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Enhancing Specific Capacitance and Cyclic Stability through Incorporation of MnO 2 into Bacterial Nanocellulose/PPy·CuCl 2 Flexible Electrodes
Author(s) -
Dias Gabriella M. V.,
Müller Daliana,
Wesling Bruno N.,
Bernardes Joseane C.,
Hotza Dachamir,
Rambo Carlos R.
Publication year - 2019
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201900328
Subject(s) - polypyrrole , supercapacitor , polymerization , materials science , nanocellulose , conductive polymer , membrane , chemical engineering , oxidizing agent , electrode , interfacial polymerization , polymer , in situ polymerization , manganese , capacitance , polymer chemistry , inorganic chemistry , chemistry , monomer , organic chemistry , composite material , cellulose , biochemistry , engineering , metallurgy
This study reports the polymerization of polypyrrole (PPy) in bacterial nanocellulose (BNC) membranes impregnated with manganese oxide (MnO 2 ). Prior to polymerization, nanosized MnO 2 is synthesized in situ using H 2 SO 4 and KMnO 4 . PPy is then polymerized in situ in the MnO 2 impregnated BNC membranes via chemical oxidation using copper chloride dihydrate (CuCl 2 ·2H 2 O) as the oxidizing agent using two different concentrations of pyrrole (Py): 0.04 and 0.08 mol L −1 with a 1:4 molar ratio of Py/CuCl 2 ·2H 2 O. Assembled symmetric supercapacitor devices exhibit specific capacitances as high as 1073 mF cm −2 (259 F cm −3 ) and a capacitance retention of 99.5% after 1000 cycles, which show that the combination of BNC membranes with a conductive polymer and a metallic oxide can be promising as an electrode for energy storage devices.
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