Multifunctional RGO-Gd2O3:Eu3+ nanocomposites for supercapacitor and biosensor application

This study successfully synthesized pristine RGO-Gd2O3:Eu3+ nanocomposites (NCs) using a hydrothermal method, as confirmed by X-ray diffraction and TEM analysis. Cyclic voltammetry (CV) demonstrated that RGO-Gd2O3:Eu3+ NCs exhibited a superior specific capacitance (Csp) of 340 Fg⁻1 at a scan rate of 2 mV s⁻1. Impressively, the synthesized nanocomposites displayed high energy and power densities of 41 Wh/kg and 30000 W/kg, respectively, along with excellent capacity retention (91.12 %) and Coulombic efficiency (95.77 %). Modified glassy carbon electrodes (MGCEs) fabricated using these NCs showed promising electrochemical responses for dopamine (DA) detection at pH∼7. These findings highlight the potential of the developed electrode for both supercapacitor applications and DA sensing. [Display omitted] •RGO-Gd2O3:Eu3+ nanocomposite are synthesized by hydrothermal method.•⁠Structural and functional characterization of synthesized nanocomposites are performed using XRD, TEM, CH instrument.•⁠The significance of the synthesized materials is proven for supercapacitor and biosensor applications.•⁠RGO-Gd2O3:Eu3+ based nanocomposite can be utilized in wearable, electronics and smart sensor devices.