1. Wolfson Catalysis Centre, Department of Chemistry, University of Oxford, Oxford OX1 3QR, U.K.
2. Department of Materials, University of Oxford, Oxford OX1 3PH, U.K.
3. Diamond Light Source Ltd., Harwell Science and Innovation Campus, Didcot OX11 0DE, U.K.
4. Physical and Computational Sciences Directorate & Institute for Integrated Catalysis, Pacific Northwest National Laboratory, PO Box 999, Richland, Washington 99354, United States