An effective strategy for carbon encapsulation was developed to increase the capacitive performance of WO3−x nanowires as a high-energy and stable anode material for flexible asymmetric supercapacitors.

No abstract

No abstract

A heterogeneous catalytic system featuring multifunctional sites has been constructed through the grafting of an amino-functionalized imidazolium ionic liquid (Si-IM-NH 2 ) and a quaternary ammonium salt (Si-TBAI) on mesoporous cagelike silica SBA-16 for the coupling of carbon dioxide (CO 2 ) with epoxides. The resultant composites SBA-16@IM-NH 2 and SBA-16@TBAI, even with much lower Brunauer−Emmett−Teller surface areas than SBA-16, exhibit highly increased CO 2 adsorption capacities (i.e., up to 3.13 mmol•g −1 at 80 °C, 3.5 times that of SBA-16). Under the synergistic effect of the good CO 2 enrichment ability, multiple active sites (I − , Cl − , −NH 2 group, and imidazolium ring), and open mesoporous channels, the catalytic system with a Si-TBAI/ Si-IM-NH 2 molar ratio of 3:1 can catalyze CO 2 into several kinds of cyclic carbonates with excellent yield and selectivity at low temperature and pressure (50 °C and 0.5 MPa) in the absence of any cocatalyst. This catalytic system can be easily recovered and recycled several times without loss of activity, making it a competitive catalyst for CO 2 conversion.

No abstract