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Journal of Electrochemical Science and Engineering, Vol. 16 , 2026.

Original scientific paper

https://doi.org/10.5599/jese.2998

Tunable electrochemical properties of polyaniline/CuO/BaTiO3 nanocomposites for supercapacitor application

Geethu Joseph ; Material Science Research Lab, Department of Physics, St. Thomas College Palai, Kerala 686574, India
Aryadevi Gopinath ; Department of Physics, CMS College (Autonomous), Kottayam, Kerala, 686001, India
Veena Ros Mathew ; Material Science Research Lab, Department of Physics, St. Thomas College Palai, Kerala 686574, India
Alex Jose ; Material Science Research Lab, Department of Physics, St. Thomas College Palai, Kerala 686574, India
Alex Joseph ; Department of Chemistry, Newman College, Thodupuzha, Idukki, Kerala ,685585, India
Santhosh Kumar Raghavan Pillai ; Department of Physics, St. George’s College Aruvithura, Kottayam, Kerala, 686122, India
Esha Devaraj Suja ; Material Science Research Lab, Department of Physics, St. Thomas College Palai, Kerala 686574, India
Ginson P. Joseph ; Material Science Research Lab, Department of Physics, St. Thomas College Palai, Kerala 686574, India *

* Corresponding author.

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Abstract

Revolutionizing energy storage demands innovative strategies that transcend the conven­ti­onal boundaries of electrode design. Here, we unveil a powerful approach that harnesses the synergistic interplay between dielectric and conductive nanophases to unlock unpre­cedented charge storage performance in polymeric supercapacitors. By individually synthe­sizing copper oxide (CuO) and barium titanate (BaTiO3) nanoparticles and strategically embedding them into a polyaniline (PANI) matrix, we engineered two finely tuned ternary nano­composites: PCB5 (10 wt.% CuO, 5 wt.% BaTiO3) and PCB10 (5 wt.% CuO, 10 wt.% BaTiO3). Advanced structural and spectroscopic analyses (X-ray diffraction, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, Ramanspectroscopy) confirmed the successful integration of the nano­phases, while dielectric studies revealed distinct variations in dielectric constant and inter­facial polarization behaviour depending on nanoparticle ratios. Among the composites, PCB5 showed the most balanced electrochemical performance, with a specific capacitance of 271.67 F g-¹, outperforming pristine PANI and its BaTiO3-rich counterpart. Electrochemical impedance spectroscopy further confirmed the low series and charge-transfer resistances of the PCB5 composite sam­ple, reflecting its efficient ion/electron trans­port pathways. Furthermore, BET analysis showed an increased surface area (31.37 m² g-¹) compared to pristine PANI (24.08 m² g-¹), providing additional electroactive interfaces for charge accumulation. These findings esta­blish, for the first time, a dielectric-conductive co-engineering paradigm in PANI nano­com­po­sites, where carefully optimized filler ratios act as a dual-function booster of both dielectric constant and electrochemical kinetics. This extraordinary synergy paves the way for trans­for­mative next-generation high-energy, high-power supercapacitors with tunable multifunctionality.

Keywords

Dielectric; ferroelectric ceramics; polyaniline matrix; energy storage; specific capacitance

Hrčak ID:

344851

URI

https://hrcak.srce.hr/344851

Publication date:

24.2.2026.

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