基于等效电路模型理解机械应变对电催化反应的作用

Understanding mechanical modulation of electrocatalytic reaction with an electrical circuit model

电催化的应变工程被认为是提高材料电催化性能最有效的策略之一.然而,目前还缺乏数学模型来深入理解这些有趣的科学现象.本文基于等效电路理论研究了应变对电极反应中法拉第过程的影响.根据基尔霍夫定律,获得了应变影响电极响应电流的数学表达式,研究了法拉第过程逐渐成为电催化反应的主导作用时,由应变导致的响应电流参数的变化趋势和峰值的变化规律,并深入探索电催化反应中不同因素相互作用的复杂机制.

Strain engineering of electrocatalysts is considered as one of the most efficient strategies to enhance their electrocatalytic performance.However,to date,a mathematical model to further understand these interesting scientific phenomena has not been developed.This study theoretically investigated the effect of mechanical strain on the Faradaic process of an electrode reaction based on an equivalent electrical circuit(EEC)at the solid-liquid interface.A mathematical expression for the strain-induced current was obtained using Kirchhoff’s law as follows:we analyzed the dependence of strain-induced electrocatalysis on different elements in the EEC and determined a method to separate the reaction rate of electrocatalysis from other electrochemical processes based on different responses to strain frequencies.