Selective high-temperature CO 2 electrolysis enabled by oxidized carbon 1 intermediates 2 3

3 Theis L. Skafte, Zixuan Guan, Michael L. Machala, Chirranjeevi B. Gopal, Matteo Monti, 4 Lev Martinez, Eugen Stamate, Simone Sanna, Jose A. Garrido Torres, Ethan J. Crumlin, Max 5 García-Melchor, Michal Bajdich , William C. Chueh * and Christopher Graves * 6 7 Department of Energy Conversion and Storage, Technical University of Denmark, Risø campus, 8 Frederiksborgvej 399, 4000 Roskilde, Denmark. 9 Department of Materials Science and Engineering, Stanford University, 496 Lomita Mall, 10 Stanford, CA 94305, USA. 11 SUNCAT Center for Interface Science and Catalysis, SLAC National Accelerator Laboratory, 12 2575 Sand Hill Road, Menlo Park, CA 94025, USA. 13 Department of Applied Physics, Stanford University, 348 Via Pueblo Mall, Stanford, CA 94305, 14 USA. 15 Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 16 94720, USA. 17 Haldor Topsoe A/S, Haldor Topsøes Allé 1, 2800 Kgs. Lyngby, Denmark. 18 School of Chemistry, CRANN and AMBER Research Centres, Trinity College, College Green, 19 Dublin 2, Ireland. 20 Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 21 2575 Sand Hill Road, Menlo Park, CA 94025, USA. 22