Abstract
The self-assembly of block copolymer in solution has proven to be an effective strategy for building up a wide range of nanomaterials with diverse structures and applications. This paper reports a facile self-assembly approach towards two-dimensional (2D) sandwich-like mesoporous nitrogen-doped carbon/reduced graphene oxide nanocomposites (denoted as mNC/rGO) with well-defined large mesopores. The strategy involves the synergistic self-assembly of polystyrene-block-poly(ethylene oxide) (PS-b-PEO) spherical micelles, m-phenylenediamine (mPD) monomers and GO in solution and the subsequent carbonization at 900 °C. The resultant mNC/rGO nanosheets have an average pore size of 19 nm, a high specific surface of 812 m2·g–1 and a nitrogen content of 2.2 wt%. As an oxygen reduction reaction (ORR) catalyst, the unique structural features render the metal-free nanosheets excellent electrocatalytic performance. In a 0.1 mol·L–1 KOH alkaline medium, mNC/rGO exhibits a four-electron transfer pathway with a high half-wave-potential (E1/2) of +0.77 V versus reversible hydrogen electrode (RHE) and a limiting current density (JL) of 5.2 mA·cm–2, which are well comparable with those of the commercial Pt/C catalysts.
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (Nos. 51573091, 21774076, 21320102006 and 91527304), Program of the Shanghai Committee of Science and Technology (Nos. 17JC1403200 and 16JC1400703), and Program for Shanghai Eastern Scholar. The authors also appreciate the Instrumental Analysis Center of Shanghai Jiao Tong University for some measurements.
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Two-dimensional Nitrogen-doped Mesoporous Carbon/Graphene Nanocomposites from the Self-assembly of Block Copolymer Micelles in Solution
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Wang, N., Tian, H., Zhu, SY. et al. Two-dimensional Nitrogen-doped Mesoporous Carbon/Graphene Nanocomposites from the Self-assembly of Block Copolymer Micelles in Solution. Chin J Polym Sci 36, 266–272 (2018). https://doi.org/10.1007/s10118-018-2091-1
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DOI: https://doi.org/10.1007/s10118-018-2091-1