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Here,Edef1is the system energy with loss of one oxygen atom(O1),Ebulk is the energy of a slab without loss of oxygen atom, Edef2 is the system energy with loss of two oxygen atoms, and EO2is the energy of an O2 molecule in gas phase. The removal energy of thefirst lattice oxygen atom in the OL-1 super cell (EVO1) is 3.51 eV. Interestingly, the removal energy of the second lattice oxygen atom adjacent to the oxygen vacancy
(EVO2= 3.37 eV) is lower thanEVO1. This result suggests that the presence of oxygen vacancy makes the lattice oxygen adjacent to the oxygen vacancy more active.

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