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- Title
Anchoring Ceria Nanoparticles on Reduced Graphene Oxide and Their Enhanced Photocatalytic and Electrochemical Activity for Environmental Remediation.
- Authors
Khan, M. A. Majeed; Rani, Saruchi; Ansari, Anees A.; Ahamed, Maqusood; Ahmed, Jahangeer; Kumar, Sushil; Rana, Abu ul Hassan S.
- Abstract
Here, we report the synthesis of CeO2 and a reduced graphene oxide (rGO)/CeO2 nanocomposite prepared through a facile single-step hydrothermal procedure. Modern measurement techniques, including x-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution (HR)-TEM, scanning electron microscopy (SEM), UV–Vis spectroscopy, photoluminescence (PL) spectroscopy, and photocatalytic and electrochemical measurements, were utilized to analyze the as-obtained CeO2 nanoparticles (NPs) and rGO/CeO2 nanocomposite. XRD patterns for the synthesized CeO2 and rGO/CeO2 revealed a pure cubic phase of CeO2. Field emission scanning electron microscopy (FE-SEM) images showed nanocrystalline CeO2 NPs almost uniformly anchored on the rGO surface. The results of UV–Vis absorption spectra of the synthesized nanocomposite showed a prominent red shift of the optical absorption edge. The photocatalytic performance of the prepared CeO2 and rGO/CeO2 was examined for rhodamine B (RhB) dye degradation under sunlight irradiation. The rGO/CeO2 nanocomposite demonstrated high photocatalytic activity against RhB dye in 100 min under sunlight irradiation. This enhancement was attributed to the significant suppression of the recombination of photo-generated electron–hole pairs and rapid transport through rGO sheets, and the lower band gap energy of the rGO/CeO2 nanocomposite. The electrochemical characteristics of the prepared CeO2 nanoparticles and rGO/CeO2 nanocomposite were examined by cyclic voltammetry (CV), galvanostatic charge/discharge (GCD), and electrochemical impedance spectroscopy (EIS) techniques. The results indicated that the rGO/CeO2 nanocomposite showed better capacitive behavior than pure CeO2 NPs, possibly owing to the excellent electrical conductivity and substantial specific surface area attributable to rGO. The desirable features attained in the rGO/CeO2 nanocomposite make it suitable for use in applications such as environmental pollution remediation and electrochemical energy storage.
- Publication
Journal of Electronic Materials, 2024, Vol 53, Issue 2, p930
- ISSN
0361-5235
- Publication type
Article
- DOI
10.1007/s11664-023-10837-5