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Opportunities and Challenges for In-Situ Characterization of Photocatalysts in Environmental TEM

Photocatalytic water splitting has been considered a promising technology for generating sustainable clean energy. Essentially, photocatalytic materials enable the process of converting and storing solar energy in the form of H2 molecules. It is now recognized that atomic level in-situ observations of catalytic materials are critical for understanding structure-reactivity relationships and deactivation processes such as photocorrosion. For photocatalysts, this requires that the system be observed not only in presence of reactant and product species but also during in-situ light illumination. Here opportunities and challenges associated with building a “photo-reactor” inside an environmental TEM (ETEM) are discussed.