Tunability of Porous CuCo₂O₄ Architectures as High‐Performance Electrode Materials for Supercapacitors

Abstract

Copper cobaltite (CuCo2O4) porous structures with different morphologies are prepared through a hydrothermal method and subsequent annealing process. The tunability of morphologies is succeeded by simply regulation of solvent medium and amount of the polyvinylpyrrolidone (PVP) which is served as structure directing agent. All the prepared samples have a mesoporous nature. Specifically, the CuCo2O4‐porous structures with flowers morphology have a higher surface area (43.2 m2 g−1) and porosity (0.18 cm3 g−1) than the other porous nano structures such as flakes, blades and wires. The maximum specific capacity of CuCo2O4‐Flowers is 466.4 C g−1 at a current density of 2 A g−1. The cycling stability of CuCo2O4‐Flowers shows capacity retention of 86.3 % at a high current density of 15 A g−1 after completion of 5000 charge‐discharge cycles. The electrochemical results demonstrate that the CuCo2O4‐Flower shows superior performance than the CuCo2O4‐Flakes, Blade and Wires.

Boosting the Electrochemical Performance of Mn-doped CuCo2O4/CuO Heterostructures for All-Solid-State Asymmetric Battery-type Supercapacitors

“…The distinct redox peaks for three heterostructures electrodes can be attributed to reversible redox processes of Cu 2+ /Cu + or Co 3+ /Co 2+ in KOH solution, which is highly congruent with the feature of battery-type electrode material. 32 The following are the redox reactions that are related: Furthermore, the anodic and cathodic peaks of the electrodes gradually migrated toward the lower potential side as the Mn content of the electrodes was increased, implying that Mn doping in electrodes might reduce polarization behavior. 13 Figure 6a compares the CV curve of the undoped CCO, doped MnCCO-I, and MnCCO-II at the scan rate of 50 mV s -1 .…”

Hierarchical Graphitic Carbon Nitride–Zeolitic Imidazolate Framework-67 Nanostructures Adorned on Calcium Molybdate Nanospheres for High-Performance Supercapacitor Applications

“…The CMO–GCN–ZIF electrode exhibited the longest discharging time compared to that of pristine CMO, CMO–GCN, and CMO–ZIF. The specific capacity ( C s ) of the electrodes was estimated using the equation shown as follows: − C s = I Δ t m where I stands for the applied current, Δ t is the interval between the initial and final discharge times, and m represents the active mass of the electrode.…”

Advances in copper cobaltate-based nanomaterial electrodes for supercapacitor applications

“…4n). 123 Aside from mesoporous materials, well-designed hollow structures are also ideal materials for the fabrication of energy storage and conversion devices with excellent specific capacity and high cycle life. [124][125][126] Li et al synthesized tripleshelled hollow CuCo 2 O 4 microspheres using solvothermal and calcination processes.…”