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Multistaged discharge constructing heterostructure with enhanced solid-solution behavior for long-life lithium-oxygen batteries.
Inferior charge transport in insulating and bulk discharge products is one of the main factors resulting in poor cycling stability of lithium-oxygen batteries with high overpotential and large capacity decay. Here we report a two-step oxygen reduction approach by pre-depositing a potassium carbonate layer on the cathode surface in a potassium-oxygen battery to direct the growth of defective film-like discharge products in the successive cycling of lithium-oxygen batteries. The formation of defective film with improved charge transport and large contact area with a catalyst plays a critical role in the facile decomposition of discharge products and the sustained stability of the battery. Multistaged discharge constructing lithium peroxide-based heterostructure with band discontinuities and a relatively low lithium diffusion barrier may be responsible for the growth of defective film-like discharge products. This strategy offers a promising route for future development of cathode catalysts that can be used to extend the cycling life of lithium-oxygen batteries
Effects of Ox-LDL on Macrophages NAD(P)H Autofluorescence Changes by Two-photon Microscopy
Ox-LDL uptakes by macrophage play a critical role in the happening of
atherosclerosis. Because of its low damage on observed cells and better
signal-to- background ratio, two-photon excitation fluorescence microscopy is
used to observe NAD(P)H autofluorescence of macrophage under difference
cultured conditions- bare cover glass, coated with fibronectin or
poly-D-lysine. The results show that the optimal condition is fibronectin
coated surface, on which, macrophages profile can be clearly identified on
NAD(P)H autofluorescence images collected by two-photon microscopy. Moreover,
different morphology and intensities of autofluorescence under different
conditions were observed as well. In the future, effects of ox-LDL on
macrophages will be investigated by purposed system to research etiology of
atherosclerosis.Comment: Submitted on behalf of TIMA Editions
(http://irevues.inist.fr/tima-editions
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