Interface engineering of heterogeneous transition metal chalcogenides for electrocatalytic hydrogen evolution.

MoS and MoSe are recognized as promising electrocatalysts for the hydrogen evolution reaction (HER), but the active sites are mainly located on the edge, limiting their electrochemical efficiency. Here we have introduced the 2H-1T' interface structures in MoSSe and MoS-MoSe heterostructures to enhance the HER activity in the basal planes by using the density functional theory (DFT) calculations. The structural stability and electronic properties of different 2H-1T' interface structures are investigated and the HER activities are evaluated by using the H adsorption free energy (Δ ).

Chitosan Hydrogel Delivery System Containing Herbal Compound Functions as a Potential Antineuroinflammatory Agent.

Rhein (4,5-dihydroxyanthraquinone-2-carboxylic acid) is an anthraquinone compound mainly isolated from the herbal medicine rhubarb. It possesses a wide spectrum of pharmacological effects. However, the lack of sustained release properties and the poor bioavailability hinder clinical transformation.

A natural cordycepin/chitosan complex hydrogel with outstanding self-healable and wound healing properties.

The chitosan-based hydrogel dressings have been intensively engaged in wound healing. In respect to the relatively unsatisfied anti-bacterial performance of chitosan, we developed a self-healable cordycepin (abbreviated to CY)/chitosan (abbreviated to CS) hydrogel dressing cross linking by non-covalent bonds (hydrogen bond and electrostatic interaction) for wound healing through one-step 'freeze-thaw' method without adding any cross-linking agent. The as-prepared hybrid hydrogel exhibited excellent biocompatibility, suitable swelling ratio and desired mechanical strength, providing remarkable antimicrobial effect with no side effects in vitro.