title: Carbon nanotube/manganese oxide ultrathin film electrodes for electrochemical capacitors.
abstract: Multiwall carbon nanotube (MWNT)/manganese oxide (MnO2) nanocomposite ultrathin film electrodes have been created via redox deposition of MnO2 on layer-by-layer (LbL)-assembled MWNT films. We demonstrate that these LbL-assembled MWNT (LbL-MWNT)/MnO2 thin films consist of a uniform coating of nanosized MnO2 on the MWNT network structure using SEM and TEM, which is a promising structure for electrochemical capacitor applications. LbL-MWNT/MnO2 electrodes yield a significantly higher volumetric capacitance of 246 F/cm3 with good capacity retention up to 1000 mV/s due to rapid transport of electrons and ions within the electrodes. The electrodes are generated with two simple aqueous deposition processes: the layer-by-layer assembly of MWNTs followed by redox deposition of MnO2 at ambient conditions, thus providing a straightforward approach to the fabrication of high-power and -energy electrochemical capacitors with precise control of electrode thickness at nanometer scales.
authors.affiliation: Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
authors.forename: Seung Woo
authors.initials: SW
authors.lastname: Lee
authors.forename: Junhyung
authors.initials: J
authors.lastname: Kim
authors.forename: Shuo
authors.initials: S
authors.lastname: Chen
authors.forename: Paula T
authors.initials: PT
authors.lastname: Hammond
authors.forename: Yang
authors.initials: Y
authors.lastname: Shao-Horn