We report exceptional electrochemical specific capacitance (640 F g⁻¹) for polythiophene (PTh) infiltrated into TiO₂ nanotubes (TNTs) by a controlled electropolymerization route. The resulting PTh–TNTs also exhibit excellent electrochemical behavior with long-term stability. This reproducible and superior performance of PTh–TNT electrodes makes them attractive candidates for energy storage.

The flexible-wire shaped all-solid-state-supercapacitors developed by electropolymerization of polythiophene show high capacitive performance of 71.84 mF cm ⁻² and ultra-high energy density of 23.11 μW h cm ⁻² using a wide operational potential window of 1.8 V.

A facile formation of 1D polythiophene nanofibers is proposed by an electropolymerization reaction into the hollow matrix of TiO₂ nanotube arrays.