Iontronic microscopy of a tungsten microelectrode: "seeing" ionic currents under an optical microscope.

ABSTRACT: Optical methods for monitoring electrochemical reactions at an interface are advantageous because of their table-top setup and ease of integration into reactors. Here we apply EDL-modulation microscopy to one of the main components of amperometric measurement devices: a microelectrode. We present experimental measurements of the EDL-modulation contrast from the tip of a tungsten microelectrode at various electrochemical potentials inside a ferrocene-dimethanol Fe(MeOH)₂ solution. Using the combination of the dark-field scattering microscope and the lock-in detection technique, we measure the phase and amplitude of local ion-concentration oscillations in response to an AC potential as the electrode potential is scanned through the redox-activity window of the dissolved species. W

SUBMITTER: Zhang Z 

PROVIDER: S-EPMC10568260 | biostudies-literature | 2023 Oct

REPOSITORIES: biostudies-literature