Electrochemical characterization of a novel iodine-free electrolyte for dye-sensitized solar cell

Wu, Congcong; Gong, Yingpeng; Han, Song; Jin, Tetsuro; Chi, Bo; Pu, Jian; Li, Jian

doi:10.1016/j.electacta.2012.03.104

Cited by 19 publications

(21 citation statements)

References 32 publications

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“…A current limitation was also observed during EDRS measurements with this type of electrolyte. Previously, Wu et al found no significant peaks for triiodide in the iodine-free electrolyte, presenting the electrolyte showed no obvious bond intensity of I 3 À [26]. In this research, however, we have found the peaks in the iodine-free electrolyte during the voltage modulation.…”

Section: Resultscontrasting

confidence: 76%

“…2(a)). Higher V OC values with the lower iodine concentration are explained by a lower backward electron transfer at the interface of the TiO 2 electrode and electrolyte [26]. There are two major recombination processes: i) a direct electron injection from the conduction band in TiO 2 into the oxidized form of dye molecules, and ii) the charge injection into the oxidized form of the redox couple in the electrolyte [19].…”

Section: Resultsmentioning

confidence: 98%

“…Additionally, in the iodine-free electrolyte, it is not easy to calculate the diffusion coefficient using Eq. (1) without inserting the concentration of I 3 À that directly corresponds to the concentration of iodine added in the electrolyte [26]. Although the EDRS enables elucidating the formation and existence of I 3 À in an iodine-free electrolyte, it is still not easy to empirically determine the initial formation and existence of I 3 À , and its concentration under an open-circuit condition in an iodine-free electrolyte.…”

Section: Resultsmentioning

confidence: 99%

“…In UVevis absorbance spectra, the transparent iodine-free electrolyte only absorbs wavelengths of less than 480 nm. Furthermore, when no iodine is added to the electrolyte, it is more complicated to apply an equation for determining the diffusion coefficient of I 3 À as follows [26]:…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

In-situ analyses of triiodide formation in an iodine-free electrolyte for dye-sensitized solar cells using electro-diffuse-reflection spectroscopy (EDRS)

Seo

Bialecka

Kang

et al. 2015

Journal of Power Sources

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Section: Resultscontrasting

confidence: 76%

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

In-situ analyses of triiodide formation in an iodine-free electrolyte for dye-sensitized solar cells using electro-diffuse-reflection spectroscopy (EDRS)

Seo

Bialecka

Kang

et al. 2015

Journal of Power Sources

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“…6 did not move during the aging but an extra peak appeared at 400 nm for all the cells aged under illumination. The most likely reason for this peak is the bleached electrolyte: e.g., iodine in the electrolyte absorbs less light at shorter wavelengths, 37 allowing the dye to absorb more light in this wavelength area. It is also noteworthy that the new peak does not appear in the IPCE curves of the reference cells E1 and F2, which were stored in the dark and apparently were not bleached.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Electrolyte Purification on the Performance and Long-Term Stability of Dye-Sensitized Solar Cells

Tiihonen

Miettunen

Rendon

et al. 2015

J. Electrochem. Soc.

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In this study the effect of the purification of electrolyte material on the performance and long-term stability of dye-sensitized solar cells is investigated. The combined effect of purifying all the electrolyte materials has been examined, as has the effect of purifying each compound to identify those compounds worth purifying and to eliminate unnecessary production steps on an industrial scale. Statistical methods were employed to draw statistically significant conclusions from the experimental results. No effect on the initial cell performance is found in this study. The purity of the electrolyte solvent (here methoxypropionitrile) is shown to have a remarkable effect on the cell lifetime: it could even double when the cell is properly purified. It is shown that exposing the cell to even relatively small amounts of UV light resulted in cell degradation through electrolyte bleaching during a 1000 hour aging test. Here the impurities in the electrolyte solvent lead to an almost doubled rate of electrolyte bleaching under UV light. Dye-sensitized solar cells (DSSC) have the potential to become a low-cost alternative to silicon solar cells in the future. They can be made out of sustainable materials, they have a wide application area, and they are on the threshold of large-scale production.1 They are also efficient: an 11.9% efficiency record for DSSCs has been achieved.2 At the moment one of the main challenges is the cell stability. DSSC stability for approximately 20 years in outdoor conditions is an essential prerequisite for the introduction of DSSCs into the wide commercial market, e.g., in the form of building-integrated panels. The structure of DSSCs is quite complicated and unfortunately the components tend to age when the DSSC is exposed long-term to light, humidity, and extreme temperatures. 3,1,4,5,6,7,8 Material purification has been proposed to increase the stability of the cells.9-12 The use of highly pure materials is also regarded as an essential step in the preparation of most efficient cells. 13,10,14 The reported data do not, however, include direct comparisons of purified and unpurified materials, which would be essential for assessing the importance of material purification in cell fabrication. From the industrial point of view, material purification increases the production costs of the cells. Thus the necessity of material purification should be studied carefully, 1,15 just like any step that increases the complexity of the production. The objective of this study is to investigate if cell efficiency and stability increase as a result of the purification of the electrolyte material. The effect of the purification of all the electrolyte materials has been studied and the effect of each compound has been statistically compared and analyzed. The research continues in, 16 where the effect of dye purification on cell efficiency and lifetime is studied.It is still quite common in the field to utilize only a few tests, mainly IV curve measurements in aging studies, or to test the cells only at the...

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Analyses of structurally modified quasi‐solid‐state electrolytes using electrochemical impedance spectroscopy for dye‐sensitized solar cells

Seo

Hinsch

Veurman

et al. 2013

J of Applied Polymer Sci

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Electrochemical properties of structurally modified quasi-solid-state electrolytes were examined using porous substrates (PSs). The PS was prepared into two categories by a phase inversion method with a brominated poly(phenylene oxide) (BPPO): the sponge and finger types. Effects of the humidification and cosolvent compositions on the morphology of the PS were analyzed by scanning electron microscopy. In all cases of the PSs, a higher VOC was observed of about 0.1 V than that of a liquid electrolyte owing to a suppressed back electron charge transfer. In addition, the PS prepared by the polymer solution of 1: 4: 1 (BPPO: N-methyl-2-pyrrolidone: butyl alcohol) with the humidification process showed better photovoltaic properties in terms of the current density and conversion efficiency owing to the appropriate combinations of pore size, tortuosity, and interconnectivity. Effects of the pore structures were intensively examined using electrochemical impedance spectroscopy. The impedance results revealed that large pores at the surface layers are advantageous for a lower RS and RTiO2. Meanwhile, the straight inner structure is beneficial for the facile I-/I3 - diffusion, thus lowering RPt

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Electrochemical characterization of a novel iodine-free electrolyte for dye-sensitized solar cell

Cited by 19 publications

References 32 publications

In-situ analyses of triiodide formation in an iodine-free electrolyte for dye-sensitized solar cells using electro-diffuse-reflection spectroscopy (EDRS)

In-situ analyses of triiodide formation in an iodine-free electrolyte for dye-sensitized solar cells using electro-diffuse-reflection spectroscopy (EDRS)

The Effect of Electrolyte Purification on the Performance and Long-Term Stability of Dye-Sensitized Solar Cells

Analyses of structurally modified quasi‐solid‐state electrolytes using electrochemical impedance spectroscopy for dye‐sensitized solar cells

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