Schematic illustration of bulk oxygen spillover in supported metal catalysts. Credit: DICP A team led by Prof. Tao Zhang and Prof. Yanqiang Huang at the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences (CAS), working with Prof. Wei Liu of DICP and Prof. Yanggang Wang of the Southern University of Science and Technology, has directly tracked oxygen movement in catalysts. Using environmental transmission electron microscopy, they observed bulk oxygen spillover in Ru/