Synergistic effects of niobium phosphate/tungsten oxide core-shell nanocomposites for asymmetric supercapacitor

Pritam J. Morankar, Rutuja U. Amate, Aviraj M. Teli, Sonali A. Beknalkar, Chan Wook Jeon

Research output: Contribution to journalArticlepeer-review

Abstract

The energy requirements of modern civilization necessitate the use of efficient renewable energies. Therefore, this research assessed the effectiveness of newly developed niobium phosphate (NbPO5)/tungsten oxide (WO3) core-shell nanocomposite thin film electrodes fabricated through a combination of facile hydrothermal synthesis with electrodeposition method as promising energy storage devices. The investigation involved a thorough analysis of the optimization of reaction time for NbPO5 to explore the resulting modifications in their structural, morphological, and energy storage properties. Raman spectroscopy offers a detailed exploration of vibrational modes and structural characteristics while, X-ray photoelectron spectroscopy (XPS) spectra provide comprehensive information on the chemical composition, elemental state, and surface properties. NbPO5/WO3 core-shell electrode presented variable surface morphologies in accordance with the different synthesis times. The optimized NbP-W-6 sample demonstrated excellent energy storage performance, with a high areal capacitance of 5.97 F/cm2 at a current density of 20 mA/cm2 and energy density of 0.406 mWh/cm2 at a power density of 7 mW/cm2. Moreover, the NbP-W-6 sample exhibited outstanding long-term cycling stability, retaining 84.63 % of its total capacitance throughout 12,000 consecutive cycles. The remarkable energy storage capacity of the NbP-W-6 is attributed to its enhanced diffusion rate, higher charge transfer efficiency, and improved carrier mobility facilitated by the core-shell structure that combines the stability of NbPO5 with the high conductivity of WO3. The assembled asymmetric pouch-type supercapacitor device (APSD) achieves an areal capacitance of 759.0 mF/cm2 at a current density of 30 mA/cm2. Through highly competitive electrochemical performance, our findings reveal that core-shell nanocomposites deposited directly onto Ni-foam, opening up potential applications in energy storage.

Original languageEnglish
Article number105639
JournalSurfaces and Interfaces
Volume56
DOIs
StatePublished - 1 Jan 2025

Keywords

  • Asymmetric pouch-type supercapacitor device
  • Charge storage kinetics
  • Core-shell nanocomposites
  • Hydrothermal and electrodeposition
  • Tungsten oxide decoration on niobium phosphate

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