Electrodeposition of hierarchical NiZn layered double hydroxide nanosheet arrays on polyaniline for enhanced supercapacitor performance

Abstract

Current research in energy storage is primarily focused on innovating affordable electroactive materials with superior specific capacitance. We introduce a two-step, successful approach for developing hierarchical, binder-free arrays of NiZn-layered double hydroxide (LDH) nanosheets on polyaniline-coated copper sheet. The NiZn-LDH/PANI/Cu electrode material's structural and surface properties were analyzed using techniques such as FESEM, HRTEM, XPS, and XRD. In a two-electrode supercapacitor (SC) setup, electrochemical evaluations revealed the outstanding performance of the electrode. The sample achieved a maximum energy density of 32 Wh kg⁻¹, a specific capacitance of 358.75 F g⁻¹, and impressive cycling stability, maintaining 90 % of its capacitance after 5000 cycles. These findings highlight the potential of the NiZn-LDH/PANI/Cu SC as a viable energy storage solution. By leveraging the synergistic effects of the composite materials, this approach not only enhances energy density and capacitance but also ensures long-term stability and reliability. Ultimately, this work contributes to the development of advanced SC technologies that can meet the increasing demands for efficient and sustainable energy storage systems.