Akademik Veri Yönetim Sistemi
Surfaces and Interfaces, cilt.88, ss.1-18, 2026 (SCI-Expanded, Scopus)
This work presents the design and evaluation of PANI-based electrodes modified with reduced graphene oxide (rGO) and transition metal oxides (NiO and CuO) for advanced energy storage. The addition of rGO improves electronic conductivity, while NiO and CuO enhance pseudocapacitive behavior, resulting in superior electrochemical performance. The dual metal oxide hybrid electrode, CuO:NiO@rGO:PANI/NF, achieves the highest energy and power densities among all tested configurations, demonstrating a clear synergistic effect. Five electrodes-PANI/NF, rGO:PANI/NF, NiO@rGO:PANI/NF, CuO@rGO:PANI/NF, and CuO:NiO@rGO:PANI/NF-are produced and characterized by SEM, EDS, FTIR, XRD, and XPS, confirming their morphology, composition, and successful incorporation of all components. Linear sweep voltammetry measurements in 0.5 M H2SO4 show that the Tafel slope decreases from 118.1 mV dec−1 for PANI/NF to 49.7 mV dec−1 for CuO:NiO@rGO:PANI/NF, approaching the value of Pt/C (45.8 mV/dec), indicating significantly improved HER kinetics. The enhanced performance is attributed to the interface-engineered synergy, in which the CuO-NiO heterojunctions provide abundant active sites for HER, while the oxide-rGO:PANI interfaces facilitate rapid electron transport and structural robustness, as evidenced by 91.9% diffusion-controlled charge storage in the ASC device. To enhance energy density, an asymmetric configuration employs a design that utilizes the CuO:NiO@rGO:PANI/NF heterostructure as the high-capacity positive electrode. This electrode is balanced against an activated carbon fabric negative electrode, with both components immersed in a 5 M KOH electrolyte and separated by a cellulose paper barrier. This device demonstrates an impressive energy density of 32.7 Wh kg⁻1 at a current density of 16 A g⁻1, achieved a maximum power output of 4745.6 W kg⁻1 at 40 A g⁻1, and maintained 91.6% of its initial capacitance over 10,000 charge-discharge cycles, highlighting its excellent performance and long-term stability for high-performance energy storage applications.