Cavalca, Filippo Carlo2; Laursen, Anders Bo3; Wagner, Jakob Birkedal2; Damsgaard, Christian Danvad2; Chorkendorff, Ib3; Hansen, Thomas Willum2
1 Center for Individual Nanoparticle Functionality, Center, Technical University of Denmark2 Center for Electron Nanoscopy, Technical University of Denmark3 Department of Physics, Technical University of Denmark4 Experimental Surface and Nanomaterials Physics, Department of Physics, Technical University of Denmark
Photocatalysts for solar fuel production are subject to intensive investigation as they constitute one viable route for solar energy harvesting. Cuprous oxide (Cu2O) is a working photocatalyst for hydrogen evolution but it photocorrodes upon light illumination in an aqueous environment. Environmental transmission electron microscopy (ETEM) makes it possible to obtain insight into the local structure, composition and reactivity of catalysts in their working environment, which is of fundamental interest for sustainable energy research and is essential for further material optimization. Herein, photoreduction of Cu2O is studied in situ using a dedicated TEM specimen holder for light illumination.