Application of X-ray absorption spectroscopy in carbon-supported electrocatalysts

Breakthroughs in energy storage and conversion devices depend heavily on the exploration of low-cost and high-performance materials. Carbon-supported electrocatalysts with dimensional varieties have recently attracted significant attention due to their strong structural flexibility and easy accessibility. Nevertheless, understanding the connection between their electronic, structural properties, and catalytic performance must remain a top priority. Synchrotron radiation (SR) X-ray absorption spectroscopy (XAS) techniques, including hard XAS and soft XAS, are recognized as efficient and comprehensive platforms for probing the surface, interface, and bulk electronic structure of elements of interest in the materials community. In the past decade, the flourishing development of materials science and advanced characterization technologies have led to a deeper understanding at different temporal, longitudinal, and spatial scales. In this review, we briefly describe the concept of XAS techniques and summarize their recent progress in addressing scientific questions on carbon-supported electrocatalysts through the development of advanced instruments and experimental methods. We then discuss the remaining challenges and potential research directions in next-generation materials frontiers, and suggest challenges and perspectives for shedding light on the structure-activity relationship.