Aqueous Manganese Dioxide Ink for Paper‐Based Capacitive Energy Storage Devices |
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| Authors: | Jiasheng Qian Huanyu Jin Dr Bolei Chen Mei Lin Dr Wei Lu Dr Wing Man Tang Dr Wei Xiong Prof Lai Wa Helen Chan Prof Shu Ping Lau Dr Jikang Yuan |
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| Institution: | 1. Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong SAR;2. School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, 693 Xiongchu Road, Wuhan 430073 (P.R. China);3. Shenzhen Research Institute, The Hong Kong Polytechnic University, Shenzhen 518057 (P.R. China) |
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| 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. |
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| Keywords: | electrochemistry energy‐storage devices metal oxides MnO2 ink thin films |
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