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Polymer Interfacial Self-Assembly Guided Two-dimensional Engineering of Hierarchically Porous Carbon Nanosheets.

07:00 EST 13th February 2020 | BioPortfolio

Summary of "Polymer Interfacial Self-Assembly Guided Two-dimensional Engineering of Hierarchically Porous Carbon Nanosheets."

Two-dimensional (2D) carbon nanosheets with micro- and/or mesopores have attracted great attention due to unique physical and chemical properties, but well-defined nanoporous carbon nanosheets with tunable thickness and pore size have been rarely realized. Here, we develop a polymer-polymer interfacial self-assembly strategy to achieve hierarchically porous carbon nanosheets (HNCNS) by integrating the migration behaviors of immiscible ternary polymers with block copolymer (BCP)-directed self-assembly. The balanced interfacial compatibility of BCP al-lows the migration of BCP-rich phase to the interface between two immiscible homo-polymer major phases (i.e., ho-mo-poly(methyl methacrylate) and homo-polystyrene), where BCP-rich phase spreads thinly to a thickness of a few nanometers to decrease the interfacial tension. BCP-directed co-assembly with organic-inorganic precursors con-structs an ordered mesostructure. Carbonization and chemical etching yield ultra-thin HNCNS with hierarchical micropores and mesopores. This approach enables facile control over the thickness (5.6 - 8.8 nm) and mesopore size (25 - 46 nm). As an anode material in a potassium ion battery, HNCNS shows high specific capacity (178 mA h g at current density of 1 A g) with excellent long-term stability (2000 cycles), by exploiting the advantages of the hierarchical pores and 2D nanosheet morphology (efficient ion/electron diffusion) and of the large interlayer spacing (stable ion insertion).

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This article was published in the following journal.

Name: Journal of the American Chemical Society
ISSN: 1520-5126
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