Double-layered nano-composite of copper-manganese oxide/rGO-palladium for asymmetric supercapacitors

Aviraj M. Teli, Sonali A. Beknalkar, Vinayak V. Satale, Manesh A. Yewale, Rutuja U. Amate, Pritam J. Morankar, Yen Hsueh Wu, Hong Hyuk Kim, Jae cheol Shin

Research output: Contribution to journalArticlepeer-review

Abstract

We developed composite electrode materials by depositing reduced graphene oxide (rGO) and palladium (Pd)-integrated CuMn2O4 onto Ni-foam substrates using a facile, binder-free hydrothermal method. This work aimed to enhance the specific capacitance of CuMn2O4 electrodes for compact energy storage devices. The addition of rGO contributed electric double-layer capacitance (EDLC) and improved conductivity, while Pd acted as a redox catalyst, further boosting the electrochemical performance of CuMn2O4. The rGO and Pd effectively suppressed the agglomeration of CuMn2O4 nanostructures, transforming their morphology from nano-worms to nano-sheets and doublet nano-sheets. The optimized CMrGP composite electrode achieved a remarkable specific capacitance of 12.3 F/cm² (Cv = 76.6 F/cm³; C = 1.70 mA/cm³) at 8 mA/cm² within a 0–0.5 V potential window, driven primarily by diffusion-controlled mechanisms. An asymmetric supercapacitor device was fabricated using CMrGP as the positive electrode and activated carbon (AC) as the negative electrode. This device delivered a specific capacitance of 1.22 F/cm² and an energy density of 0.433 mWh/cm³ at a power density of 4 mW/cm² (5 mA current). It demonstrated excellent cycling stability, retaining 93.6 % of its initial capacitance and 91 % coulombic efficiency after 27,000 charge-discharge cycles.

Original languageEnglish
Article number178633
JournalJournal of Alloys and Compounds
Volume1014
DOIs
StatePublished - 5 Feb 2025

Keywords

  • Asymmetric device
  • Charge storage kinetics
  • Electrochemical performance
  • Excellent stability
  • RGO and Pd incorporated CuMnO composite

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