Efficient fixation of CO_2 at mild conditions by a Cr-conjugated microporous polymer

We reported a bifunctional material, Cr-salen implanted conjugated microporous polymer(Cr-CMP), which is able to capture excellent CO2amounts and has a remarkable catalytic activity towards the cycloaddition reaction of CO2to epoxides forming cyclic carbonates at mild conditions without additional solvents. This heterogeneous Cr-CMP catalyst has a superior catalytic activity to its related homogeneous catalyst and can be reused more than ten times without a significant decrease in catalytic activity.

Influence of Flexoelectric Effect on Director Alignment of Nematic Liquid Crystals in Axial Arrangement Cylindrical Cells

A positive nematic liquid crystal(5CB)sample is confined in cylindrical cells under strong or weak axial anchoring boundary conditions when a radial nonuniform low-frequency electric field is applied and the flexoelectric effect is taken into account.Based on the Frank elastic free energy,the surface energy of the Rapini-Papoular approximation,the polarization free energy and the flexoelectric free energy caused by electric field,we obtain the free energy density of the nematic and solve the corresponding Euler-Lagrange equation numerically.We investigate the director distribution,the critical voltage and the critical exponent of nematic liquid crystal in cylindrical cells.It follows that the critical exponent is the classical one.It is also shown that the critical voltage in the system is affected by the flexoelectric effect,the geometric effect and radial weak anchoring effect on the cylindrical surfaces.A new type of director transition caused by the flexoelectric effect,the dielectric coupling effect and the radial weak anchoring effect is found.

Regioselective cation exchange reaction for photoelectrochemical water splitting

Engineering copper sulfide-based heterostructures via cation exchange(CE)is an appealing approach,as it allows selective combination of distinct compositions and functions of metal sulfides.These heterostructures can play a significant role in photoelectrochemical applications,but the effect of the ratio between two or more domains in such heterostructures on the photoresponse has not been well explored.

Vertically aligned W(Mo)S_(2)/N-W(Mo)C-based light-assisted electrocatalysis for hydrogen evolution in acidic solutions

The development of non-noble-metal hydrogen evolution electrocatalysts holds great promises for a sustainable energy system.Here,a hybrid W(Mo)S_(2)/NW(Mo)C nanosheet with array structures was reported for an efficient light-as sis ted hydrogen evolution electrocatalysts in acidic solutions.The resulting vertically aligned W(Mo)S_(2)/N-W(Mo)C was supported on a conductive carbon fiber paper,which can be produced through annealing W(Mo)S_(2)nanosheets by simultaneous carbonization and N-doping in Ar/H_(2)atmosphere.This optimized WS_(2)/NWC and MoS_(2)/N-MoC electrode exhibits remarkable lightassisted electrocatalysis activity with overpotentials of0.120 and 0.122 V at 10 mA·cm^(-1)in acidic solutions,respectively.Such high hydrogen evolution activities should be attributed to the electrocatalytic synergistic effects of the abundant active sites existing in different phase boundaries and the absorption for ultraviolet-visible light.This study shows that synthesis of low-cost and highly active W(Mo)S_(2)-based hydrogen evolution electrocatalyst opens up a route toward the development of scalable production of hydrogen fuels.