1：Experimental Design and Method Selection:

The study involved the synthesis of PM4EOT and PM4EOT/TiO2 composites via in situ oxidative chemical polymerization using FeCl3 as an oxidant. The structural, crystallographic, morphological, optical, and thermal properties of the nanocomposites were characterized using FTIR, Raman, XPS, XRD, SEM, TEM, UV–Vis, and TGA techniques.

2：Sample Selection and Data Sources:

The samples included pure PM4EOT, TiO2 nanoparticles, and PM4EOT/TiO2 composites with varying weight ratios.

3：List of Experimental Equipment and Materials:

Equipment included a Thermo Nicolet 360 spectrometer, Varian Cary 300 UV–Vis spectrophotometer, TA Q5000IR, ThermoFisher DXR532 apparatus, Rigaku Ultima IV advanced diffractometer, Hitachi su8010 field emitting scanning electron microscope, JEOL JEM-2100 UHR microscope, and AXIS Ultra Kratos photoelectron spectrometer. Materials included 3-methoxythiophene, tetraethylene glycol methyl ether, TiO2 nanoparticles, and FeCl

4：Experimental Procedures and Operational Workflow:

The synthesis involved oxidative polymerization of M4EOT monomer with TiO2 nanoparticles, followed by characterization and electrochemical testing.

5：Data Analysis Methods:

Electrochemical performance was evaluated using cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy.