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Comparison of porous carbons derived from sodium alginate and calcium alginate and their electrochemical properties

机译：藻酸钠和藻酸钙衍生的多孔碳的比较及其电化学性能

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摘要

Here, sodium alginate and calcium alginate which have the same carbon-forming component (alginic acid) and different regulation component (sodium/calcium) were used to prepare porous carbons, and comparisons were made of the microstructures and electrochemical properties of the obtained charcoals. The morphology was characterized by Scanning electron microscopy (SEM), and the results show that porous carbons can inherit plane or concave structures from their corresponding carbonized samples. The Horvath-Kawazoe (HK) method was used to analyze micropore size distributions, and the results show that, under the same mass ratio of potassium hydroxide to carbonized sample (KOH/C), the positions of extreme points on the two curves are similar, but the extreme values are different, and new extreme points appear at larger pore sizes with increases in the KOH/C ratio. The results of cyclic voltammetry (CV) and galvanostatic charge and discharge (GCD) tests show that the capacitance of sodium alginate-derived porous carbon is greater than that of porous carbon derived from calcium alginate when the KOH/C ratios are 2 and 4, and the size relationship is reversed when the KOH/C ratio is 3. The results of cycling performance tests show that the cycle numbers corresponding to the three stages on the two curves are similar under the same KOH/C ratio, but the cycle numbers at the same stage are significantly different under different KOH/C ratios.
机译：这里，使用具有相同碳形成组分（藻酸）和不同调节组分（钠/钙）的藻酸钠和藻酸钙制备多孔碳，并且对所得炭的微观结构和电化学性质进行比较。通过扫描电子显微镜（SEM）表征形态，结果表明，多孔碳可以从它们相应的碳化样品中捕获平面或凹形结构。 Horvath-Kawazoe（HK）方法用于分析微孔尺寸分布，结果表明，在氢氧化钾与碳化样品（KOH / C）的相同质量比下，两条曲线上的极端点的位置相似但是，极值是不同的，并且新的极端点出现在较大的孔径上，随着KOH / C比的增加。循环伏安法（CV）和电镀电荷和放电（GCD）试验结果表明，当KOH / C比率为2和4时，藻酸钠衍生的多孔碳的电容大于藻酸钙衍生自藻酸钙的多孔碳的电容。当KOH / C比率为3时，尺寸关系逆转。循环性能测试的结果表明，对应于两条曲线上的三个阶段的循环编号在相同的KOH / C比下类似，但循环编号在不同的KOH / C比率下相同的阶段显着差异。

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  • 来源
    《RSC Advances》 |2020年第4期|共7页
  • 作者

    Li Ming; Han Kuihua; Teng Zhaocai; Li Jinxiao; Wang Meimei; Li Xian;

  • 作者单位

    Shandong Univ Sch Energy &

    Power Engn Jinan 250061 Peoples R China;

    Shandong Univ Sch Energy &

    Power Engn Jinan 250061 Peoples R China;

    Shandong Univ Sch Energy &

    Power Engn Jinan 250061 Peoples R China;

    Shandong Univ Sch Energy &

    Power Engn Jinan 250061 Peoples R China;

    Shandong Univ Sch Energy &

    Power Engn Jinan 250061 Peoples R China;

    Shandong Univ Sch Energy &

    Power Engn Jinan 250061 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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