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Effect of removing potassium ions from activated carbon on its electrochemical performance for supercapacitors

机译：从活性炭中除去钾离子对超级电容器电化学性能的影响

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摘要

To produce pure activated carbon (AC) with a low potassium ion (K+) content for supercapacitors, coconut shell-derived AC activated by KOH was treated using a novel oxidation-ultrasound process based on hydrochloric acid (HCl) washing. The effects of different treatment conditions on the K+ content of AC were investigated, and the physical properties of the as-prepared samples were characterized by scanning electron microscopy (SEM) and N-2 adsorption-desorption isotherms. The electrochemical performance of AC as a supercapacitor electrode was characterized by cyclic voltammetry (CV), galvanostatic charge-discharge (GC) and electrochemical impedance spectroscopy (EIS). The results showed that the AC that was washed with 1.0 wt% HCl solution for 120 min and subsequently treated with 0.6 wt% H2O2 solution at 60 degrees C in an ultrasonic oscillator for 8 h possessed a K+ content of 46 mg kg(-1), which was much lower than the value of 417 mg kg(-1) found for the AC that did not undergo oxidation-ultrasound treatment. Moreover, the AC subjected to oxidation-ultrasound treatment possessed a large specific surface area and pore volume of 3460 m(2) g(-1) and 1.869 cm(3) g(-1), respectively. In terms of the electrochemical performance, this exhibited a high specific capacitance of 306 F g(-1) at a current density of 1 A g(-1) in 1 M H2SO4 electrolyte and remained at 294 F g(-1) with a capacitance retention of 96% after 3000 cycles, indicating excellent stability and capacitive behavior of the AC electrode with respect to its use as a supercapacitor.
机译：为了生产具有低钾离子（K +）含量的纯活性炭（AC），用于超级电容器，使用基于盐酸（HCl）洗涤的新型氧化超声过程来处理通过KOH活化的椰子壳衍生的AC。研究了不同处理条件对AC的K +含量的影响，并通过扫描电子显微镜（SEM）和N-2吸附 - 解吸等温线的制备样品的物理性质。 Ac作为超级电容器电极的电化学性能以循环伏安法（CV），电热电荷 - 放电（GC）和电化学阻抗光谱（EIS）为特征。结果表明，用1.0wt％HCl溶液洗涤的AC 120分钟，随后在60℃下在60℃下用0.6wt％H 2 O 2溶液处理8小时，具有46mg kg（-1）的k +含量，该值远低于417mg kg（-1）的价值，该价为不经历氧化超声处理的Ac。此外，经受氧化 - 超声处理的AC具有分别具有3460μm（2）克（-1）和1.869cm（3 )g（3）克（-1）的大的比表面积和孔体积。就电化学性能而言，这在1MH2SO4电解质中的电流密度为1Ag（-1）的电流密度，并且留在294f g（-1）中具有高比电容。 3000次循环后电容保持为96％，表明AC电极的优异稳定性和电容性能相对于其用作超级电容器。

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  • 来源
    《RSC Advances》 |2015年第91期|共7页
  • 作者

    Hou Min; Sun Kang; Deng Xianlun; Xiao Fenglong; Yang Hua;

  • 作者单位

    CAF Inst Chem Ind Forest Prod Natl Engn Lab Biomass Chem Utilizat Key &

    Open Lab Forest Chem Engn SFA Nanjing 210042 Jiangsu Peoples R China;

    CAF Inst Chem Ind Forest Prod Natl Engn Lab Biomass Chem Utilizat Key &

    Open Lab Forest Chem Engn SFA Nanjing 210042 Jiangsu Peoples R China;

    CAF Inst Chem Ind Forest Prod Natl Engn Lab Biomass Chem Utilizat Key &

    Open Lab Forest Chem Engn SFA Nanjing 210042 Jiangsu Peoples R China;

    CAF Inst Chem Ind Forest Prod Natl Engn Lab Biomass Chem Utilizat Key &

    Open Lab Forest Chem Engn SFA Nanjing 210042 Jiangsu Peoples R China;

    CAF Inst Chem Ind Forest Prod Natl Engn Lab Biomass Chem Utilizat Key &

    Open Lab Forest Chem Engn SFA Nanjing 210042 Jiangsu Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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