Nanostructured Mn-doped CeO2 thin films with enhanced electrochemical properties for pseudocapacitive applications
Date
2021-06Author
Nwachukwu, Iheke Micheal
Nwanya, Assumpta Chinwe
Osuji, Rose
Metadata
Show full item recordAbstract
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.