The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
An all solid-state electrochemical capacitor operated in the temperature range of 150–180 °C was fabricated with MnO 2 thin film electrode and CsHSO 4 proton-conductive electrolyte. The sample has a cell structure of Au/MnO 2 /CsHSO 4 /MnO 2 /Au. The electrochemical behavior of the capacitor was characterized by cyclic voltammetry technique. It was found that such electrochemical capacitor exhibited a typical cyclic voltammogram of electrochemical capacitors with the average capacity of 1.30×10 2 F g −1 (at 180 °C) and showed a significant increase of the capacity by elevating the operation temperature. This result can be explained by the enhancement of proton diffusion into the MnO 2 electrode.
Department of Energy Sciences, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta Midori-ku, Yokohama 226-8502, Japan