Figure 6: Possible near-surface structures on crystalline Co3O4 core under electrochemical conditions. | Nature Communications

Figure 6: Possible near-surface structures on crystalline Co3O4 core under electrochemical conditions.

From: Reversible amorphization and the catalytically active state of crystalline Co3O4 during oxygen evolution

Figure 6

At potentials below Co redox features (a), Co3O4 is in a healed state at which defects in the near-surface are oxidized. At elevated O2 evolution (b), the CoOx(OH)y grows into the crystalline Co3O4 core leading to a reversible amorphization of a sub-nanometre shell. This amorphous CoOx(OH)y shell consists of di-μ-oxo-bridged Co3+/4+ ions with arbitrary site occupancy in the ideal cubic close-packed O2− lattice. Hydrogen atoms and phosphates are not shown.

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