Real-time imaging of surface chemical reactions by electrochemical photothermal reflectance microscopy.

ABSTRACT: Traditional electrochemical measurements based on either current or potential responses only present the average contribution of an entire electrode's surface. Here, we present an electrochemical photothermal reflectance microscope (EPRM) in which a potential-dependent nonlinear photothermal signal is exploited to map an electrochemical process with sub-micron spatial resolution. By using EPRM, we are able to monitor the photothermal signal of a Pt electrode during the electrochemical reaction at an imaging speed of 0.3 s per frame. The potential-dependent photothermal signal, which is sensitive to the free electron density, clearly revealed the evolution of surface species on the Pt surface. Our results agreed well with the reported spectroelectrochemical techniques under similar conditio

SUBMITTER: Zong C 

PROVIDER: S-EPMC8179047 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature