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<p>In this study, Cerium oxide and Cerium oxide/reduced grapheme oxide nanocomposites (CeO<sub>2</sub> and CeO<sub>2</sub>/rGONCs) were synthesized via a hydrothermal route and characterized using Powder X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM), Scanning Electron Microscope (SEM), and Diffuse Reflectance Spectroscopy (DRS) techniques. PXRD confirmed a face-centered cubic (Fm-3&#xa0;m) structure with high crystallinity. TEM analysis showed a (040) lattice fringe width of 0.648&#xa0;nm, closely matching the theoretical value (0.65&#xa0;nm). Optical bandgap were 2.75&#xa0;eV (CeO<sub>2</sub>) and 2.62&#xa0;eV (CeO<sub>2</sub>/rGONCs). Electrochemical measurements revealed specific capacitances of 159.1 Fg<sup>−1</sup> (CeO<sub>2</sub>) and 245.1 Fg<sup>−1</sup> (CeO<sub>2</sub>/rGONCs) at 1 Ag<sup>−1</sup>, with capacitance retention of 90–95% after 2000 cycles. CeO<sub>2</sub>/rGONCs also exhibited effective sensing performance for lead ions, indicating its potential for multifunctional electrochemical applications. The key result of this work is the multifunctional use of the as-synthesised materials, which shows their efficacy for sensors and efficient energy storage, opening the door for sustainable and multipurpose devices.</p> Graphical Abstract <p></p>

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Hydrothermally Synthesized CeO2 and CeO2/rGO Nanocomposites for Enhanced Electrochemical Sensing and Supercapacitor Applications

  • 期刊论文

  • 发表日期：

    2025年7月19日

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  • V. Ramanjaneyulu,
  • T. Bala Narsaiah

摘要

In this study, Cerium oxide and Cerium oxide/reduced grapheme oxide nanocomposites (CeO2 and CeO2/rGONCs) were synthesized via a hydrothermal route and characterized using Powder X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM), Scanning Electron Microscope (SEM), and Diffuse Reflectance Spectroscopy (DRS) techniques. PXRD confirmed a face-centered cubic (Fm-3 m) structure with high crystallinity. TEM analysis showed a (040) lattice fringe width of 0.648 nm, closely matching the theoretical value (0.65 nm). Optical bandgap were 2.75 eV (CeO2) and 2.62 eV (CeO2/rGONCs). Electrochemical measurements revealed specific capacitances of 159.1 Fg−1 (CeO2) and 245.1 Fg−1 (CeO2/rGONCs) at 1 Ag−1, with capacitance retention of 90–95% after 2000 cycles. CeO2/rGONCs also exhibited effective sensing performance for lead ions, indicating its potential for multifunctional electrochemical applications. The key result of this work is the multifunctional use of the as-synthesised materials, which shows their efficacy for sensors and efficient energy storage, opening the door for sustainable and multipurpose devices.

Graphical Abstract