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MnO 2 Thin Films on 3D Scaffold: Microsupercapacitor Electrodes Competing with “Bulk” Carbon Electrodes
Author(s) -
Eustache Etienne,
Douard Camille,
Retoux Richard,
Lethien Christophe,
Brousse Thierry
Publication year - 2015
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201500680
Subject(s) - electrode , materials science , carbon fibers , scaffold , thin film , optoelectronics , nanotechnology , composite material , chemistry , biomedical engineering , composite number , engineering
A simple, binder‐free fabrication of high capacitance electrodes based on manganese dioxide (MnO 2 ) thin films is reported. The 3D structure of these electrodes significantly improves the areal capacitance of the MnO 2 thin films up to 670 mF cm −2 in aqueous electrolyte, which is 4.5 times higher than the best reported capacitance of 3D electrodes thus far. This capacitance is on the same order of magnitude as that of a bulk carbon electrode. Moreover, the 3D MnO 2 ‐based electrode exhibits a stable cycling behavior for more than 15 000 cycles.