Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 260, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2019.118207
Keywords
Nanohybrids; Co-N-C nanosheets; Co nanoparticles; Synergistic effect; Electrocatalysis; Oxygen reduction reaction
Funding
- National Natural Science Foundation of China [21671106, 11874334, 21471082, 21533012, 21501095]
- China Postdoctoral Science Foundation [2019M651813]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Opening Research Foundations of the State Key Laboratory of Coordination Chemistry, Nanjing National Laboratory of Solid State Microstructures, Nanjing University
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Metal-nitrogen-codoped carbon (M-N-C) nanostructures are promising electrocatalysts for oxygen reduction reaction (ORR). Despite the great progress that has been achieved, synthesizing three-dimensional porous nanoarchitectures derived from Co-N-C nanosheets or related nanohybrids with high content ( > 5 wt%) of exposed single-atom sites remains a challenge. Herein, novel three-dimensional mesoporous Co-N-C nanosheets network enwrapping small amount of Co nanoparticles nanohybrids are fabricated by molten-salt template-assisted pyrolysis of Co-folic acid precursors and chemical etching. In the obtained nanohybrids, the content of single-atom-like Co (SA-Co%) is 7.4 wt% < SA-Co% < 19.4 wt%. Due to the unique mesoporous nanosheets network structure and efficient synergy of atomic and nanoscaled Co species, such nanohybrids manifest enhanced ORR activity with a half-wave potential of 0.85 V, outperforming pure Co-N-C, Pt/C and most of other reported catalysts. Moreover, their stability exceeds that of Pt/C. This work will lead to the optimization of M-N-C nanostructures and accelerate their applications in fuel cells.
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