Triiodide

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H J Gores - One of the best experts on this subject based on the ideXlab platform.

  • characterisation of dssc electrolytes based on 1 ethyl 3 methylimidazolium dicyanamide measurement of Triiodide diffusion coefficient viscosity and photovoltaic performance
    Journal of Photochemistry and Photobiology A-chemistry, 2008
    Co-Authors: Philipp Wachter, Markus Zistler, Peter Wasserscheid, Andreas Hinsch, Christian Schreiner, Marko Berginc, Ursa Opara Krasovec, Dirk Gerhard, H J Gores
    Abstract:

    Abstract A comprehensive characterisation of an ionic liquid based electrolyte for dye-sensitised solar cells (DSSC) was performed by determination of Triiodide diffusion coefficients, viscosities and photovoltaic performances. The electrolyte, consisting of 1-ethyl-3-methylimidazolium dicyanamide, 1-methyl-3-propylimidazolium iodide (MPII), and iodine, was examined at varying ionic liquid molar ratio and fixed iodine concentration, as well as at fixed ionic liquid molar ratio and varying iodine concentration. All measurements were conducted at controlled temperature over a broad temperature range to analyse the electrolyte properties in view of thermal stress of the DSSC during later practical application. The Triiodide diffusion coefficient increases with decreasing MPII concentration or increasing temperature, caused by decreasing electrolyte viscosity. Additionally, strong non-Stokesian behaviour over the whole ionic liquid mixing range was found, decreasing at higher temperatures. Photovoltaic measurements showed that the DSSC efficiency is limited by Triiodide diffusion at low temperatures and low iodine concentrations whereas at high temperatures it is limited by recombination processes, leading to a maximum for DSSC efficiency at a certain temperature. The exchange between diffusion limitation of DSSC efficiency and limitation by recombination and therefore the maximum for DSSC efficiency is shifted to lower temperatures by increasing iodine concentration.

  • comparison of electrochemical methods for Triiodide diffusion coefficient measurements and observation of non stokesian diffusion behaviour in binary mixtures of two ionic liquids
    Electrochimica Acta, 2006
    Co-Authors: Markus Zistler, Philipp Wachter, Peter Wasserscheid, D Gerhard, Andreas Hinsch, R Sastrawan, H J Gores
    Abstract:

    Abstract Results of diffusion coefficient measurements of Triiodide in a mixture of two ionic liquids (1-methyl-3-propylimidazolium iodide and 1-butyl-3-methylimidazolium tetrafluoroborate) at 25 °C are described in this paper. Four electrochemical methods for measuring diffusion coefficients of Triiodide were evaluated for their reliability and performance, including impedance spectroscopy and polarization measurements at thin layer cells as well as cyclic voltammetry and chronoamperometry at microelectrodes of different radii. Viscosities of the blends were measured to investigate the transport behaviour of Triiodide ions used in Gratzel-type dye-sensitized solar cells.

Shouwu Guo - One of the best experts on this subject based on the ideXlab platform.

Philipp Wachter - One of the best experts on this subject based on the ideXlab platform.

  • characterisation of dssc electrolytes based on 1 ethyl 3 methylimidazolium dicyanamide measurement of Triiodide diffusion coefficient viscosity and photovoltaic performance
    Journal of Photochemistry and Photobiology A-chemistry, 2008
    Co-Authors: Philipp Wachter, Markus Zistler, Peter Wasserscheid, Andreas Hinsch, Christian Schreiner, Marko Berginc, Ursa Opara Krasovec, Dirk Gerhard, H J Gores
    Abstract:

    Abstract A comprehensive characterisation of an ionic liquid based electrolyte for dye-sensitised solar cells (DSSC) was performed by determination of Triiodide diffusion coefficients, viscosities and photovoltaic performances. The electrolyte, consisting of 1-ethyl-3-methylimidazolium dicyanamide, 1-methyl-3-propylimidazolium iodide (MPII), and iodine, was examined at varying ionic liquid molar ratio and fixed iodine concentration, as well as at fixed ionic liquid molar ratio and varying iodine concentration. All measurements were conducted at controlled temperature over a broad temperature range to analyse the electrolyte properties in view of thermal stress of the DSSC during later practical application. The Triiodide diffusion coefficient increases with decreasing MPII concentration or increasing temperature, caused by decreasing electrolyte viscosity. Additionally, strong non-Stokesian behaviour over the whole ionic liquid mixing range was found, decreasing at higher temperatures. Photovoltaic measurements showed that the DSSC efficiency is limited by Triiodide diffusion at low temperatures and low iodine concentrations whereas at high temperatures it is limited by recombination processes, leading to a maximum for DSSC efficiency at a certain temperature. The exchange between diffusion limitation of DSSC efficiency and limitation by recombination and therefore the maximum for DSSC efficiency is shifted to lower temperatures by increasing iodine concentration.

  • comparison of electrochemical methods for Triiodide diffusion coefficient measurements and observation of non stokesian diffusion behaviour in binary mixtures of two ionic liquids
    Electrochimica Acta, 2006
    Co-Authors: Markus Zistler, Philipp Wachter, Peter Wasserscheid, D Gerhard, Andreas Hinsch, R Sastrawan, H J Gores
    Abstract:

    Abstract Results of diffusion coefficient measurements of Triiodide in a mixture of two ionic liquids (1-methyl-3-propylimidazolium iodide and 1-butyl-3-methylimidazolium tetrafluoroborate) at 25 °C are described in this paper. Four electrochemical methods for measuring diffusion coefficients of Triiodide were evaluated for their reliability and performance, including impedance spectroscopy and polarization measurements at thin layer cells as well as cyclic voltammetry and chronoamperometry at microelectrodes of different radii. Viscosities of the blends were measured to investigate the transport behaviour of Triiodide ions used in Gratzel-type dye-sensitized solar cells.

Markus Zistler - One of the best experts on this subject based on the ideXlab platform.

  • characterisation of dssc electrolytes based on 1 ethyl 3 methylimidazolium dicyanamide measurement of Triiodide diffusion coefficient viscosity and photovoltaic performance
    Journal of Photochemistry and Photobiology A-chemistry, 2008
    Co-Authors: Philipp Wachter, Markus Zistler, Peter Wasserscheid, Andreas Hinsch, Christian Schreiner, Marko Berginc, Ursa Opara Krasovec, Dirk Gerhard, H J Gores
    Abstract:

    Abstract A comprehensive characterisation of an ionic liquid based electrolyte for dye-sensitised solar cells (DSSC) was performed by determination of Triiodide diffusion coefficients, viscosities and photovoltaic performances. The electrolyte, consisting of 1-ethyl-3-methylimidazolium dicyanamide, 1-methyl-3-propylimidazolium iodide (MPII), and iodine, was examined at varying ionic liquid molar ratio and fixed iodine concentration, as well as at fixed ionic liquid molar ratio and varying iodine concentration. All measurements were conducted at controlled temperature over a broad temperature range to analyse the electrolyte properties in view of thermal stress of the DSSC during later practical application. The Triiodide diffusion coefficient increases with decreasing MPII concentration or increasing temperature, caused by decreasing electrolyte viscosity. Additionally, strong non-Stokesian behaviour over the whole ionic liquid mixing range was found, decreasing at higher temperatures. Photovoltaic measurements showed that the DSSC efficiency is limited by Triiodide diffusion at low temperatures and low iodine concentrations whereas at high temperatures it is limited by recombination processes, leading to a maximum for DSSC efficiency at a certain temperature. The exchange between diffusion limitation of DSSC efficiency and limitation by recombination and therefore the maximum for DSSC efficiency is shifted to lower temperatures by increasing iodine concentration.

  • comparison of electrochemical methods for Triiodide diffusion coefficient measurements and observation of non stokesian diffusion behaviour in binary mixtures of two ionic liquids
    Electrochimica Acta, 2006
    Co-Authors: Markus Zistler, Philipp Wachter, Peter Wasserscheid, D Gerhard, Andreas Hinsch, R Sastrawan, H J Gores
    Abstract:

    Abstract Results of diffusion coefficient measurements of Triiodide in a mixture of two ionic liquids (1-methyl-3-propylimidazolium iodide and 1-butyl-3-methylimidazolium tetrafluoroborate) at 25 °C are described in this paper. Four electrochemical methods for measuring diffusion coefficients of Triiodide were evaluated for their reliability and performance, including impedance spectroscopy and polarization measurements at thin layer cells as well as cyclic voltammetry and chronoamperometry at microelectrodes of different radii. Viscosities of the blends were measured to investigate the transport behaviour of Triiodide ions used in Gratzel-type dye-sensitized solar cells.

Leyu Wang - One of the best experts on this subject based on the ideXlab platform.

  • nickel based single atom catalyst toward Triiodide reduction reaction in hybrid photovoltaics
    ACS Sustainable Chemistry & Engineering, 2021
    Co-Authors: Di Lin, Yuan Lin, Rui Jiang, Song Hong, Zhihai Cheng, Jianfeng Guo, Yingying Zhao, Xiong Yin, Leyu Wang
    Abstract:

    It is very significant to obtain highly efficient, cost-effective, and durable electrocatalysts toward Triiodide reduction reaction (TRR) in hybrid photovoltaics. In this study, a nickel-based sing...

  • nickel based single atom catalyst toward Triiodide reduction reaction in hybrid photovoltaics
    ACS Sustainable Chemistry & Engineering, 2021
    Co-Authors: Di Lin, Yuan Lin, Rui Jiang, Song Hong, Zhihai Cheng, Jianfeng Guo, Yingying Zhao, Xiong Yin, Leyu Wang
    Abstract:

    It is very significant to obtain highly efficient, cost-effective, and durable electrocatalysts toward Triiodide reduction reaction (TRR) in hybrid photovoltaics. In this study, a nickel-based single-atom catalyst (SAC) (Ni-SAC) was prepared by the facile carbonization of NiPc@ZIF-8 and explored as a highly efficient Pt-free catalyst for TRR. During the carbonization process, the Ni species were separated by coordinate nitrogen atoms and distributed homogeneously within the porous carbon matrix, with the formation of the atomically dispersed Ni–N₄ active sites, revealed by the X-ray absorption fine structure and high-angle annular dark-field scanning transmission electron microscopy. Compared to the reference porous nitrogen-doped carbon, Ni-SAC exhibited superior catalytic activity toward TRR. More importantly, Ni-SAC possessed better stability over the Triiodide/iodide redox couple than the Pt counterpart during the stability test. The resultant solar cell presented an efficiency of 7.42%, comparable to that of the Pt-based device (7.69%). Additionally, the Kelvin probe force microscopy measurement revealed that the enhanced catalytic activity of Ni-SAC originated from the moderate energy level matching with the Triiodide/iodide redox couple. The formation of Ni–N₄ active sites within the carbon matrix promoted the electron transferring at the interfaces of the catalyst/electrolyte. All results demonstrated that the SAC could be one of the Pt-free catalysts toward efficient TRR in hybrid photovoltaics.