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Binder-free, graphitic, hierarchically porous carbon nanofiber (CNF) electrodes with in-situ encapsulated Co–Ni catalysts are synthesized with electrospinning as an efficient oxygen electrode for Li–O2 batteries (LOBs). The inherently interconnected, graphitic network makes it unnecessary to include binders and carbon additives, therefore eliminating the possible side reactions from binder and facilitating...
Highly porous, conductive graphene oxide (GO)/carbon nanotube (CNT) composite films are synthesized via facile vacuum filtration of hybrid dispersion. The flexible film is used as interlayer between separator and sulfur cathode to entrap active materials and prevent polysulfide shuttle. The lithium-sulfur (Li–S) battery furnished with an optimal GO/CNT interlayer delivers an excellent reversible capacity...
ZnO-doped carbon quantum dots (CQDs) were prepared by the chemical oxidation of activated carbon followed by zinc acetate impregnation and precipitation. The ZnO-doped CQDs had a stable fluorescence and a high fluorescence quantum yield. The fluorescence of the ZnO-doped CQDs can be quenched by reduction with metronidazole, allowing a flow-injection chemiluminescence method to be used to determine...
Carbon quantum dots (CQDs) are a new fluorescent material with stable fluorescence, low toxicity and many other superior properties that make their applications in biology possible. CQDs in wood charcoal were created by a 5N HNO 3 solution using three different methods, reflux, microwave and ultrasound methods. Factors that determine the fluorescence quantum yield were examined and preparation...
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