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

Nguyen Tuyet Phuong, Poul Erik Hansen, Torben Lund

Publikation: KonferencebidragPosterForskning


The ruthenium dyes N719, Z907 and C106 with the general structures [RuLL’(NCS)2)] degrade slowly at elevated temperatures (t > 80 ˚C) on the surface of nano-sized TiO2 particles. The degradation takes place by reversible nucleophilic substitution reactions in which one of the thiocyanate ligands is replaced with either the nitrogen additive, e.g. 4-tert-butylpyridine (4-TBP) , or the solvent, e.g. 3-methoxypropionitrile (3-MPN) (eqs. (1)-(3)) [1-3].
In this work, we show that the degradation process of [RuLL´(NCS)2] and the inherent kinetics are highly dependent on the composition of the liquid electrolyte. Various electrolyte compositions with varying concentrations of 4-TBP, Li+ ions and I3- were investigated and their effects on the kinetics of N719-degradation reactions as well as the profile of N719-degradation products were studied.
Thermal stability experiments were performed at 100 ºC and are based on simple test-tube experiments carried out in colloidal solutions of N719-loaded TiO2 particles (TiO2|N719). The dye degradation was followed by the use of HPLC-coupled electrospray mass spectrometry and investigations of the formation of complexes between Li+ ions and 4-TBP was analyzed by nuclear magnetic resonance (NMR) spectroscopy. The aim of this work was to better understand the limited thermal stability of RuLL´(NCS)2 dyes in DSC devices prepared with liquid electrolytes so-called “non-robust” electrolytes and to be able to optimize the electrolyte.
Publikationsdato6 maj 2012
Antal sider1
StatusUdgivet - 6 maj 2012
Begivenhed4th international Conference on Hybrid and Organic Photovoltaics - Uppsala, El Salvador
Varighed: 6 maj 20129 maj 2012


Konference4th international Conference on Hybrid and Organic Photovoltaics
Land/OmrådeEl Salvador


  • Dye-sensitized solar cells

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