Metallic 2D Materials for Electrochemical Applications

M. Chhowalla
Rutgers University,
United States

Keywords: 2D, TMD, electrochemical

Summary:

Over the past few years we have been investigating phase transformation in two-dimensional (2D) transition metal dichalcogenides (TMDs). While substantial amount of effort by the 2D community has been devoted to semiconducting 2D TMDs, we have focused our efforts on the metallic phases of these materials. We have found that the metallic phases of single layer MoS2 and other 2D TMDs are truly remarkable. We have shown that: the metallic phase of MoS2 and WS2 provides some of the best non-precious metal catalysts for the hydrogen evolution reaction; they exhibit outstanding performance as energy storage electrodes for supercapacitors; and they can be used to achieve exceptionally low contact resistance in 2D channel based field effect transistors. Most recently, we have shown that the large charge storage capability in electrodes consisting of metallic 2D nanosheets can be used to achieve high frequency electrochemical actuators with high energy and work densities. These amazing properties demonstrate that ultra-thin metals possess properties that are dramatically different and are of both fundamental and technological significance. I will summarize our work on metallic 2D TMDs.