A newer electrochemical technique to use europium-doped CaZrO3 nanoparticles: Dopamine sensing and energy storage application

[Display omitted] •Europium-Doped CaZrO3 (ECZO) nanoparticles are synthesized via combustion method.•Low LOD (0.455 µM) and 92 % stable in sensing dopamine.•High specific capacitance of 243 F/g and energy density of 48.6 Wh/kg.•Achieved 86.48% capacity retention, 92% coulombic efficiency for 5000 cycles. This research focuses on the critical need for more efficient and stable materials in biosensing and energy storage, driven by the growing demand for accurate medical diagnostics and renewable energy solutions. In this study, Europium (Eu) doping was employed to enhance the performance of CaZrO3 for dopamine detection and supercapacitor applications. Europium-doped CaZrO3 (ECZO) nanoparticles were synthesized and incorporated into a modified carbon paste electrode (MCPE) for dopamine detection. Cyclic voltammetry (CV) and Differential Pulse Voltammetry (DPV) analyses revealed significant improvements in dopamine detection, with ECZO-MCPE achieving a peak current of 78.9 µA, a detection limit of 0.455 µM, and a quantification limit of 1.514 µM. The ECZO-MCPE also demonstrated remarkable stability, retaining 92 % of its activity after 20 cycles. In supercapacitor applications, ECZO NPs exhibited a specific capacitance of 243 F/g at a current density of 0.0005 A and an energy density of 48.6 Wh/kg at a power density of 1000 W/kg, with 86.48 % capacitance retention after 5000 charge–discharge cycles. These findings indicate that ECZO NPs are highly effective in enhancing electrode performance and hold promise for future advancements in biosensing and energy storage technologies.