“Island-bridge”-structured nanofluidic membranes for high-performance aqueous energy conversion and storage

The attainment of carbon neutrality requires the development of aqueous energy conversion and storage devices.However,these devices exhibit limited performance due to the permeability-selectivity trade-off of permselective membranes as core components.Herein,we report the application of a synergistic approach utilizing two-dimensional nanoribbons-entangled nanosheets to rationally balance the permeability and selec-tivity in permselective membranes.The nanoribbons and nanosheets can be self-assembled into a nanoflu-idic membrane with a distinctive“island-bridge”configuration,where the nanosheets serve as isolated islands offering adequate ionic selectivity owing to their high surface charge density,meanwhile bridge-like nanorib-bons with low surface charge density but high aspect ratio remarkably enhance the membrane’s permeability and water stability,as verified by molecular simulations and experimental investigations.Using this approach,we developed a high-performance graphene oxide(GO)nanosheet/GO nanoribbon(GONR)nanofluidic membrane and achieved an ultrahigh power density of 18.1 W m^(-2) in a natural seawater|river water osmotic power generator,along with a high Coulombic efficiency and an extended lifespan in zinc metal batteries.The validity of our island-bridge structural design is also demonstrated for other nanosheet/nanoribbon composite membranes,providing a promising path for developing reliable aqueous energy conversion and storage devices.

Biomolecule capturing and sensing on 2D transition metal dichalcogenide canvas

Since the isolation of graphene in 2004,two-dimensional(2D)materials such as transition metal dichalcogenide(TMD)have attracted numerous interests due to their unique van der Waals structure,atomically thin body,and thickness-dependent properties.In recent years,the applications of TMD in public health have emerged due to their large surface area and high surface sensitivities,as well as their unique electrical,optical,and electrochemical properties.In this review,we focus on state-of-the-art methods to modulate the properties of 2D TMD and their applications in biosensing.Particularly,this review provides methods for designing and modulating 2D TMD via defect engineering and morphology control to achieve multi-functional surfaces for molecule capturing and sensing.Furthermore,we compare the 2D TMD-based biosensors with the traditional sensing systems,deepening our understanding of their action mechanism.Finally,we point out the challenges and opportunities of 2D TMD in this emerging area.