Oxygen-deficient 3D-ordered multistage porous interfacial catalysts with enhanced water oxidation performance
Constructing the ordered multistage pore structures and controllable defects are accepted as an effective strategy to optimize the activity and stability of the catalysts, but it still restricted by synthesis technology. Herein, an advanced highly-quality 3D-ordered macro-/mesoporous Co3O4/CeO2 heterostructure catalyst (3DOM-Co3O4/CeO2) was developed via combining two kinds of metal oxides with special intrinsic characteristics by a simple strategy. The as-prepared 3DOM-Co3O4/CeO2 shows an ordered multistage interconnected mesoporous channels, which provides sizable electrochemical active area and enriches oxygen vacancies (OVs) concentration at the Co3O4 and CeO2 interface. As expected, the 3DOM-Co3O4/CeO2 with the optimal ratio of Co/Ce (3DOM-CC-10) exhibits satisfactory catalytic activity and remarkable cycling performance when evaluated as an anode material for oxygen evolution reaction (OER). The superior OER performance of 3DOM-CC-10 could be attributed to its structure with high OVs, the synergies effect between two kinds of metal oxides and 3D-ordered multistage porous conductive networks.