Nanostructured Mn-doped CeO2 thin films with enhanced electrochemical properties for pseudocapacitive applications
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Date
2021-06
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
Cerium oxides with variable oxidation states, high interfacial charge transfer rate have demonstrated to be a
potential pseudocapacitive material. In this paper, we present the structural and electrochemical properties
of undoped and Mn-doped CeO2synthesized using successive ionic layer adsorption and reaction(SILAR)
method. The structural results as obtained from x-ray diffraction (XRD) confirmed the cubic fluorite
structure of CeO2 which was unaltered despite the doping concentration. However, a tensile strain of ~2.3%
was observed due to ionic radii difference. The topography showed a porous network of nanograins, accounting for strong redox interfacial charge transfer. A specific capacitance of 690 Fg−1 was obtained for
5 wt% Mn-doped CeO2, from cyclic voltammetry curve at a scan rate of 10 mV/s. This value is considerably
higher than what was obtained for the undoped ceria, indicating that doping with Mn improved the
electrochemical performance of the ceria films.
Description
Keywords
Cerium oxide, Manganese, Pseudocapacitors, SILAR
Citation
Nwachukwu, I et al.. (2021). Nanostructured Mn-doped CeO2 Thin films with Enhanced Electrochemical Properties for Pseudocapacitive Applications. Journal of Alloys and Compounds. 886. 161206. 10.1016/j.jallcom.2021.161206