S1 Supporting Information Design of Active Site at Heterointerface between Brownmillerite Type Oxide Promoter and Fluorite Cubic ZrO 2 in Anode of Intermediate Temperature SOFCs Shigeharu Ito, a,b Toshiyuki Mori, * a Akira Suzuki, a Hiroshi Okubo, a Shunya Yamamoto, c Takaya Sato, b and Fei Ye d,e a Solid Oxide Fuel Cell Materials Design Group, Global Research Center for Environment and Energy based on Nanomaterials Science (GREEN), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan b Department of Creative Engineering, Chemical and Biological course, National Institute of Technology, Tsuruoka College, 104 Sawada, Inoka, Tsuruoka, Yamagata, 997-8511, Japan c Takasaki Advanced Radiation Research Institute, National Institute for Quantum and Radiological Science and Technology (QST), 1233 Watanuki, Takasaki, Gunma 370-1292, Japan d School of Material Science and Engineering, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China