WSe2 is a stable semiconductor in the group-VI transition metal dichalcogenides, which can be mechanically exfoliated into monolayers for transparent photovoltaic devices. This material is currently used in a wide variety of applications including phtotovoltaics, gas sensing, lithium ion batteries, field effect transistors, spintronics and other applications.
Two-Dimensional tungsten selenide (WSe2) is a promising candidate for a new generation of optoelectronics materials. It has a structure that can absorb light like graphene, allowing it to be used in applications such as photocatalysis and phtotovoltaics.
In the crystalline state, WSe2 adopts a hexagonal crystalline structure similar to molybdenum disulfide (MoS2). Each tungsten atom is covalently bonded to 6 selenium ligands in a triangular prism while each selenium atom is bonded to three tungsten atoms in a pyramidal geometry.
Layers stack together via van der Waals interactions, which can be manipulated to create a wide range of structural properties. This is particularly important for the development of functional nanomaterials that are suitable for electrocatalysis.
Researchers at MIT and Vienna University of Technology in Austria have developed a diode that is made from two tungsten selenides. Unlike most diodes, WSe2 has the ability to change between a p-type and n-type electrode that determines the direction of current flow.
This opens up a new potential for the use of this material in solar energy storage systems. In addition, it can be used to develop an advanced electrocatalytic device for hydrogen evolution reaction.
Inorganic tungsten selenide is an excellent candidate for a next-generation energy storage system due to its high energy density and low cost. It also offers the advantage of being a solid-state electrode, which makes it ideal for high energy density and long cycle life.