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Recently, in a paper published in the journal NANO, a group of researchers from China University of Mining and Technology produced an asymmetric supercapacitor (ASC) based on FeCo-selenide nanosheet arrays as positive electrodes and Fe2O3 nanorod arrays as negative electrodes . There is evidence that FeCo-selenide may be a promising electrode material for the next generation in energy storage devices.
Supercapacitors are considered to be the most attractive candidates for energy storage devices and are widely used in portable electronic devices and electric vehicles. They have high power density, fast charge / discharge rate, low maintenance cost and long cycle life.
Similar to transition metal bimetal oxides and sulfides, metal selenides can be considered as promising candidates for electrode materials because selenium belongs to the same group of elements. A group of researchers from China University of Mining and Technology successfully fabricated a solid-state energy storage device based on FeCo-selenide as a positive electrode and Fe2O3 as a negative electrode.
Their report was published in the NANO journal. Using Ni foam as the base material and current collector, FeCo-selenide was synthesized by a two-step hydrothermal method. The FeCo-selenide nanosheet array prepared on Ni foam showed a specific capacity of 978 F / g (163 mAh / g) obtained at a current density of 1 A / g, and a cycle stability of 81.2% after 5000 cycles. The maximum energy density of an ASC device with an operating voltage of 1.6 V at a power density of 759.6 W / kg is 34.6 Wh / kg, which is higher than many other ASCs previously reported.
They discussed the practical application of ASC equipment through the following methods. Assemble several capacitors into a series circuit to light up 1 LED bulb and lamp board of CUMT. The ASC device exhibits excellent electrochemical performance, which indicates that FeCo-selenide may become a promising electrode material for the next generation in energy storage devices.
The team at China University of Mining and Technology is currently exploring solutions to better control high-voltage output. Create high-performance ASC. In order to obtain the best electrochemical performance and reduce costs, the team also hopes to explore devices based on selenide composites in its applications.
(Originally from: Daily Solar)
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