High-performance 3D flower-like NiCo LDH and N-doped pea-derived graphitic carbon composite for supercapacitor application

Developing electrochemical energy storage systems that combine high energy and power densities with extended cycling stability is critical for advancing energy storage technologies. In this study, we synthesized a novel Nickel Cobalt layered double hydroxide (NiCo LDH) and nitrogen-doped Pisum sativum derived activated graphitic carbon (NPSAC) composite as an efficient electrode material for high-performance supercapacitors (SCs). The synthesized materials were subsequently characterized using various characterization techniques, including X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, Field emission scanning electron microscopy (FESEM), and X-ray photoelectron spectroscopy (XPS). Additionally, the electrochemical performances of the individual and composite materials were evaluated using a three-electrode assembly in aqueous 3 M KOH. The NiCo LDH/NPSAC electrode material demonstrated exceptional specific capacitance (Csp) of 2100 F g⁻¹ at a scan rate of 5 mV s⁻¹ and 1142 F g⁻¹ at current density of 10 mA cm⁻² also achieved remarkable cyclic stability with 94 % capacitance retention after 10,000 charge-discharge cycles. Moreover, it exhibited a high energy density of 35 Wh kg⁻¹ at a power density of 1818 W kg⁻¹ respectively.