4.6 Article Proceedings Paper

Multi-component eutectic salts to enhance the conductivity of solvent-free ionic liquid electrolytes for dye-sensitized solar cells

Journal

ELECTROCHIMICA ACTA
Volume 314, Issue -, Pages 219-226

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.05.055

Keywords

Ionic liquid; Eutectic salt; Conductivity; Solvent-free electrolyte; Dye-sensitized solar cells

Funding

  1. National Natural Science Foundation of China [21504061, 21671141]
  2. 973 Program- the National Basic Research Program of China Special Funds for the Chief Young Scientist [2015CB358600]
  3. Priority Academic Program Development (PAPDU) of Jiangsu Higher Education Institutions for Optical Engineering in Soochow University
  4. Jiangsu collaborative innovation center for photovoltaic science and engineering in Changzhou University
  5. Hong Kong Scholars Program [HKSP 2017-065]

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Ionic liquids (ILs) possess intrinsic nonvolatility, low flammability, high ionic conductivity, high thermal and chemical stability, rendering themselves as excellent candidates for next generation dye-sensitized solar cells (DSSCs). Further improving the ionic conductivity of ionic liquid electrolytes is critical to the performance enhancement of DSSCs. Here, multi-component eutectic salts by mixing four ILs are proposed to achieve higher ionic conductivity compared to the individual one. In addition, the effect of mixing strategy on the eutectic salts was systematically investigated by diverse structural, thermal, electrochemical and photovoltaic characterization in detailed. It revealed that mixing strategy could not only tune the solid-state property of individual ILs to liquid-state eutectic salts, but also greatly improve the ionic conductivity of final multi-component eutectic salts. Thus, based on the multi-component eutectic salt, a power conversion efficiency (PCE) of 4.81% could be obtained by the resultant device. Moreover, the DSSCs with multi-component eutectic salt also display better stability than the referenced device with volatile organic solvent. The mixing eutectic salts offer us a feasible strategy to design high ionic conductive electrolytes for high performance dye-sensitized solar cells. (C) 2019 Elsevier Ltd. All rights reserved.

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