杂原子
剥脱关节
石墨烯
材料科学
兴奋剂
化学工程
相(物质)
碳纤维
纳米技术
液相
无机化学
化学
有机化学
复合数
复合材料
光电子学
工程类
物理
热力学
戒指(化学)
作者
Weiqian Tian,Qiuming Gao,Armin VahidMohammadi,Jie Dang,Zeyu Li,Xiao Liang,Mahiar Hamedi,Liming Zhang
标识
DOI:10.1016/j.cej.2020.127601
摘要
• Developing a liquid exfoliation strategy for delaminating multilayered biochars. • The graphene-like carbon nanosheets (Fe-N-S-CNS) had multi-heteroatom co-doping. • Fe-N-S-CNS showed multifunctional electrochemical activity. • A higher ORR activity was obtained than that of commercial Pt/C. • The ionic liquid-based supercapacitor delivered an energy density of 54.1 Wh kg −1 . We here report a liquid-phase exfoliation strategy to delaminate multilayered biochars into multi-heteroatom (Fe, N, S) co-doped graphene-like carbon nanosheets, in which the multilayered biochars derived from naturally evolved layer-by-layer precursors. This strategy provides the versatile capability to tailor the textural properties of the as-synthesized carbon nanosheets, such as obtaining a controllable specific surface area of up to 2491 m 2 g −1 . Thanks to the unique integration of graphene-like microstructures with a thickness of 4.3 nm, large specific surface area and hierarchical pores, homogenous co-doping of N, S, and Fe, and high electronic conductivity, the as-synthesized Fe-N-S co-doped carbon nanosheets could act as multifunctional electrodes for electrocatalytic process of oxygen reduction reaction (ORR) and capacitive energy storage. The optimized nanosheets showed a better ORR catalytic performance than commercial Pt/C catalyst, with a more positive onset potential (1.026 V) and half-wave potential (0.829 V), higher long-term stability, and outstanding methanol tolerance in alkaline mediums. Furthermore, the porous carbon nanosheets exhibited excellent supercapacitive performances which delivered a high energy density of 29.1 Wh kg −1 at a high power density of up to 39.5 kW kg −1 in an ionic liquid electrolyte. This liquid-phase exfoliation strategy will offer new inspiration for the synthesis of various biomass-derived graphene-like carbon nanosheets for multifunctional applications.
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