Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 26, Issue 29, Pages 6525-6534Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201904769
Keywords
ionic polyimides; oxygen reduction reaction; porous carbon nanosheets; Zn-air battery
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Funding
- National Key Research and Development Program of China [2017YFE9134000/T7DeltaKI-00039]
- NSFC Excellent Young Scientists Fund [51722304]
- NSFC [51973114, 21720102002, 51811530013, 21406220]
- Shanghai Pujiang Talent Program [18PJ1406100]
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Two-dimensional (2D) porous carbon nanosheets (2DPCs) have attracted great attention for their good porosity and long-distance conductivity. Factors such as templates, precursors, and carbonization-activation methods, directly determine their performance. However, rational design and preparation of porous carbon materials with controlled 2D morphology and heteroatom dopants remains a challenge. Therefore, an ionic polyimide with both sp(2)- and sp(3)-hybridized nitrogen atoms was prepared as a precursor for fabricating N-doped hexagonal porous carbon nanosheets through a hard-template approach. Because of the large surface area and efficient charge-mass transport, the resulting activated 2D porous carbon nanosheets (2DPCs-a) displayed promising electrocatalytic properties for oxygen reduction reaction (ORR) in alkaline and acidic media, such as ultralow half-wave potential (0.83 vs. 0.84 V of Pt/C) and superior limiting current density (5.42 vs. 5.14 mA cm(-2) of Pt/C). As air cathodes in Zn-air batteries, the as-developed 2DPCs-a exhibited long stability and high capacity (up to 614 mA h g(-1)), which are both higher than those of commercial Pt/C. This work provides a convenient method for controllable and scalable 2DPCs fabrication as well as new opportunities to develop high-efficiency electrocatalysts for ORR and Zn-air batteries.
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