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Small structures: ultra high potential window water system supercapacitors over 2.0 V

wallpapers Cruise 2020-10-29
In order to meet the growing global energy dem

electrochemical energy storage device with high efficiency renewable has been widely concerned. Supercapacitors show a good application prospect because of their ultra-high power density excellent electrochemical cycle stability. Among them water supercapacitors st out because of their advantages in cost safety conductivity become a new research hotspot. However limited by the thermodynamic electrolysis of water the low electrochemical stability window (1.23 V) of aqueous electrolyte limits the higher energy density of aqueous supercapacitors. In recent years with the optimization of electrode electrolyte materials by researchers many water supercapacitors have broken through the theoretical potential window of 1.23 V many even achieved the results of ultra-high potential window of more than 2.0 V showing the great potential of water supercapacitors in the market of electrochemical energy storage devices. At the same time there is still a lack of a comprehensive review of these papers (> 0.2 V).

Ma Tianyi scientific research team of Clean Energy Chemistry Research Institute of Liaoning University published a review article entitled "ultra high potential window water system super capacitor over 2.0 V" (DOI: 10.1002 / SSTR. 202000020) on small structures through comprehensive investigation analysis summary of research achievements in this field. On the basis of summarizing the theory of super capacitor potential window the mechanism of super capacitor potential window is analyzed. These methods can be divided into structural engineering electrode metal cation doped electrode advanced composite electrode salt in water electrolyte new mixed electrolyte according to the different design of electrode materials electrolyte materials. The researchers discussed the theoretical mechanism of the above methods to improve the potential window analyzed the advantages disadvantages of different methods in detail gave reasonable suggestions predictions for the future development of ultra-high potential window water system supercapacitor. The researchers believe that the combination of the above different advanced strategies will become a new trend in the research development of ultra-high potential window water supercapacitors. At the same time with the integration of different strategies the improvement of their defects water supercapacitors will be applied in large scale thus replacing the organic supercapacitors applied in the current market. This review will also provide a more comprehensive reference for the exploration research of high energy density water supercapacitors with stable output.

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