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Transparent flexible supercapacitors (TFSCs) are a tantalizing power supplier for future transparent flexible electronics. However, their energy density is far behind a practical level while maintaining high transparency. We report here a transparent flexible potassium-ion microcapacitor, and its high energy density (15.5 μWh cm −2 ) roots in the battery-supercapacitor hybrid storage mechanism and much enlarged working voltage (3 V), outperforming the state-of-the-art TFSC, which is generally based on an aqueous electrolyte and an asymmetric pseudocapacitive mechanism. From an electrode material perspective, a multidimensional topotactic host composite anode is designed in which the component not only performs energy storage by synchronous and reversible uptake of potassium ions and electrons into its host structure, but also mutually compensates individual weakness in functional and structural aspects, efficiently constructing a three-dimensional potassium-ion diffusion and electron transport system. This conceptual exhibition provides design principles at material and device levels for high-performance TFSCs.

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On the basis of multifrequency solar radio observations made on RATAN-600 radiotelescope with high spatial resolution at nine wavelengI$: in the 2-32-wavelength range is shown that filaments and cavities are well detected on the solar scans at short centimeter wavelengths as the regions of low radio brightness with angular dimensions of 25"---80" in E--W direction. The tendency of decreasing radio sizes for cavities and filaments from 2.0 to 8.0 cm is observed. The coronal hole (CH) is more contrast in the range of 8-32 cm. The radio size of CH in E.-N direction increases from 2' (at 8.2) to 5:O (at 3 I .6 cm). The spectra of the brightness temperature of C H and the quiet Sun are obtained. The brightness temperature ofCH is twice lower than that of the quiet Sun at wavelength of 31.6 cm. It has been shown statistically that the coronal holes (CH) and filament cavities caused geomagnetic disturbances (MIKHAI- LUTZA and GNEVYSHEV 1985).The radio observations of these objects are very important both for the studing of their nature and for forecasting the geoeffective events associated with them.The first results of multifrequency observations of CH and filament cavities made on the RATAN-600 radiotelescope with high spatial resolution have been shown in BOROVIK et al. 1988