Coupling hollow Fe3O4 nanoparticles with oxygen vacancy on mesoporous carbon as a high-efficiency ORR electrocatalyst for Zn-air battery

[Display omitted] •Well-defined mesoporous carbon was prepared by pyrolyzing in oxygen-deficient condition.•The hollow Fe3O4 nanoparticles with oxygen vacancy were incorporated in mesoporous carbon.•The hybrid materials exhibited a high power density (106 mW cm−2) in Zn-air battery. Designing a low-...

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Bibliographic Details
Published in:Journal of colloid and interface science 2020-05, Vol.567, p.410-418
Main Authors: Deng, Yijie, Tian, Xinlong, Shen, Guohong, Gao, Yang, Lin, Chenxiao, Ling, Liming, Cheng, Faliang, Liao, Shijun, Zhang, Shiguo
Format: Article
Language:English
Subjects:
Fe3O4
Mesoporous carbon
Oxygen reduction catalyst
Oxygen vacancy
Zn-air battery
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Summary:[Display omitted] •Well-defined mesoporous carbon was prepared by pyrolyzing in oxygen-deficient condition.•The hollow Fe3O4 nanoparticles with oxygen vacancy were incorporated in mesoporous carbon.•The hybrid materials exhibited a high power density (106 mW cm−2) in Zn-air battery. Designing a low-cost, high-efficiency and robust doped-carbon-based oxygen reduction reaction electrocatalyst for large-scale implementations of fuel cells is highly desirable but challenging. In this work, we report a new type of hollow Fe3O4 with oxygen vacancy incorporating on mesoporous carbon prepared by pyrolyzing mesoporous carbon enriched with oxygen-containing functional groups, in combination with ferric acetylacetonate. The catalysts possess high specific surface area with predominantly mesoporous architecture and ultrahigh nitrogen content (up to 7.47 wt%). Benefiting from the integration of abundant active nitrogen and Fe-Nx species, and synergistic effect between Fe3O4 nanoparticles cooperated with oxygen vacancy and N-doped carbon, the half-wave potential of the preparing hybrid catalyst is 30 mV more positive than that of the commercial Pt/C catalyst in alkaline medium, and exhibits a high selectivity (4 e− process), and outstanding long-term stability. More importantly, the C-FePPDA-900 catalyst displays a high power density (106 mW cm−2) and specific capacity of 724 mAh gzn−1 when it is used as an air cathode catalyst in a specifically assembling Zn-air cell, superior to those of most reported catalysts.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2020.02.013