Abstract
Construction of multiphase nanocomposites is an effective way to develop high performance oxygen reduction catalysts. Herein, Ti3C2 MXene supported CoNC and oxygen vacancy-rich TiO2 (ov-TiO2) composite catalyst (CoNC/TiO2-Ti3C2) is prepared by coordination and polymerization of dopamine and Co2+ on the surface of Ti3C2 nanosheets and subsequent heating treatment. The oxygen vacancies on the surface of TiO2 nanoparticles can stabilize the CoNC catalysts as well as promote the oxygen reduction reaction (ORR) on them. Therefore, CoNC/TiO2-Ti3C2 exhibits good ORR activity and durability, even better than the commercial Pt/C catalyst. In contrast, Ti3C2 supported CoNC catalyst without ov-TiO2 (CoNC/Ti3C2) shows decreased ORR activity, indicating the significance of the synergistic effect of CoNC and ov-TiO2. In a practical application, CoNC/TiO2-Ti3C2 exhibits a large power density (155.3 mW cm−2) and extraordinary long-term rechargeability as the air cathode for Zn-air batteries. This strategy of in-situ growth of cocatalysts on Ti3C2 MXene provides a new way for the preparation of high-performance non-noble metal catalysts.
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