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Aqueous Manganese Dioxide Ink for Paper‐Based Capacitive Energy Storage Devices
Author(s) -
Qian Jiasheng,
Jin Huanyu,
Chen Bolei,
Lin Mei,
Lu Wei,
Tang Wing Man,
Xiong Wei,
Chan Lai Wa Helen,
Lau Shu Ping,
Yuan Jikang
Publication year - 2015
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201501261
Subject(s) - capacitance , materials science , inkwell , supercapacitor , capacitive sensing , energy storage , electrode , capacitor , chemical engineering , aqueous solution , nanotechnology , thin film , power density , optoelectronics , composite material , electrical engineering , chemistry , power (physics) , organic chemistry , physics , quantum mechanics , voltage , engineering
We report a simple approach based on a chemical reduction method to synthesize aqueous inorganic ink comprised of hexagonal MnO 2 nanosheets. The MnO 2 ink exhibits long‐term stability and continuous thin films can be formed on various substrates without using any binder. To obtain a flexible electrode for capacitive energy storage, the MnO 2 ink was printed onto commercially available A4 paper pretreated with multiwalled carbon nanotubes. The electrode exhibited a maximum specific capacitance of 1035 F g −1 (91.7 mF cm −2 ). Paper‐based symmetric and asymmetric capacitors were assembled, which gave a maximum specific energy density of 25.3 Wh kg −1 and a power density of 81 kW kg −1 . The device could maintain a 98.9 % capacitance retention over 10 000 cycles at 4 A g −1 . The MnO 2 ink could be a versatile candidate for large‐scale production of flexible and printable electronic devices for energy storage and conversion.