Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 25, Issue 22, Pages 5768-5776Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201900306
Keywords
carbon; doping; electrochemistry; oxygen; reduction
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Funding
- National Natural Science Funds of China [51432003, 51802011, 51125007]
- National Key R&D Program of China [2018YFB0105500]
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An ice/salt-assisted strategy has been developed to achieve the green and efficient synthesis of ultrathin two-dimensional (2D) micro/mesoporous carbon nanosheets (CNS) with the dominant active moieties of Fe-N-4 (Fe-N-CNS) as high-performance electrocatalysts for the oxygen reduction reaction (ORR). The strategy involves freeze-drying a mixture of iron porphyrin and KCl salt using ice as template followed by a confined pyrolysis with KCl as an independent sealed nanoreactor to facilitate the formation of 2D carbon nanosheets, N incorporation, and porosity creation. The well-defined assembly of ultrathin 2D carbon nanosheets ensures high utilization of D1 and D3 Fe-N-4 active sites, and effectively promotes the mass transport of ORR reactants by virtue of the pronounced mesoporous structure. The resulting Fe-N-CNS electrocatalyst was shown to exhibit superior ORR activity, better electrochemical durability, and methanol tolerance towards ORR in alkaline electrolyte relative to the commercial Pt/C electrocatalyst.
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