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首页> 外文期刊>Nanotechnology >Low-cost superior solid-state symmetric supercapacitors based on hematite nanocrystals
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Low-cost superior solid-state symmetric supercapacitors based on hematite nanocrystals

机译：基于赤铁矿纳米晶体的低成本优越的固态对称超级电容器

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摘要

We present a facile method for the fabrication of hematite nanocrystal-carbon cloth (Fe2O3-CC) composite. Hierarchical manganite is chosen as the sacrificial precursor, that does not contribute to the component of final iron oxide but can be in situ dissolved by the acid produced from the Fe3+ hydrolysis. This method effectively enhances the specific surface area and conductivity of hematite (Fe2O3) by attaching Fe2O3 nanocrystals (around 5 nm) firmly on the surface of carbon fibers. The obtained Fe2O3-CC can be directly used as a binder-free electrode for a supercapacitor. Interestingly, the composite electrode exhibits synergistic electrochemical capacitance (electrochemical double-layer capacitance and pseudo-capacitance). It manifests a very high areal capacitance of 1.66 F cm(-2) (1660 F g(-1)) at 2 mA cm(-2) and excellent cycling performance at large current densities (88.6% retention at 30 mA cm(-2) after 5000 cycles) in a three-electrode testing system, which is among the best performances reported in the literature. Importantly, when fabricated as a solid-state flexible symmetric supercapacitor it still shows a maximum energy density of 8.74 mW h cm(-3) and power density of 253.9 mW cm(-3). Additionally, its good flexibility makes it suitable for portable devices.
机译：我们提出了一种用于制造赤铁矿纳米晶 - 碳布（Fe2O3-CC）复合材料的容易方法。选择分层锰作为牺牲前体，对最终氧化铁的组分没有贡献，而是可以通过Fe3 +水解产生的酸原位溶解。该方法通过将Fe 2 O 3纳米晶体（约5nm）牢固地在碳纤维表面上牢固地加强赤铁矿（Fe 2 O 3）的比表面积和电导率。所得Fe 2 O 3-CC可以直接用作超级电容器的无粘合剂电极。有趣的是，复合电极表现出协同电化学电容（电化学双层电容和伪电容）。它体现的1.66˚F厘米非常高面积电容（-2）（1660 F G（-1））以2mA厘米（-2）和优异的循环性能在大的电流密度（88.6％保留在30mA厘米（ - 2）在5000次循环之后）在三电极测试系统中，这是文献中报告的最佳表现之一。重要的是，当制造为固态柔性对称超级电容器时，它仍然显示出8.74mW H cm（-3）的最大能量密度，并且功率密度为253.9 mw cm（-3）。此外，其良好的灵活性使其适用于便携式设备。

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  • 来源
    《Nanotechnology》 |2016年第50期|共12页
  • 作者

    Peng Shaomin; Yu Lin; Lan Bang; Sun Ming; Cheng Gao; Liao Shuhuan; Cao Han; Deng Yulin;

  • 作者单位

    Guangdong Univ Technol Guangdong Regular Higher Educ Inst Sch Chem Engn &

    Light Ind Key Lab Clean Chem Technol Guangzhou 510006 Guangdong Peoples R China;

    Guangdong Univ Technol Guangdong Regular Higher Educ Inst Sch Chem Engn &

    Light Ind Key Lab Clean Chem Technol Guangzhou 510006 Guangdong Peoples R China;

    Guangdong Univ Technol Guangdong Regular Higher Educ Inst Sch Chem Engn &

    Light Ind Key Lab Clean Chem Technol Guangzhou 510006 Guangdong Peoples R China;

    Guangdong Univ Technol Guangdong Regular Higher Educ Inst Sch Chem Engn &

    Light Ind Key Lab Clean Chem Technol Guangzhou 510006 Guangdong Peoples R China;

    Guangdong Univ Technol Guangdong Regular Higher Educ Inst Sch Chem Engn &

    Light Ind Key Lab Clean Chem Technol Guangzhou 510006 Guangdong Peoples R China;

    Guangdong Univ Technol Guangdong Regular Higher Educ Inst Sch Chem Engn &

    Light Ind Key Lab Clean Chem Technol Guangzhou 510006 Guangdong Peoples R China;

    Guangdong Univ Technol Guangdong Regular Higher Educ Inst Sch Chem Engn &

    Light Ind Key Lab Clean Chem Technol Guangzhou 510006 Guangdong Peoples R China;

    Georgia Inst Technol Sch Chem &

    Biomol Engn Atlanta GA 30318 USA;

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  • 正文语种 eng
  • 中图分类 特种结构材料;
  • 关键词

    hematite nanocrystal; hierarchical manganite; solid state; symmetric supercapacitor;

    机译：赤铁矿纳米晶;等级锰铁;固态;对称超级电容器;

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