Interacting Carbon Nitride and Titanium Carbide Nanosheets for High-Performance Oxygen Evolution

Free‐standing flexible films, constructed from two‐dimensional graphitic carbon nitride and titanium carbide (with MXene phase) nanosheets, display outstanding activity and stability in catalyzing the oxygen‐evolution reaction in alkaline aqueous system, which originates from the Ti–Nx motifs acting as electroactive sites, and the hierarchically porous structure with highly hydrophilic surface. With this excellent electrocatalytic ability, comparable to that of the state‐of‐the‐art precious‐/transition‐metal catalysts and superior to that of most free‐standing films reported to date, they are directly used as efficient cathodes in rechargeable zinc–air batteries. Our findings reveal that the rational interaction between different two‐dimensional materials can remarkably promote the oxygen electrochemistry, thus boosting the entire clean energy system. A fascinating catalyst structure: Free‐standing flexible films composed of strongly coupled carbon nitride and titanium carbide nanosheets through Ti–Nx interactions (see picture) exhibited outstanding electrocatalytic activity and stability towards the oxygen‐evolution reaction (OER). The films could be directly used as efficient cathodes in rechargeable Zn–air batteries.