Presentation Information
[1C06【若手女性研究者優秀賞2025】]Real-time observation of chemical reactions at surface and solid–liquid interface by wavelength-dispersive soft X-ray absorption spectroscopy
*Kaoruho Sakata1 (1. Institute of Materials Structure Science, High Energy Accelerator Research Organization)
A wavelength-dispersive soft X-ray XAS technique was developed that enables real-time observation with single-shot spectrum acquisition. This method supports operando measurements under near-ambient pressure and external fields. It has also been applied to chemical reactions at the solid–liquid interface during electrode potential sweep, demonstrating its versatility. A dedicated cell was designed for real-time observation at the solid–liquid interface of electrodes used in the oxygen evolution reaction (OER), a key process in water electrolysis. Since OER electrodes are performance bottlenecks, real-time tracking and identification of reaction intermediates are essential for catalyst development. Using this method, representative model OER catalysts CoOx and TiO2 were studied, revealing spectral changes during the reaction under potential sweep, indicative of the possible formation of intermediate species. This technique is applicable to a wide range of analyses involving electrocatalysis and electrochemical reactions at solid–liquid interfaces, enabling real-time observation of reaction products and intermediates.