Enhanced Electrochemical Performance of Highly Porous CeO 2 -Doped Zr Nanoparticles for Supercapacitor Applications.

Autor: Arularasu MV; Sustainable Energy and Environment Research Unit, Center for Global Health Research, Saveetha Medical College, Saveetha Institute of Medical and Technical Science, Chennai, Tamil Nadu, India., Rajendran TV; Department of Chemistry, SRM Institute of Science and Technology, Chennai, Tamil Nadu, India., Arkook B; Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia., Harb M; Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia., Kaviyarasu K; UNESCO-UNISA Africa Chair in Nanoscience's/Nanotechnology Laboratories, College of Graduate Studies, University of South Africa (UNISA), Pretoria, South Africa.
Jazyk: angličtina
Zdroj: Microscopy research and technique [Microsc Res Tech] 2024 Nov 07. Date of Electronic Publication: 2024 Nov 07.
DOI: 10.1002/jemt.24728
Abstrakt: The aim of this work was to develop an ultrasonic-assisted synthesis method for the fabrication of CeO 2 -doped Zr nanoparticles that would improve the performance of supercapacitor electrodes. This method, which eliminates the need for high-temperature calcination, involves embedding CeO 2 into Zr nanoparticles through 1 hr (CeO 2 -Zr-1) and 2 hrs (CeO 2 -Zr-2) of ultrasonic irradiation, resulting in the formation of nanostructures with significant improvements in their electrochemical properties. Through physicochemical analysis, we observed that the CeO 2 -doped Zr nanoparticles, particularly those treated for 2 hrs (CeO 2 -Zr-2), exhibit superior crystalline phase purity, optimal chemical surface composition, minimal agglomeration with particle sizes below 50 nm, and an impressive average surface area of 178 m 2 /g. Compared to the 1 hr irradiation samples (CeO 2 -Zr-1) and undoped CeO 2 nanoparticles, the (CeO 2 -Zr-2) electrodes demonstrated a remarkable capacitance of 198 Fg -1 at a current density of 1 A/g while maintaining ~94.9% of their capacity after 3750 cycles. This indicates not only good reversibility but also exceptional stability. In (CeO 2 -Zr-2) samples, the nanospherical structure achieved through ultrasonic synthesis is responsible for the enhanced capacitive behavior and stability, along with the synergistic effects caused by Zr doping, which improves the CeO 2 nanoparticle conductivity to a significant extent. Surface areas of the electrodes are larger due to the combination of these two materials, which contribute to their superior performance.
(© 2024 The Author(s). Microscopy Research and Technique published by Wiley Periodicals LLC.)
Databáze: MEDLINE
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