1：Experimental Design and Method Selection:

The study involved the synthesis of symmetrical thiourea derivatives with an oxydianiline core and the preparation of a new gel electrolyte system using these additives along with a PEG–PPG–PEG block copolymer, PVDF, and an iodide/triiodide redox couple. The methodology included electrochemical impedance spectroscopy, UV-vis absorption spectroscopy, differential scanning calorimetry, and FTIR spectroscopy to evaluate the gel polymer electrolytes.

2：Sample Selection and Data Sources:

The samples included gel polymer electrolytes with and without thiourea additives, and the data was sourced from photovoltaic measurements and spectroscopic analyses.

3：List of Experimental Equipment and Materials:

The materials included PEG–PPG–PEG block copolymer, PVDF, KI, iodine, and thiourea additives. The equipment used included a UV-vis spectrophotometer, DSC, XRD, FTIR spectrometer, and electrochemical impedance spectroscopy setup.

4：Experimental Procedures and Operational Workflow:

The gel polymer electrolytes were prepared by mixing PEG–PPG–PEG and PVDF with propylene carbonate and acetonitrile, followed by the addition of KI, iodine, and additives. The mixture was stirred overnight at 80°C to obtain a homogenous gel polymer electrolyte. DSSCs were fabricated using TiO2 coated on an FTO plate and the gel polymer electrolyte.

5：Data Analysis Methods:

The data was analyzed using electrochemical impedance spectroscopy to determine conductance, UV-vis spectroscopy to evaluate the effect of I3? on DSSC performance, DSC to determine thermal behavior, and FTIR spectroscopy to assess vibrational variations.