A generalized electrode mechanism unifying classical electrochemical pathways in square-wave voltammetry.

Area of Science:

• Electrochemistry
• Chemical Kinetics
• Theoretical Chemistry

Background:

• Complex electrochemical systems often involve multiple electron transfers and chemical reactions.
• Existing models can be limiting, failing to capture the full mechanistic landscape.
• A unified framework is needed for systematic analysis of diverse electrochemical pathways.

Purpose of the Study:

• To introduce and theoretically treat the comprehensive ECrevEC' electrochemical mechanism.
• To demonstrate how ECrevEC' unifies several classical electrochemical mechanisms.
• To provide a tool for interpreting complex voltammetric data.

Main Methods:

• Theoretical analysis of the ECrevEC' reaction scheme.
• Mathematical modeling to understand coupled kinetics and equilibria.
• Voltammetric simulations to identify diagnostic features.

Main Results:

• The ECrevEC' mechanism encompasses E, ECrev, CErev, EC', EE, ECrevE, and EEC' mechanisms as limiting cases.
• Voltammetric simulations reveal distinct features for mechanistic differentiation.
• The model provides insights into the interplay of electron transfer, chemical equilibrium, and regeneration.

Conclusions:

• The ECrevEC' framework offers a unified approach to complex electrochemical reaction schemes.
• It is a valuable tool for interpreting experimental data in electrocatalysis, bioelectrochemistry, and energy conversion.
• This unified mechanism simplifies the exploration of electrochemical mechanistic landscapes.