A mesoporous MnCo O electrode material is made for bifunctional oxygen electrocatalysis. The MnCo O exhibits both Co O -like activity for oxygen evolution reaction (OER) and Mn O -like performance for oxygen reduction reaction (ORR). The potential difference between the ORR and OER of MnCo O is as low as 0.83 V. By XANES and XPS investigation, the notable activity results from the preferred Mn - and Co -rich surface. The electrode material can be obtained on large-scale with the precise chemical control of the components at relatively low temperature. The surface state engineering may open a new avenue to optimize the electrocatalysis performance of electrode materials. The prominent bifunctional activity shows that MnCo O could be used in metal-air batteries and/or other energy devices.

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A sandwich shelled hollow TiO2@Co3O4@Co3O4/C composite is synthesized by consecutive coating of Co3O4 nanosheets and TiO2 particles on Co3O4/C hollow spheres.