Exploring Ni-based alkaline OER catalysts: A comprehensive review of structures, performance, and in situ characterization methods

Abstract

Nickel-based catalysts have emerged as crucial components in alkaline oxygen evolution reactions (OER) due to their exceptional catalytic performance and unique structural properties. However, the understanding of their catalytic mechanisms remains incomplete. This review systematically explores the various types of Ni-based catalysts, including metal-organic frameworks (MOFs), perovskites, and layered double hydroxides (LDHs), while emphasizing their performance metrics. We critically assess the application of advanced in situ characterization techniques, such as in situ Raman spectroscopy and X-ray absorption spectroscopy (XAS), in elucidating the structural evolution and active species during the OER process. By addressing the interplay between catalyst structure and performance, this review aims to provide insights that drive future research efforts toward the optimization of Ni-based catalysts for sustainable hydrogen production. Key areas for potential research advancements are also identified.