Abstract
In this study, the capacitive performance of ultrathin-film manganese oxide (MnO2) electrodes for transparent supercapacitors is investigated. The highest transmittance reported so far, 99.1% at a 550 nm wavelength, is achieved with an areal capacitance of 1.6 mF/cm2. The thickness and resulting optical transparency of the MnO2 films can easily be controlled by changing the concentration of the precursor sols in the sol–gel-derived coating process. The thinnest electrode shows the highest transmittance and specific capacitance of 576 F/g. The relationship between the transmittance, optical conductivity and areal capacitance of the electrodes is also investigated. The largest capacitive figure of merits, FoMc, of 62.7 cm2/F is obtained for the thinnest electrode. Deconvolution of the capacitive elements indicates that the surface capacitive element is dominant for the ultrathin electrodes, whereas the contribution of the diffusion-controlled insertion element grows rapidly as the electrode thickness increases.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
