期刊
SMALL METHODS
卷 5, 期 6, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smtd.202100024
关键词
atomically dispersed Mn-N-4 sites; gas-phase migration; oxygen reduction reaction; Zn-air batteries
资金
- National Natural Science Foundation of China [21673064, 51802059, 21905070, 22075062, U1909213]
- China postdoctoral science foundation [2017M621284, 2018M631938, 2018T110307]
- Heilongjiang Postdoctoral Fund [LBH-Z17074, LBH-Z18066]
- Fundamental Research Funds for the Central Universities [HIT. NSRIF. 2019040, 2019041]
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Waterloo Institute for Nanotechnology
- NSERC
- National Research Council Canada
- Canadian Institutes of Health Research
- Province of Saskatchewan
- Western Economic Diversification Canada
- University of Saskatchewan
- University of Waterloo
A novel gas-phase migration strategy has been developed for the synthesis of atomically dispersed Mn and N codoped carbon materials as highly effective ORR catalysts. This unique approach significantly increases the Mn loading and enables homogeneous dispersion of Mn atoms to promote the exposure of Mn-N-x active sites, leading to excellent ORR performance. The gas-phase synthetic methodology offers an appealing and instructive guide for the logical synthesis of atomically dispersed catalysts.
Mn and N codoped carbon materials are proposed as one of the most promising catalysts for the oxygen reduction reaction (ORR) but still confront a lot of challenges to replace Pt. Herein, a novel gas-phase migration strategy is developed for the scale synthesis of atomically dispersed Mn and N codoped carbon materials (g-SA-Mn) as highly effective ORR catalysts. Porous zeolitic imidazolate frameworks serve as the appropriate support for the trapping and anchoring of Mn-containing gaseous species and the synchronous high-temperature pyrolysis process results in the generation of atomically dispersed Mn-N-x active sites. Compared to the traditional liquid phase synthesis method, this unique strategy significantly increases the Mn loading and enables homogeneous dispersion of Mn atoms to promote the exposure of Mn-N-x active sites. The developed g-SA-Mn-900 catalyst exhibits excellent ORR performance in the alkaline media, including a high half-wave potential (0.90 V vs reversible hydrogen electrode), satisfactory durability, and good catalytic selectivity. In the practical application, the Zn-air battery assembled with g-SA-Mn-900 catalysts shows high power density and prominent durability during the discharge process, outperforming the commercial Pt/C benchmark. Such a gas-phase synthetic methodology offers an appealing and instructive guide for the logical synthesis of atomically dispersed catalysts.
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