In this work, core–shell nanocomposites based on CuCo₂S₄ an‎d ZIF-67 were synthesized with different architectures an‎d systematically characterized. Structural analyses (XRD, FT-IR, BET, FE-SEM/EDX) confirmed the successful formation of pure crystalline phases an‎d porous architectures. Interestingly, BET results revealed that the sample CuCo₂S₄@ZIF-67 (80:20) had the highest specific surface area (378 m² g⁻¹). In contrast ZIF-67@CuCo₂S₄ (20:80), despite its lower surface area (61 m² g⁻¹), exhibited superior electrochemical performance due to a balanced micro an‎d mesoporous structure that facilitated ion diffusion. Electrochemical tests (CV, GCD, EIS) demonstrated that electrode architecture plays a more critical role than surface area alone. The ZIF-67@CuCo₂S₄ (20:80) electrode achieved a remarkable specific capacitance of 501.08 F g⁻¹, attributed to the synergistic effects of the conductive CuCo₂S₄ shell an‎d the porous ZIF-67 core. The reverse configuration showed inferior performance. Moreover, the incorporation of polyaniline (PANI), though intended to enhance conductivity, resulted in decreased performance due to restricted ion access. These findings highlight the crucial role of nanostructure engineering in hybrid supercapacitors, where optimized core–shell architectures can overcome material limitations an‎d balance conductivity, porosity, an‎d pseudocapacitance. The synthesized electrodes belong to the category of hybrid supercapacitors, dominated by pseudocapacitive charge storage.

غلامحسين محمدنژاد شيرازي , مريم زارع

عليرضا علافچيان , مسعود عطاپور

كاظم كرمي , اسماعيل حيدري