BNL-113651-2017-JA Si Luo, Laura Barrio, Thuy-Duong Nguyen-Phan, Dimitriy Vovchok, Aaron C. Johnston-Peck, Wenqian Xu, Eric A. Stach, and José A. Rodriguez, and Sanjaya D. Senanayake Submitted to JPCC March 2017 Chemistry Department Brookhaven National Laboratory U.S. Department of Energy USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22) Notice: This manuscript has been authored by employees of Brookhaven Science Associates, LLC under Contract No. DE- SC0012704 with the U.S. Department of Energy. The publisher by accepting the manuscript for publication acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. Importance of Low Dimensional CeOx Nanostructures in Pt/CeOx-TiO2 Catalysts for the Water-Gas Shift Reaction