Ndoped hard/soft double-carbon-coated Na 3 V 2 (PO 4 ) 3 hybrid-porous microspheres with pseudocapacitive behaviour for ultrahigh power sodium-ion batteries, Electrochimica Acta (2020), doi:

To develop battery-supercapacitor hybrid devices with high energy and power densities, we propose a rational design of a quaternary hybrid superstructure by using a high-energy biotemplate. This new superstructure is composed of stable fullerene C 60 nanocages, electroactive Na 4 FeO 3 , high-energy Li 3 V 2 (PO 4) 3 and soft carbon as well as tubular ordered mesoporous channels. This design takes advantage of the unique properties of each component, resulting in nanocomposites with synergistic effects to improve the charge transfer and energy storage. We found that this quaternary hybrid electrode has both high energy and power densities as well as a long cycling life in a Li/Na mixedion electrolyte, outperforming a multitude of other battery-supercapacitor hybrid devices reported thus far. The charge storage mechanisms of this hybrid superstructure are proposed for optimizing the electrode design.

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Oxyfl uoride glasses were developed with composition 60GeO 2 •10AlF 3 •25BaF 2 •(1.95-x) GdF 3 • 3YbF 3 •0.05TmF 3 •xErF 3 (x = 0.02, 0.05, 0.08, 0.11, 0.14, 0.17) in mole percent. Intense blue (476 nm), green (524 and 546 nm) and red (658 nm) emissions which identifi ed from the 1 G 4 → 3 H 6 transition of Tm 3+ and the ( 2 H 11/2 , 4 S 3/2 ) → 4 I 15/2 , 4 F 9/2 → 4 I 15/2 transitions of Er 3+ , respectively, were simultaneously observed under 980 nm excitation at room temperature. The results show that multicolor luminescence including white light can be adjustably tuned by changing doping concentrations of Er 3+ ion or the excitation power. In addition, the energy transfer processes among Tm 3+ , Er 3+ and Yb 3+ ions, and up-conversion mechanisms are discussed.

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