Aqueous Manganese Dioxide Ink for Paper‐Based Capacitive Energy Storage Devices1. (20th April 2015) - Qian, Jiasheng
Abstract: We report a simple approach based on a chemical reduction method to synthesize aqueous inorganic ink comprised of hexagonal MnO2 nanosheets. The MnO2 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 MnO2 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 MnO2 ink could be a versatile candidate for large‐scale production of flexible and printable electronic devices for energy storage and conversion.