Isolation of pseudocapacitive surface processes at monolayer MXene flakes reveals delocalized charging mechanism.

ABSTRACT: Pseudocapacitive charge storage in Ti₃C₂T_x MXenes in acid electrolytes is typically described as involving proton intercalation/deintercalation accompanied by redox switching of the Ti centres and protonation/deprotonation of oxygen functional groups. Here we conduct nanoscale electrochemical measurements in a unique experimental configuration, restricting the electrochemical contact area to a small subregion (0.3 µm²) of a monolayer Ti₃C₂T_x flake. In this unique configuration, proton intercalation into interlayer spaces is not possible, and surface processes are isolated from the bulk processes, characteristic of macroscale electrodes. Analysis of the pseudocapacitive response of differently sized MXene flakes in

SUBMITTER: Brunet Cabre M 

PROVIDER: S-EPMC9870982 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature