Crystalline MnO2 as possible alternatives to amorphous compounds in electrochemical supercapacitors Author(s): Brousse T (Brousse, Thierry), Toupin M (Toupin, Mathieu), Dugas R (Dugas, Romain), Athouel L (Athouel, Laurence), Crosnier O (Crosnier, Olivier), Belanger D (Belanger, Daniel) Source: JOURNAL OF THE ELECTROCHEMICAL SOCIETY 153 (12): A2171-A2180 2006