Three Dimensional Macroporous Oxygen‐Deficient TiO2‐x Supported N, P, Co‐tridoped Carbon as Efficient Oxygen Reduction Electrocatalyst. Issue 1 (9th November 2021)

• Record Type: Journal Article
• Authors: Yu, Hang; Zhao, Ximeng; Wu, Feichao; Luo, Yuhong; Jia, Aizhong; Wang, Yanji; Li, Jingde
• Is Part Of: ChemCatChem. Volume 14:Issue 1(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-11-09
• Subjects: Oxygen reduction reaction -- Heteroatom-doping -- Three-dimensional ordered macroporous structure -- Titanium dioxide -- Zinc-air battery; Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.202101311
• Languages: English
• ISSNs: 1867-3880

Abstract

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 TiO2 framework embedded with N, P and Co‐tridoped carbon (3DOM Co/NPC@TiO2‐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 O2 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. Abstract : Electrocatalysis : This work is about the development of the 3DOM Co/NPC@TiO2‐x ORR electrocatalyst. The unique TiO2‐x ‐based 3DOM structure and the synergistic between N, P co‐doping and Co‐decoration contribute to improve the ORR catalytic activity and stability. The proposed electrocatalyst exhibits an outstanding half‐wave potential of 0.86 V in alkaline electrolyte. The resulting primary and flexible zinc‐air batteries also deliver considerable performance.