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Zhejiang Provincial Collaborative Innovation Centre of Agricultural Biological Recourses Biochemical Manufacturing[2016KF0008]
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Catalytic Prenylation and Reverse Prenylation of Indoles with Isoprene: Regioselectivity Manipulation through Choice of Metal Hydride
No full textThe basic industrial feedstock isoprene was employed as a building block to install prenyl and reverse-prenyl groups onto indoles. The regioselectivity can be manipulated by the choice of metal hydride. Reverse-prenylated indoles were attained with high selectivity when using Rh-H. By switching to a Pd-H catalyst, selectivity toward prenylated indoles was achieved. This regiodivergent method also features high atom economy without stoichiometric byproduct formation
Candle soot: onion-like carbon, an advanced anode material for a potassium-ion hybrid capacitor
No full textAlthough potassium-ion storage technology has started to receive significant attention, its development is still in its infancy; thus, exploration of suitable electrode materials is critical at this stage. Herein, onion-like carbon (OLC) was obtained from the combustion soot as the candle burnt and used as a promising anode material for potassium-ion storage. This OLC delivered high reversible capacity and exhibited good rate performance and cycling stability. Taking advantage of these features, a potassium-ion hybrid capacitor (PIHC) with OLC as the battery-type anode and activated carbon as the capacitor-type cathode was constructed. The constructed device displayed the high energy density of 142W h kg(-1), the ultrahigh power output of 21 kW kg(-1), and a long cycling life (83% capacity retention after 6000 cycles). Thus, this device may simultaneously cater to the requirements of high power and high energy densities in a wide range of applications
Sequential growth of hierarchical N-doped carbon-MoS2 nanocomposites with variable nanostructures
No full textTo develop high performance nanocomposites with potential commercialization value, general synthesis strategies that could provide nanocomposites with finely tunable nanostructures and physicochemical properties are desirable. In this work, a universal approach was developed that fulfilled these requirements for the sequential growth of nitrogen-doped carbon-molybdenum disulfide (denoted as NC-MoS2) nanocomposites with versatile nanostructures, namely, dual-shell, yolk-shell, core-shell, hollow spheres and nanorods. The formation mechanism of the different nanostructures is proposed to arise from the synergistic effect of dual surfactants, the complexing effect between amine groups and Mo species, hydrogen bonding interactions among aminophenol resols, cysteine and sodium molybdate dihydrate (Na2MoO4 center dot 2H(2)O), and the sequential formation of Mo-resol clusters. The NC-MoS2 hollow spheres displayed higher lithium-ion storage capacity than the N-free hollow sample, NC-MoS2 dual-shell and yolk-shell spheres, and may benefit from the strengthened charge transfer rate originating from the N-doping, higher N-content and hollow nanostructures
