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Fig. 4. (a) DOS of pristine M-Co3O4 and defective M-Co3O4–x (with oxygen vacancies). (b) The differential charge density of M-Co3O4 and M-Co3O4–x. (c) Calculated structures and OH– adsorption energies (ΔEad) of M-Co3O4 (311) and M-Co3O4–x (with oxygen vacancies) (311) surfaces.