Unraveling the Importance of Surface Hydrogen Diffusion in Photocatalysis by Isotope Probing.
Harnessing solar energy for hydrogen generation has motivated extensive efforts to optimize photocatalysts, yet reported efficiencies remain inadequate due to insufficient mechanistic understanding. Using a well-defined Pt/TiO2(110) photocatalyst, time-resolved mass spectrometry, and isotope probing, we show that surfa...