Monitoring and modeling the variation of electrochemical current induced by dynamic strain at gold surfaces

Enthalten in
Journal of the Electrochemical Society 
Volume
166
Issue
10
Start Page
H480
End Page
H484
Citation
Journal of the Electrochemical Society 166 (10): H480-H484 (2019)
Publisher DOI
10.1149/2.0081912jes
Scopus ID
2-s2.0-85073431727
Publisher
Electrochemical Society
This study investigates the electrochemical charging and discharging processes at a strained gold surface using dynamic mechanical deformation. The electrocapillary coupling coefficient in our study, Λ, measures the response of the capacitive current to the mechanical elastic strain with a focus on the potential range of the double layer capacitive process of interest. The variation in the magnitude of Λ during the potential scan shows that the impact of surface strain on the capacitive current is strongly dependent on the electrode states. The positive sign of Λ implies that tensile strain can enhance the charging current on the electrode surface, whereas tensile strain has the opposite effect on the discharging current with the potential changing in the negative direction. Moreover, a simple equivalent circuit was used to further characterize the coupling between the capacitive process and mechanical strain at the gold surface for exploring the application in the field of electrochemical energy storage.
DDC Class
530: Physik
600: Technik