A Pseudocapacitive Nanohybrid of Nd-Doped CuGd ₂ O ₄ @Carbon Black as an Efficient Electrode Material for Supercapacitors

This investigation presents a porous nanostructure of a rare-earth-based Nd-doped CuGd 2 O 4 @CB nanohybrid as an efficient electrode material for supercapacitor applications. The nanomaterial was synthesized via a cost-effective microwave approach and characterized for its structural, morphological, and electrochemical performance. The electrochemical analyses, including galvanostatic charge–discharge and cyclic voltammetry, revealed a high specific capacitance and excellent cyclic stability. Specifically, the prepared CuGd 1.6 Nd 0.4 O 4 @CB nanostructure exhibited a specific capacitance of 1365.9 Fg 1– at a current density of 2 Ag 1– . With enhanced electrical conduction, the charge transfer resistance of the sample was 0.814 Ω, contributing to a superior electrochemical performance. The electrode material demonstrated a remarkable cyclic stability with 90% capacitance retention after 10,000 cycles. Moreover, the fabricated asymmetric device from CuGd 1.6 Nd 0.4 O 4 @CB had 205.17 Fg 1– specific capacitance and disclosed a commendable energy density of 41.03 Wh kg –1 at a power density of 720 W kg –1 . Such promising attributes of the Nd-doped CuGd 2 O 4 @CB nanohybrid structure position it as a compelling candidate for next-generation supercapacitors and integrated electronics due to its potential to create a significant impact in future energy storage systems.