Presentation Information
[3F05]Operando XAS observation of all elements in water electrolysis catalysts using hard, tender, and soft X-rays
*masaaki yoshida1 (1. Yamaguchi University)
Hydrogen production via water electrolysis using renewable energy has attracted increasing attention as a clean energy technology. While the hydrogen evolution reaction (HER) is relatively facile, the oxygen evolution reaction (OER) requires efficient electrocatalysts due to its sluggish kinetics. Recently, various transition metal-based catalysts, such as electrodeposited nickel carbonate and cobalt phosphate, have been developed for near-neutral pH electrolytes. However, the role of electrolyte-derived ions remains unclear. In this study, operando X-ray absorption spectroscopy (XAS) was performed using hard, tender, and soft X-rays to observe all relevant elements in water electrolysis catalysts. Measurements were conducted at multiple synchrotron facilities in Japan, including SPring-8, KEK-PF, and UVSOR. The presentation will introduce these multi-energy operando XAS techniques and show representative examples of catalyst behavior in various electrolyte environments.