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High-performance supercapacitors based on novel carbons derived from Sterculia lychnophora

机译：基于源自贪睡小er的新型碳的高性能超级电容器

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摘要

In this paper, two nanoporous carbons were prepared from Sterculia lychnophora (SL) by simple hydrothermal conditions followed by a KOH activation step with and without a carbonization process. Structural characterization indicates that the carbon sample without the carbonization process (AC-1) exhibits a cross linked and hole-like structure, a BET surface area of 2589 m(2) g(-1), pore volume of 1.21 cm(3) g(-1) and BJH average pore width of 2.78 nm. The carbon sample with the carbonization process (AC-2) shows dozens of nanometer microspheres, a BET surface area of 2660 m(2) g(-1), pore volume of 1.258 cm(3) g(-1) and BJH average pore width of 3.321 nm. The electrochemical capacitance behaviors of these carbon materials were investigated in KOH and NaNO3 aqueous solutions in three and two-electrode cells, respectively. By using the NaNO3 electrolyte, the efficient capacitor can work in a wider voltage window of 1.7 V without any significant capacitance fading over 3000 cycles; the highest specific capacitance of 47.8 F g(-1) and energy density of 18.5 W h kg(-1) are demonstrated. The desirable porous structure and electrochemical characteristics may enable SL biomass based carbon to be excellent electrode materials for high performance electrical energy storage devices.
机译：在本文中，通过简单的水热条件，由Sterculia lychnophora（SL）制备了两个纳米孔碳，然后进行了有无碳化过程的KOH活化步骤。结构表征表明未进行碳化过程（AC-1）的碳样品表现出交联的孔状结构，BET表面积为2589 m（2）g（-1），孔体积为1.21 cm（3） g（-1）和BJH的平均孔径为2.78 nm。具有碳化过程（AC-2）的碳样品显示了数十个纳米微球，BET表面积为2660 m（2）g（-1），孔体积为1.258 cm（3）g（-1），平均BJH孔宽度为3.321nm。在三电极和两电极电池中分别在KOH和NaNO3水溶液中研究了这些碳材料的电化学电容行为。通过使用NaNO3电解质，高效电容器可以在1.7V的较宽电压范围内工作，而在3000次循环中电容没有明显下降。最高比电容为47.8 F g（-1），能量密度为18.5 W h kg（-1）。期望的多孔结构和电化学特性可以使基于SL生物质的碳成为用于高性能电能存储设备的极好的电极材料。

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