The oxidation of CO to CO2 on rutile TiO2 is a model reaction in heterogeneous catalysis, but the effect of substrate-specific oxygen activation timescales remains underexplored. Here, the authors monitor the reaction through time-resolved photoelectron spectroscopy at a free-electron laser and propose an O2-TiO2 charge transfer complex responsible for initiating the oxygen activation pathway for CO oxidation on rutile, showing that despite anatase being the more active photocatalyst, oxidation dynamics on rutile are faster.
- Helena Gleissner
- Michael Wagstaffe
- Andreas Stierle