Probing Hidden Mechanisms in Electrocatalysis by Simulating the Dynamic Interfacial Microenvironment

Computational modeling of electrocatalysis has long relied on static representations of the electrode–electrolyte interface and thermodynamic descriptors. While these conventional approaches provide valuable insights, they inherently treat the interfacial environment as rigid and passive, overlooking its dynamic and responsive nature under operational conditions. Yet, the actual electrochemical interface is a complex and dynamic entity, where the solvent, adsorbates, ions and electrode surface engage in a continuous interplay, driven by the applied potential. Capturing this dynamic interfacial microenvironment is therefore essential for a realistic understanding of electrocatalytic mechanisms. In this Perspective, we discuss how explicit simulations of the interfacial microenvironment─particularly through methods like ab initio molecular dynamics that incorporate solvent, ions, and potential effects─enables the direct visualization and analysis of concerted dynamics and transient states that are difficult to intuit or predefine. Such simulations provide an atomic-scale “movie” of the evolving interface, offering critical insights into: (1) the active participation of the solvent network in stabilizing or mediating reaction intermediates, (2) the potential dependence of free energy profiles, and (3) the cooperative role of electrolyte components in electrocatalytic steps. We emphasize that explicit, dynamic simulation of the interfacial microenvironment is essential for capturing the synergistic, potential-driven complexity of real electrochemical interfaces. This not only refines predictions from static models but can sometimes reveal hidden mechanisms, thereby advancing the interpretation of reaction pathways and supporting the rational design of efficient electrocatalysts.