Enhancing the oxygen evolution reaction by tuning the electrode–electrolyte interface in nickel-based electrocatalysts
Ben Wang, Tomohiro Fukushima, Hiro Minamimoto, Andrey Lyalin, Kei Murakoshi, Tetsuya Taketsugu
Abstract
A comprehensive understanding of the electrode-electrolyte interface in energy conversion systems remains challenging due to the complex and multifaceted nature of interfacial processes. This complexity hinders the development of more efficient electrocatalysts. In this work, we propose a hybrid approach to the theoretical description of the OER process on nickel-iron-based oxyhydroxides (γ-Ni1−xFexOOH) electrodes in alkaline media as a model system. Multiple reaction pathways represented by the single- and dual-site mechanisms were investigated by taking into account the realistic structure of the catalyst, the doping, and the solvation effects using a simple and computationally feasible strategy. Accounting for the variable solvation effects considerably affects the predicted overpotential in a roughly linear relationship between overpotential and dielectric constant. By incorporating quantum chemical simulations with kinetic modeling, we demonstrate that tuning the local solvation environment can significantly enhance the OER activity, opening new routine ways for elucidation of the emerging issues of OER processes on transition metal oxide surfaces and design of cost-effective, efficient electrocatalytic systems. Understanding electrode–electrolyte interfacial phenomena is key to developing efficient electrocatalysts. Here, the authors combine quantum chemical simulations with kinetic modeling to describe the oxygen evolution reaction on nickel-iron-based oxyhydroxide (γ-Ni1−xFexOOH) electrodes in alkaline media, showing that the reaction can be enhanced by tuning the local solvation environment.