Hierarchical sea-urchin anchored on rGO sheets decorated with layered double hydroxide nanoflowers: A novel electrode for enhanced supercapacitor performance

Mn Co layered double hydroxide (Mn Co LDH) has shown promising potential as an electrode material for supercapacitors due to its inherent layered structure. However, its performance is limited by poor electrical conductivity. Bimetallic oxides, particularly CuCo₂O₄, offer unique advantages such as diverse morphologies and pseudocapacitive properties, which can enhance the electrochemical performance of Mn Co LDH. Additionally, reduced graphene oxide (rGO) acts as a conductive bridge between Mn Co LDH and CuCo₂O₄. It serves as an important component due to its sp 2 -hybridized carbon structure, which provides a large π-electron network and enhanced electron delocalization. Herein, we report the synthesis of hierarchical sea-urchin-like CuCo₂O₄ anchored on rGO sheets and decorated with Mn Co LDH nanoflowers via a hydrothermal process followed by calcination. The unique hierarchical architecture of the sea-urchin-like CuCo₂O₄ and nanoflower-like Mn Co LDH significantly enhances the supercapacitive performance. The CuCo₂O₄/rGO/Mn-Co LDH electrode delivered specific capacitance of 1408 F g −1 at 1 A g −1 . Furthermore, the asymmetric supercapacitor (ASC) device based on CuCo₂O₄/rGO/Mn-Co LDH achieved an energy density of 56.8 Wh kg −1 at a power density of 740 W kg −1 . In addition, a zinc-ion hybrid supercapacitor (ZHSC) device fabricated using CuCo₂O₄/rGO/Mn-Co LDH exhibited an energy density of 90 Wh kg −1 at a power density of 753 W kg −1 . This study highlights the significant potential of CuCo₂O₄/rGO/Mn-Co LDH as an electrode material for high-performance supercapacitor applications.