 14 publications

(9 citation statements)

References 42 publications

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“…The photocatalytic oxidation of aniline started at pH 7, and as presented above, the highest percentage of discoloration was reached with the 25 Ma sample, with a higher content of anthocyanins, resulting in improvement in the visible-light activity of TiO 2 for this process. As was described by Leyrer et al [18], maqui and blackberry have remarkably similar UV and visible absorption spectra, with two peaks in the range of 200-300 nm and one peak in the range of 450-600 nm, and the absorptions of the peaks are relatively equivalent between the two. The visible range absorption for these pigments provides the electrons necessary for the enhancement of TiO 2 visible-light activity.…”

Section: Discussionsupporting

confidence: 63%

“…Maqui (Aristotelia chilensis) is a forest fruit from the south of Chile that mostly grows in the wild. In the last decade, different studies have found that it has functionalities that can be used for food and pharmaceutical purposes due to its high content of anthocyanin [16][17][18][19][20]. They have been predominantly studied in dye-sensitized solar cells (DSSCs), as discussed above.…”

Section: Discussionmentioning

confidence: 99%

“…Maqui (Aristotelia chilensis) and blackberry (Rubus glaucus), as primary sources of anthocyanin pigments, have been combined in other DSSC studies, which demonstrated that a combination of the anthocyanins from both fruits resulted in better improvement in the efficiency of the solar cell, depending on the concentration of the pigment in the mixture. They also showed that this mixture presented a good ability to bind to TiO 2 [18].…”

Section: Introductionmentioning

confidence: 92%

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Visible-Light Photocatalytic Degradation of Aniline Blue by Stainless-Steel Foam Coated with TiO2 Grafted with Anthocyanins from a Maqui-Blackberry System

2020

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Anthocyanins from maqui (Aristotelia chilensis) and blackberry (Rubus glaucus) were used as light harvesters to improve the photocatalytic activity of titanium dioxide in visible light. Anthocyanins from both species were obtained using high-frequency ultrasound-assisted liquid-liquid extraction with methanol. Mixtures of anthocyanins were developed to study their effectiveness in the visible light/TiO2 reaction for the oxidation of aniline blue. For this purpose, stainless-steel foams were covered with TiO2 and anthocyanin and characterized by SEM. Different samples were fabricated by varying the ratio of the two anthocyanins in the mixture (100, 75, 50, 25 and 0 vol% of maqui-anthocyanin (delphinidin)). The mixtures of 25 vol% anthocyanin from maqui and 75 vol% anthocyanin from blackberry had higher total anthocyanin content and better photocatalytic activity in visible light: degradation of aniline blue was 40% at pH 7, 56% at pH 3 and 95% at pH 3 with the injection of oxygen for 2 h in comparison with TiO2-foam/UV light, which yielded values of 13% at pH 7 and 73% at pH 3 with and without the addition of oxygen. Natural dyes that are low-cost and environmentally friendly substances are shown to be capable of improving the visible-light photocatalytic activity of TiO2.

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Section: Discussionsupporting

confidence: 63%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

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Visible-Light Photocatalytic Degradation of Aniline Blue by Stainless-Steel Foam Coated with TiO2 Grafted with Anthocyanins from a Maqui-Blackberry System

2020

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“…Ruthenium and osmium metal-organic complexes have been the most stable and effective dyes used for DSSCs [16,17]. Due to the fact that these dyes are toxic, expensive, and difficult to synthesize, growing activities for using natural dyes have been reported [18][19][20]. Natural-based DSSCs have not shown high efficiency compared to the artificial ones, mainly due to the weak binding with TiO 2 film as well as the low charge-transfer absorption in the whole visible range [21].…”

Section: Introductionmentioning

confidence: 99%

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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“…A decrease in the value of the b* index indicates a greater proportion of blue than yellow content. Anthocyanin pigments, in addition to the red group, are composed of blue and violet water-soluble polyphenolic components that are available in berries [44].…”

Section: Color Values Of Freeze-dried Maqui Berries and Gels Obtainedmentioning

confidence: 99%

Evaluation of Color, Texture, Sensory and Antioxidant Properties of Gels Composed of Freeze-Dried Maqui Berries and Agave Sugar

et al. 2020

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The study aimed to determine the textural, sensory, and antioxidant properties of gels composed of maqui (Aristotelia chilensis) berries. These freeze-dried berries were tested in a powdered form as an additive (0–5%) to agave sugar (20%) gels. Freeze-dried maqui powdered berries were dark purple to almost black in color and were characterized by an L* value of 16.3, an a* value of 8.3, and a b* value of −9.6. The b* values decreased from 11.8 to 2.3 with the increase in the amount of berry powder. There were no significant changes in the color of gels composed of berries at 4% and 5% concentration. Gels lost (almost twice) their hardness as the amount of maqui increased. The lowest values of hardness and the highest values of elasticity, springiness, gumminess, and chewiness were observed at 4% concentration of dried berries. The type of sugar did not affect the lightness of the gels (L* parameter) and the a* value. The assessors evaluated the gels composed of agave sugar (20%) and 4% maqui and 0.5% citric acid to be the best. Phenolic content and antioxidant activity were significantly higher in these gels compared to the control gels. After obtaining this low sugar gels, consumers could enrich their diets with healthier products.

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Factor Optimization in the Manufacturing Process of Dye-Sensitized Solar Cells Based on Naturally Extracted Dye from a Maqui and Blackberry Mixture (Aristotelia Chilensis and Rubus Glaucus)

Cited by 14 publications

References 42 publications

Visible-Light Photocatalytic Degradation of Aniline Blue by Stainless-Steel Foam Coated with TiO2 Grafted with Anthocyanins from a Maqui-Blackberry System

Visible-Light Photocatalytic Degradation of Aniline Blue by Stainless-Steel Foam Coated with TiO2 Grafted with Anthocyanins from a Maqui-Blackberry System

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

Evaluation of Color, Texture, Sensory and Antioxidant Properties of Gels Composed of Freeze-Dried Maqui Berries and Agave Sugar

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