The effect of 4-tert-butylpyridine and Li+ on the thermal degradation of TiO2 - bound ruthenium dye N719

Phuong Tuyet Nguyen, Poul Erik Hansen, Torben Lund

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

Thermal stability experiments were performed at 100 °C of the dye-sensitized solar cell ruthenium dye N719. The experiments were performed as simple test-tube experiments carried out with colloidal solutions of N719-loaded TiO2 particles. The dye degradation was followed by the use of HPLC-coupled electrospray mass spectrometry. The longest half life of N719 of 84 h at 100 °C was obtained in 3-methoxypropionitrile based electrolytes containing 0.5 M 4-TBP, no Li+ ions and 0.25 M . If 4-TBP was removed from the solution the degradation rate of N719 increased up to 3–15 times depending on the concentration. If Li+ ions were added to the electrolyte the degradation increased by a factor of 4–16 times and the thermal degradation product mixture became more complex. It is suggested that an adsorbed layer of 4-TBP on the TiO2 protects the N719 dye against solvent substitution and oxidation processes. A complexation constant of Li+ ions with 4-TBP equal to 9 M−1 was obtained by 13C NMR. The Li+ complexation with 4-TBP is thought to destroy the adsorbed protection layer of 4-TBP on the TiO2 surface.

It is concluded that addition of 4-TBP or other N-additives to the DSC electrolyte is important to enhance the dye life time at elevated temperatures. However, addition of Li+ to the electrolyte should be avoided if the wish is to construct DSCs with high thermal stability.
OriginalsprogEngelsk
TidsskriftSolar Energy
Vol/bind88
Sider (fra-til)23-30
ISSN0038-092X
DOI
StatusUdgivet - 2013

Emneord

  • lithium ions
  • Dye-sensitized solar cells

Citer dette

@article{f153e4feff1648d4bae287d716e8fc51,
title = "The effect of 4-tert-butylpyridine and Li+ on the thermal degradation of TiO2 - bound ruthenium dye N719",
abstract = "Thermal stability experiments were performed at 100 °C of the dye-sensitized solar cell ruthenium dye N719. The experiments were performed as simple test-tube experiments carried out with colloidal solutions of N719-loaded TiO2 particles. The dye degradation was followed by the use of HPLC-coupled electrospray mass spectrometry. The longest half life of N719 of 84 h at 100 °C was obtained in 3-methoxypropionitrile based electrolytes containing 0.5 M 4-TBP, no Li+ ions and 0.25 M . If 4-TBP was removed from the solution the degradation rate of N719 increased up to 3–15 times depending on the concentration. If Li+ ions were added to the electrolyte the degradation increased by a factor of 4–16 times and the thermal degradation product mixture became more complex. It is suggested that an adsorbed layer of 4-TBP on the TiO2 protects the N719 dye against solvent substitution and oxidation processes. A complexation constant of Li+ ions with 4-TBP equal to 9 M−1 was obtained by 13C NMR. The Li+ complexation with 4-TBP is thought to destroy the adsorbed protection layer of 4-TBP on the TiO2 surface.It is concluded that addition of 4-TBP or other N-additives to the DSC electrolyte is important to enhance the dye life time at elevated temperatures. However, addition of Li+ to the electrolyte should be avoided if the wish is to construct DSCs with high thermal stability.",
keywords = "lithium ions, Dye-sensitized solar cells",
author = "Nguyen, {Phuong Tuyet} and Hansen, {Poul Erik} and Torben Lund",
year = "2013",
doi = "10.1016/j.solener.2012.11.012",
language = "English",
volume = "88",
pages = "23--30",
journal = "Solar Energy",
issn = "0038-092X",
publisher = "Elsevier Ltd",

}

The effect of 4-tert-butylpyridine and Li+ on the thermal degradation of TiO2 - bound ruthenium dye N719. / Nguyen, Phuong Tuyet; Hansen, Poul Erik; Lund, Torben .

I: Solar Energy, Bind 88, 2013, s. 23-30.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - The effect of 4-tert-butylpyridine and Li+ on the thermal degradation of TiO2 - bound ruthenium dye N719

AU - Nguyen, Phuong Tuyet

AU - Hansen, Poul Erik

AU - Lund, Torben

PY - 2013

Y1 - 2013

N2 - Thermal stability experiments were performed at 100 °C of the dye-sensitized solar cell ruthenium dye N719. The experiments were performed as simple test-tube experiments carried out with colloidal solutions of N719-loaded TiO2 particles. The dye degradation was followed by the use of HPLC-coupled electrospray mass spectrometry. The longest half life of N719 of 84 h at 100 °C was obtained in 3-methoxypropionitrile based electrolytes containing 0.5 M 4-TBP, no Li+ ions and 0.25 M . If 4-TBP was removed from the solution the degradation rate of N719 increased up to 3–15 times depending on the concentration. If Li+ ions were added to the electrolyte the degradation increased by a factor of 4–16 times and the thermal degradation product mixture became more complex. It is suggested that an adsorbed layer of 4-TBP on the TiO2 protects the N719 dye against solvent substitution and oxidation processes. A complexation constant of Li+ ions with 4-TBP equal to 9 M−1 was obtained by 13C NMR. The Li+ complexation with 4-TBP is thought to destroy the adsorbed protection layer of 4-TBP on the TiO2 surface.It is concluded that addition of 4-TBP or other N-additives to the DSC electrolyte is important to enhance the dye life time at elevated temperatures. However, addition of Li+ to the electrolyte should be avoided if the wish is to construct DSCs with high thermal stability.

AB - Thermal stability experiments were performed at 100 °C of the dye-sensitized solar cell ruthenium dye N719. The experiments were performed as simple test-tube experiments carried out with colloidal solutions of N719-loaded TiO2 particles. The dye degradation was followed by the use of HPLC-coupled electrospray mass spectrometry. The longest half life of N719 of 84 h at 100 °C was obtained in 3-methoxypropionitrile based electrolytes containing 0.5 M 4-TBP, no Li+ ions and 0.25 M . If 4-TBP was removed from the solution the degradation rate of N719 increased up to 3–15 times depending on the concentration. If Li+ ions were added to the electrolyte the degradation increased by a factor of 4–16 times and the thermal degradation product mixture became more complex. It is suggested that an adsorbed layer of 4-TBP on the TiO2 protects the N719 dye against solvent substitution and oxidation processes. A complexation constant of Li+ ions with 4-TBP equal to 9 M−1 was obtained by 13C NMR. The Li+ complexation with 4-TBP is thought to destroy the adsorbed protection layer of 4-TBP on the TiO2 surface.It is concluded that addition of 4-TBP or other N-additives to the DSC electrolyte is important to enhance the dye life time at elevated temperatures. However, addition of Li+ to the electrolyte should be avoided if the wish is to construct DSCs with high thermal stability.

KW - lithium ions

KW - Dye-sensitized solar cells

U2 - 10.1016/j.solener.2012.11.012

DO - 10.1016/j.solener.2012.11.012

M3 - Journal article

VL - 88

SP - 23

EP - 30

JO - Solar Energy

JF - Solar Energy

SN - 0038-092X

ER -