Session: Advances in Electrochemistry:

Two-dimensional transition metal dichalcogenides (2D-TMDCs) offer a new generation of active material for a variety of electrochemical applications, such as hydrogen evolution. However, the 2D configuration of the material distorts the electronic properties compared to bulk counterpart, as well as being highly heterogeneous with terraces, edges, and different layer-thickness all contributing to the electrochemical performance.

In this poster the influence of the layer thickness (monolayer, bilayer and trilayer) of 2D MoS₂, MoSe₂, WS₂, WSe₂ on the reduction of a simple outer sphere redox couple will be reported. We use a scanning electrochemical cell microscopy (SECCM) approach to conduct localized electrochemical measurements on pristine surface of 2D TMDCs. We determine the rate of electron transport for each layer thickness, and suggest a tunneling barrier model, which includes Gold/TMDCs and TMDCs/electrolyte interface effects, to explain the kinetic variations we observe.

Kim McKelvey

Appearances