Three Dimensional Macroporous Oxygen‐Deficient TiO2‐x Supported N, P, Co‐tridoped Carbon as Efficient Oxygen Reduction Electrocatalyst

Abstract Developing efficient and durable electrocatalysts of oxygen reduction reaction (ORR) is critical for high‐performance air cathodes. Herein, a novel three‐dimensionally ordered macroporous oxygen‐deficient TiO 2 framework embedded with N, P and Co‐tridoped carbon (3DOM Co/NPC@TiO 2‐x ) is elaborately designed for ORR. This unique structure offers a high surface area, good mass transfer, excellent electronic conductivity, and stability. Moreover, the experimental and theoretical studies reveal that the synergistic effect of N, P co‐doping and Co‐decoration is indispensable to promote the ORR performance, yielding high O 2 adsorption energy and lowering the reaction barriers simultaneously. Accordingly, the ORR catalytic activity and stability of the proposed electrocatalyst are better than Pt/C in alkaline media. The resulting primary zinc‐air battery delivers a high open‐circuit voltage (1.50 V) and specific capacity (820 Wh kg −1 ) at 20 mA cm −2 . This strategy, combining macroporous oxygen‐deficient oxide support with binary heteroatom doping, provides a new perspective for exploiting efficacious ORR electrocatalysts.