2026-10-11T18:02:12Zhttps://www.radar-service.eu/oai/OAIHandler

10.35097/yc4u08x9mrcnt38b2026-10-09T10:56:55Zradar4kit

https://dx.doi.org/10.35097/yc4u08x9mrcnt38b Khan, Imran ul Haq Ali Shah, Anwar Bilal, Salma Röse, Philipp Investigation of Energy Storage Performance and Cycling Stability of Electrochemically Synthesized PANI–ZnFe2O4 Electrodes Karlsruhe Institute of Technology 2025 Engineering dataset Dataset info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-sa/4.0/legalcode Conducting polymer-metal oxide hybrids are promising electrode materials for supercapacitors, yet achieving a balance between high capacitance and long-term stability remains challenging. In this work, polyaniline (PANI) - zinc ferrite (ZnFe₂O₄) composites were synthesized by in situ electrochemical polymerization of aniline with controlled deposition duration for ZnFe2O4-nanoparticle incorporation. Structural and spectroscopic characterization confirmed uniform dispersion of ZnFe2O4 within the polymer matrix and the formation of fibrous nanostructures. Electrochemical analysis revealed a progressive enhancement of redox activity and charge storage with increasing ZnFe2O4 content. The optimized composite exhibited a specific capacitance of up to 1402 F g⁻¹ at 1 A g⁻¹, together with an energy density of 141.9 Wh kg⁻¹ and a power density of 404.9 W kg⁻¹. When assembled into a symmetric supercapacitor, the PANI-zinc ferrite composite retained 97.6% of its initial capacitance after 10,000 charge–discharge cycles. Electrochemical impedance spectroscopy further indicated that structural degradation under accelerated aging is primarily associated with particle and polymer chain cracking/breaking, leading to increased mass transport resistance, thereby reducing the energy storage capability. Conducting polymer-metal oxide hybrids are promising electrode materials for supercapacitors, yet achieving a balance between high capacitance and long-term stability remains challenging. In this work, polyaniline (PANI) - zinc ferrite (ZnFe₂O₄) composites were synthesized by in situ electrochemical polymerization of aniline with controlled deposition duration for ZnFe2O4-nanoparticle incorporation. Structural and spectroscopic characterization confirmed uniform dispersion of ZnFe2O4 within the polymer matrix and the formation of fibrous nanostructures. Electrochemical analysis revealed a progressive enhancement of redox activity and charge storage with increasing ZnFe2O4 content. The optimized composite exhibited a specific capacitance of up to 1402 F g⁻¹ at 1 A g⁻¹, together with an energy density of 141.9 Wh kg⁻¹ and a power density of 404.9 W kg⁻¹. When assembled into a symmetric supercapacitor, the PANI-zinc ferrite composite retained 97.6% of its initial capacitance after 10,000 charge–discharge cycles. Electrochemical impedance spectroscopy further indicated that structural degradation under accelerated aging is primarily associated with particle and polymer chain cracking/breaking, leading to increased mass transport resistance, thereby reducing the energy storage capability. The research data is structured with respect to the Figure numbers in the manuscript. Figure_2: Synthesis of PANI and PANI@ZF composite electrodes Figure_3: XRD-analysis of all synthesized composite electrodes and reference sprectra Figure 4: FT-IR data of all synthesized composite electrodes Figure 5: SEM images of PANI and PANI@ZF composite electrodes Figure 6: Electrochemical analysis: a) CV of PANI, PANI@ZF1, PANI@ZF2 and PANI@ZF3; b) PANI@ZF3 at different scan rates; c) tafel plots of PANI@ZF3; d) specific capcitances calculated by CV spectra of PANI, PANI@ZF1, PANI@ZF2 and PANI@ZF3; e) Galvanostatic charge/discharge experiments of PANI, PANI@ZF1, PANI@ZF2 and PANI@ZF3; f) galvanostatic charge/discharge experiments at different current densities for PANI@ZF3; g) specific capacitances for PANI, PANI@ZF1, PANI@ZF2 and PANI@ZF3 at different current densities FIgure 7: a) Ragone diagram of PANI@ZF3 as symmetrical supercapacitor; b) coulombic efficiency of PANI@ZF3 at different current densities during galvanostatic charge/discharge Figure 8: a) Charge/Discharge cycles of PANI@ZF3 at different cycling numbers; b) specific capacitance of PANI@ZF3 over varying cyclinc numbers Figure 9: Impedance spectra at different SOC: a) SOC = 0; b) SOC = 50; c) SOC = 100; d) comparison of all spectra Figure 10: Impedance spectra at different cycle numbers: 2000, 4000, 8000, and 10000 cycles Figure to table A2: EDX spectra of PANI, PANI@ZF1, PANI@ZF2 and PANI@ZF3 electro-polymerization zinc ferrite polymer electrodes cycling stability degradation https://publikationen.bibliothek.kit.edu/1000184329 application/x-tar