A composite film of titanium disulfide/poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (TiS2/PEDOT:PSS) was deposited on a indium-doped tin oxide (ITO) conducting substrate by the drop coating technique, as the counter electrode (CE) of dye-sensitized solar cells (DSSCs). TiS 2 particles were well distributed in the polymer matrix of PEDOT:PSS and served as an electrocatalyst material for the redox reaction of iodide/triiodide ions (I-/I3-) with high conductivity and attractive catalytic ability. The TiS2/PEDOT:PSS composite CE showed good uniformity and provided a large electrochemical surface area, which resulted in a high cell efficiency (η) of 7.04%. The high efficiency of the cell with the TiS2/PEDOT:PSS composite CE could be a potential choice for replacing the expensive Pt CE. Scanning electron microscopy (SEM), atomic force microscopy (AFM) and energy dispersive X-ray spectroscopy (EDX) were used to characterize the morphology of different CEs, including Pt, bare TiS2, bare PEDOT:PSS and the TiS 2/PEDOT:PSS composite. The catalytic ability and electrochemical properties of the CEs were quantified by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), Tafel plots and rotating disk electrode (RDE) measurements. The high cell efficiency of DSSCs with the TiS2/PEDOT:PSS composite CE was verified by the incident photon-to-current conversion efficiency (IPCE) curves.
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)