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首页> 外文期刊>RSC Advances >Sucrose-templated interconnected meso/macro-porous 2D symmetric graphitic carbon networks as supports for alpha-Fe2O3 towards improved supercapacitive behavior
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Sucrose-templated interconnected meso/macro-porous 2D symmetric graphitic carbon networks as supports for alpha-Fe2O3 towards improved supercapacitive behavior

机译：蔗糖模板互连的互联的Meso /宏观多孔2d对称碳网络作为α-Fe2O3朝向改善的超级电容行为的支持

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摘要

In this study, ultrahigh electrochemical performance for interconnected meso/macro-porous 2D C@alpha-Fe2O3 synthesized via sucrose-assisted microwave combustion is demonstrated. Hematite (alpha-Fe2O3) synthesized via the same approach gave an encouraging electrochemical performance close to its theoretical value, justifying its consideration as a potential supercapacitor electrode material; nonetheless, its specific capacitance was still low. The pore size distribution as well as the specific surface of bare alpha-Fe2O3 improved from 145 m(2) g(-1) to 297.3 m(2) g(-1) after it was coated with sucrose, which was endowed with ordered symmetric single-layer graphene (2D graphene). Accordingly, the optimized hematite material (2D C@alpha-Fe2O3) showed a specific capacitance of 1876.7 F g(-1) at a current density of 1 A g(-1) and capacity retention of 95.9% after 4000 cycles. Moreover, the material exhibited an ultrahigh energy density of 93.8 W h kg(-1) at a power density of 150 W kg(-1). The synergistic effect created by carbon-coating alpha-Fe2O3 resulted in modest electrochemical performance owing to extremely low charge transfer resistance at the electrode-electrolyte interface with many active sites for ionic reactions and efficient diffusion process. This 2D C@alpha-Fe2O3 electrode material has the capacity to develop into a cost-effective and stable electrode for future high-energy-capacity supercapacitors.
机译：在该研究中，证明了通过蔗糖辅助微波燃烧合成的互连的Meso /宏观多孔2d C 2α-Fe 2 O 3的超高电化学性能。通过相同方法合成的赤铁矿（Alpha-Fe2O3）给出了令人鼓舞的电化学性能，接近其理论值，使其考虑为潜在的超级电容器电极材料;尽管如此，其特定电容仍然很低。孔径分布以及裸α-Fe2O3的比表面从145米（2 )g（-1）到297.3M（2）g（2）g（-1）涂有蔗糖后，其赋予有序对称单层石墨烯（2D石墨烯）。因此，优化的赤铁矿材料（2D C-Fe2O3）显示了1876.7fg（-1）的特定电容，电流密度为1Ag（-1），并且在4000次循环后的容量保持95.9％。此外，该材料以150W kg（-1）的功率密度为93.8WH kg（-1）的超高能量密度。由碳涂层α-Fe2O3产生的协同效果导致电极 - 电解质界面极低的电荷转移电阻，具有许多活性位点，用于离子反应和有效的扩散过程。该2D C @ Alpha-Fe2O3电极材料具有开发成具有成本效益和稳定的电极，用于未来的高能容量超级电容器。

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  • 来源
    《RSC Advances》 |2020年第27期|共12页
  • 作者

    Bonsu Jacob Otabil; Han Jeong In;

  • 作者单位

    Dongguk Univ Seoul Dept Energy &

    Mat Engn Seoul 04620 South Korea;

    Dongguk Univ Seoul Dept Chem &

    Biochem Engn Seoul 04620 South Korea;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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