Monitoring and Modeling the Variation of Electrochemical Current Induced by Dynamic Strain at Gold Surfaces

Abstract

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, , 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 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 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.

A Simple Mechanical Method to Modulate the Electrochemical Electrosorption Processes at Metal Surfaces

“…As an alternative method, the surface strain can be achieved by mechanical strategy. Recent studies about the dynamically mechanical strain indicate that the mechanical method can significantly change the electrocatalytic activity of the electrode material of interest [25,26,27]. However, it is inconvenient in practical applications using the dynamic strain induced by the mechanical stretching.…”

Ultrasound‐Assisted Preparation and Performance Regulation of Electrocatalytic Materials

“…[37][38][39][40][41][42][43][44] Among them, applying mechanical load to the ends of an electrode to induce surface stress, thereby causing lattice changes in the electrode material during electrochemical processes, has been extensively investigated. [45][46][47][48] The coupling effect between strain and electrocatalysis has been confirmed through theoretical models and experimental observations. In addition to strain, magnetic fields have also been widely employed in electrocatalytic reactions due to their environmental friendliness and noncontact nature.…”

Electrocatalyst design for the conversion of energy molecules: electronic state modulation and mass transport regulation

“…71 Density functional theory calculations show that strain changes the electronic structure of metal active sites, and appropriate tensile/compressive strain can further optimize the activity of metal-based catalysts. 72–79…”

“…71 Density functional theory calculations show that strain changes the electronic structure of metal active sites, and appropriate tensile/compressive strain can further optimize the activity of metal-based catalysts. [72][73][74][75][76][77][78][79] Luo et al prepared ultrathin PdMo bimetalenes via a one-pot method. Using molybdenum carbonyl as the metal precursor, the low-temperature pyrolysis of this precursor effectively promotes the formation of ultrathin structures with only 0.88 nm thickness.…”