Tailoring the electrochemical properties of LaNiO₃ by Mn–Ru Co-doping for enhanced supercapacitor performance

Designing a unique and cost-effective co-dopped nanostructure electrode material for efficient performance in energy storage devices is challenging. Herein, an alternate strategy employed to develop the LaMn_xRu_yNi_{1-(x + y)}O₃ (x = 0.00, 0.02, 0.05, 0.08) and (y = 0.00, 0.08, 0.05, 0.02), perovskite as efficient electrode materials. The hexagonal crystal structures were confirmed via X-ray diffraction (XRD), which revealed enhancement in lattice constants as the Ru concentration increased. The X-ray photoelectron spectroscopy (XPS) confirmed the presence of La³⁺, Ni³⁺, Ni²⁺, Ru³⁺, Mn²⁺, and O²⁻ ions on the surface of synthesized electrode material (LaMn_xRu_yNi_{1-(x + y)}O₃). An asymmetric supercapacitor (LaMn_0.02Ru_0.08Ni_0.9O₃/separator/AC) was fabricated and tested in two electrode systems. Our supercapacitor shows excellent specific capacitance (C_sp), energy (E_d), and power density (P_d) of 81.48 F/g, 82.5 Whkg⁻¹, and 1350 Wkg^-1, respectively. Our electrode material (LaMn_0.02Ru_0.08Ni_0.9O₃) has superior electrochemical properties, making it an alternative candidate for next-generation electrodes in asymmetric supercapacitors.