Monitoring interfacial electric fields at a hematite electrode during water oxidation.

ABSTRACT: To understand the mechanisms of water oxidation on materials such as hematite it is important that accurate measurements and models of the interfacial fields at the semiconductor liquid junction are developed. Here we demonstrate how electric field induced second harmonic generation (EFISHG) spectroscopy can be used to monitor the electric field across the space-charge and Helmholtz layers in a hematite electrode during water oxidation. We are able to identify the occurrence of Fermi level pinning at specific applied potentials which lead to a change in the Helmholtz potential. Through combined electrochemical and optical measurements we correlate these to the presence of surface trap states and the accumulation of holes (h⁺) during electrocatalysis. Despite the change in Helmho

SUBMITTER: Saeed KH 

PROVIDER: S-EPMC10034152 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature