# Promoting Electrochemical Reversibility: Concave versus Convex Electrodes

## TL;DR

This paper explores how the shape of electrodes affects electrochemical reversibility, showing that concave shapes can reduce overpotential and improve performance in sensors and batteries.

## Contribution

The novel contribution is the macroscopic simulation showing that concave electrode shapes reduce overpotential compared to flat or convex shapes.

## Key findings

- Concave electrode surfaces exhibit reduced overpotential compared to flat or convex surfaces.
- Electrode shape is a key factor in controlling electrochemical reversibility at the macroscopic scale.
- Concave designs offer a new approach for enhancing electrocatalytic responses in sensors and battery materials.

## Abstract

The importance of
electrode shape, alongside electrode size, as
key factors in controlling the reversibility or otherwise of electrochemical
responses, is recognized at the microscopic level but is explored
here via finite-element simulation on the macroscopic scale. Reduced
overpotential is seen for concave surfaces relative to flat or convex
surfaces, providing an unexplored avenue for the design and fabrication
of electrodes, including composites for diverse applications where
enhanced reversibility is desirable, such as in sensors and battery
materials where the promotion of electrocatalytic responses is important.