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Efficiency Enhancement of Cocktail Dye of Ixora coccinea and Tradescantia spathacea in DSSC.

Zolkepli Z, Lim A, Ekanayake P, Tennakoon K - J Biophys (2015)

Bottom Line: The surface charge (zeta-potential), average size of aggregated anthocyanin molecules (zetasizer), and anthocyanin stability in different storage temperatures were analyzed and recorded.Tradescantia/Ixora pigments mixed in 1 : 4 ratio showed the highest cell efficiency of η = 0.80%, under the irradiance of 100 mW cm(-2), with a short-circuit current density 4.185 mA/cm(2), open-circuit voltage of 0.346 V, and fill factor of 0.499.It was found that the desired storage temperature for these cocktail dyes to be stable over time was -20°C, in which the anthocyanin half-life was about approximately 1727 days.

View Article: PubMed Central - PubMed

Affiliation: Environmental and Life Sciences Programme, Universiti Brunei Darussalam, Jalan Tungku Link, Gadong BE1410, Brunei Darussalam.

ABSTRACT
The use of anthocyanin dyes extracted from epidermal leaves of Tradescantia spathacea (Trant) and petals of Ixora coccinea (IX) was evaluated in the application of dye-sensitized solar cells (DSSCs). Subsequently, cocktail anthocyanin dyes from these dyes were prepared and how they enhanced the cell's overall performance was assessed using five different volume-to-volume ratios. Cocktail dyes absorbed a wider range of light in the visible region, thus increasing the cell efficiencies of the cocktail dyes when compared to the DSSC sensitized by individual dyes. The surface charge (zeta-potential), average size of aggregated anthocyanin molecules (zetasizer), and anthocyanin stability in different storage temperatures were analyzed and recorded. Lower size of aggregated dye molecules as revealed from the cocktail dyes ensured better adsorption onto the TiO2 film. Tradescantia/Ixora pigments mixed in 1 : 4 ratio showed the highest cell efficiency of η = 0.80%, under the irradiance of 100 mW cm(-2), with a short-circuit current density 4.185 mA/cm(2), open-circuit voltage of 0.346 V, and fill factor of 0.499. It was found that the desired storage temperature for these cocktail dyes to be stable over time was -20°C, in which the anthocyanin half-life was about approximately 1727 days.

No MeSH data available.


Related in: MedlinePlus

The absorption spectra of the extracts of Tradescantia spathacea (Trant) and Ixora coccinea (IX) in original and acidified extract.
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Related In: Results  -  Collection


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fig1: The absorption spectra of the extracts of Tradescantia spathacea (Trant) and Ixora coccinea (IX) in original and acidified extract.

Mentions: A conductive glass (FTO) containing sintered TiO2 was prepared as the photoanode. The photoelectrodes (anodes) were fabricated using a TiO2 paste Solaronix (nanoxide-T, colloidal anatase particles size: ~13 nm, ~120 m2 g−1 (BET), Switzerland). The TiO2 was coated on precleaned fluorine-doped conducting tin oxide (FTO) glasses (Nippon Sheet Glass ~7 Ω sq−1) by doctor blade method. Electrodes were preheated (~50°C) using a hair dryer and sintered at 450°C for 30 minutes. The thickness of the TiO2 electrodes used for this investigation was ~9 μm (Scanning Electron Microscope, SEM) [20]. The anodes were dipped in respective dye solutions (Trant, IX, and the cocktail dyes) as the photosensitizers. These were left submerged approximately for 16 hours at room temperature in the dark to avoid light exposure. This allows enough time for the dyes to adsorb onto the TiO2 porous layer. The anodes were then rinsed with ethanol and air dried. Electrolyte, containing tetrabutylammonium iodide (TBAI, 0.5 M)/I2 (0.05 M), in a mixture of acetonitrile and ethylene carbonate (6 : 4, v/v), was then introduced between the dyed TiO2 electrode and platinum counter electrode [21]. These DSSCs were placed under irradiation of light (100 mW/cm2) using sun simulator (DYESOL) for about 4 hours for better incorporation of electrolyte into the TiO2 layer [22]. Figure 1 shows a schematic diagram of a functioning DSSC. The performance of the cell in terms of energy conversion efficiency (η) was evaluated by using relation of short-circuit current (Isc), open-circuit voltage (Voc), and fill factor (FF) as shown below: (2)η=FF×Isc×VocP,where Isc is the short-circuit photocurrent density (A cm−2), Voc is the open-circuit voltage (V), P is the intensity of the incident light (W cm−2), and FF is the fill factor defined as FF = ImVm/IscVoc, in which Im and Vm are the optimum photocurrent and voltage that can be extracted from the maximum power calculated from the I-V data [20].


Efficiency Enhancement of Cocktail Dye of Ixora coccinea and Tradescantia spathacea in DSSC.

Zolkepli Z, Lim A, Ekanayake P, Tennakoon K - J Biophys (2015)

The absorption spectra of the extracts of Tradescantia spathacea (Trant) and Ixora coccinea (IX) in original and acidified extract.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4697096&req=5

fig1: The absorption spectra of the extracts of Tradescantia spathacea (Trant) and Ixora coccinea (IX) in original and acidified extract.
Mentions: A conductive glass (FTO) containing sintered TiO2 was prepared as the photoanode. The photoelectrodes (anodes) were fabricated using a TiO2 paste Solaronix (nanoxide-T, colloidal anatase particles size: ~13 nm, ~120 m2 g−1 (BET), Switzerland). The TiO2 was coated on precleaned fluorine-doped conducting tin oxide (FTO) glasses (Nippon Sheet Glass ~7 Ω sq−1) by doctor blade method. Electrodes were preheated (~50°C) using a hair dryer and sintered at 450°C for 30 minutes. The thickness of the TiO2 electrodes used for this investigation was ~9 μm (Scanning Electron Microscope, SEM) [20]. The anodes were dipped in respective dye solutions (Trant, IX, and the cocktail dyes) as the photosensitizers. These were left submerged approximately for 16 hours at room temperature in the dark to avoid light exposure. This allows enough time for the dyes to adsorb onto the TiO2 porous layer. The anodes were then rinsed with ethanol and air dried. Electrolyte, containing tetrabutylammonium iodide (TBAI, 0.5 M)/I2 (0.05 M), in a mixture of acetonitrile and ethylene carbonate (6 : 4, v/v), was then introduced between the dyed TiO2 electrode and platinum counter electrode [21]. These DSSCs were placed under irradiation of light (100 mW/cm2) using sun simulator (DYESOL) for about 4 hours for better incorporation of electrolyte into the TiO2 layer [22]. Figure 1 shows a schematic diagram of a functioning DSSC. The performance of the cell in terms of energy conversion efficiency (η) was evaluated by using relation of short-circuit current (Isc), open-circuit voltage (Voc), and fill factor (FF) as shown below: (2)η=FF×Isc×VocP,where Isc is the short-circuit photocurrent density (A cm−2), Voc is the open-circuit voltage (V), P is the intensity of the incident light (W cm−2), and FF is the fill factor defined as FF = ImVm/IscVoc, in which Im and Vm are the optimum photocurrent and voltage that can be extracted from the maximum power calculated from the I-V data [20].

Bottom Line: The surface charge (zeta-potential), average size of aggregated anthocyanin molecules (zetasizer), and anthocyanin stability in different storage temperatures were analyzed and recorded.Tradescantia/Ixora pigments mixed in 1 : 4 ratio showed the highest cell efficiency of η = 0.80%, under the irradiance of 100 mW cm(-2), with a short-circuit current density 4.185 mA/cm(2), open-circuit voltage of 0.346 V, and fill factor of 0.499.It was found that the desired storage temperature for these cocktail dyes to be stable over time was -20°C, in which the anthocyanin half-life was about approximately 1727 days.

View Article: PubMed Central - PubMed

Affiliation: Environmental and Life Sciences Programme, Universiti Brunei Darussalam, Jalan Tungku Link, Gadong BE1410, Brunei Darussalam.

ABSTRACT
The use of anthocyanin dyes extracted from epidermal leaves of Tradescantia spathacea (Trant) and petals of Ixora coccinea (IX) was evaluated in the application of dye-sensitized solar cells (DSSCs). Subsequently, cocktail anthocyanin dyes from these dyes were prepared and how they enhanced the cell's overall performance was assessed using five different volume-to-volume ratios. Cocktail dyes absorbed a wider range of light in the visible region, thus increasing the cell efficiencies of the cocktail dyes when compared to the DSSC sensitized by individual dyes. The surface charge (zeta-potential), average size of aggregated anthocyanin molecules (zetasizer), and anthocyanin stability in different storage temperatures were analyzed and recorded. Lower size of aggregated dye molecules as revealed from the cocktail dyes ensured better adsorption onto the TiO2 film. Tradescantia/Ixora pigments mixed in 1 : 4 ratio showed the highest cell efficiency of η = 0.80%, under the irradiance of 100 mW cm(-2), with a short-circuit current density 4.185 mA/cm(2), open-circuit voltage of 0.346 V, and fill factor of 0.499. It was found that the desired storage temperature for these cocktail dyes to be stable over time was -20°C, in which the anthocyanin half-life was about approximately 1727 days.

No MeSH data available.


Related in: MedlinePlus