Fabrication process of the Au-doped MnO2 electrodes. b,c) STEM images of the Au-doped MnO2. The inset of (c) indicates the intensity difference between Au-occupied columns and undoped MnO atomic columns.
A simple approach to synthesize novel environmentally friendly manganese dioxide ink by using glucose has been developed by a group of scientists. The MnO2 ink could be used for the production of light, thin, flexible and high performance energy storage devices via ordinary printing or even home-used printers. The capacity of the MnO2 ink supercapacitor is more than 30X higher than that of a commercial capacitor of the same weight of active material (e.g. carbon powder), demonstrating the great potential of MnO2 ink in significantly enhancing the performances of energy storage devices, whereas its production cost amounts to less than HK$1.
MnO2 is a kind of environmentally-friendly material and it is degradable. Given the environmental compatibility and high potential capacity of MnO2, it has always been regarded as an ideal candidate for the electrode materials of energy storage devices. The PolyU research team has developed a simple approach to synthesize aqueous MnO2 ink.
1. Highly crystalline carbon particles were prepared by microwave hydrothermal method, followed by a morphology transmission mechanism at room temperature. The MnO2 ink can be coated on various substrates, such as conductive paper, plastic and glass. Its thickness and weight can also be controlled for the production of light, thin, transparent and flexible energy storage devices. Substrates coated by MnO2 ink can easily be erased if required, facilitating the fabrication of electronic devices.
First principles calculation of Au-doped MnO2. a) Differential charge densities of the Au-substituted MnO2 and b) the Au-interstitial MnO2. Green color indicates the loss of electrons whereas pink shows the gain of electrons.
PolyU researchers coated the MnO2 ink on conductive A4 paper and fabricated a capacitive energy storage device with maximum energy density and power density amounting to 4 mWh* cm-3 and 13 W* cm-3 respectively. The capacity of the MnO2 ink capacitor is more than 30X higher than that of a commercial capacitor of the same weight of active material (e.g. carbon powder), demonstrating the great potential of MnO2 ink in significantly enhancing the performances of energy storage devices.
APPS: Wearable devices and radio-frequency identification systems, the MnO2 ink supercapacitor could be used as the power sources for the flexible and “bendable” display panels, smart textile, smart checkout tags, sensors, luggage tracking tags, etc., thereby contributing to the further development of these two areas.
They team will focus on increasing the voltage, optimizing the structure and synthesis process of the device. In addition, further tests will be conducted to integrate the MnO2 ink energy storage device with other energy collection systems. http://www.polyu.edu.hk/web/en/media/media_releases/index_id_6145.html
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