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基于马尾藻制备的活性炭的孔结构调控及其在超级电容器中的应用研究。

Investigation on pore structure regulation of activated carbon derived from sargassum and its application in supercapacitor.

机构信息

School of Thermal Engineering, Shandong Jianzhu University, Jinan, 250101, Shandong, China.

出版信息

Sci Rep. 2022 Jun 16;12(1):10106. doi: 10.1038/s41598-022-14214-w.

DOI:10.1038/s41598-022-14214-w
PMID:35710583
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9203837/
Abstract

In order to realize the effective regulation of the pore structure of activated carbon and optimize its pore structure properties as electrode material, the effects of activation temperature, activation time and impregnation ratio on the specific surface area, total pore volume and average pore diameter of activated carbon prepared by sargassum are studied by orthogonal experiment. In addition, the electrochemical properties of sargassum-based activated carbon (SAC) and the relationship between the gravimetric capacitance and specific surface area of SAC are also studied. The SACs prepared under all conditions have high specific surface area (≥ 2227 m g) and developed pore structure, in which the pore diameter of micropores mainly concentrated in 0.4 ~ 0.8 nm, the pore diameter of mesopores mainly concentrated in 3 ~ 4 nm, and the number of micropores is far more than that of mesopores. In the activation process, the impregnation ratio has the greatest effect on the specific surface area of SAC, the activation temperature and impregnation ratio have significant effect on the total pore volume of SAC, and the regulation of the average pore diameter of SAC is mainly realized by adjusting the activation temperature. The SACs exhibit typical electric double layer capacitance performances on supercapacitors, delivering superior gravimetric capacitance of 237.3 F g in 6 mol L KOH electrolyte system at current density of 0.5 A g and excellent cycling stability of capacitance retention of 92% after 10,000 cycles. A good linear relationship between gravimetric capacitance and specific surface area of SAC is observed.

摘要

为了实现活性炭孔结构的有效调控，优化其作为电极材料的孔结构性能，通过正交实验研究了海藻酸钠的活化温度、活化时间和浸渍比对活性炭比表面积、总孔体积和平均孔径的影响。此外，还研究了基于海藻酸钠的活性炭（SAC）的电化学性能以及 SAC 的比电容与其比表面积之间的关系。在所有条件下制备的 SAC 都具有高比表面积（≥2227 m g）和发达的孔结构，其中微孔的孔径主要集中在 0.4 ～ 0.8nm，介孔的孔径主要集中在 3 ～ 4nm，且微孔的数量远多于介孔。在活化过程中，浸渍比对 SAC 的比表面积影响最大，活化温度和浸渍比对 SAC 的总孔体积有显著影响，而 SAC 平均孔径的调节主要通过调节活化温度来实现。SAC 在超级电容器上表现出典型的双电层电容性能，在 6mol L KOH 电解质体系中，电流密度为 0.5 A g 时，比电容高达 237.3 F g，经过 10000 次循环后，电容保持率为 92%，具有优异的循环稳定性。SAC 的比电容与其比表面积之间存在良好的线性关系。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e263/9203837/cb4b86d0794a/41598_2022_14214_Fig13_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e263/9203837/7576127e38f2/41598_2022_14214_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e263/9203837/f84d785c9227/41598_2022_14214_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e263/9203837/25ec786f60d6/41598_2022_14214_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e263/9203837/e577f8df0004/41598_2022_14214_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e263/9203837/8cf4d23faacb/41598_2022_14214_Fig10_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e263/9203837/5499e04d4728/41598_2022_14214_Fig12_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e263/9203837/cb4b86d0794a/41598_2022_14214_Fig13_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e263/9203837/2c7bbf176d15/41598_2022_14214_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e263/9203837/7b345b462cef/41598_2022_14214_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e263/9203837/507fcb882432/41598_2022_14214_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e263/9203837/6dc3597d26b3/41598_2022_14214_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e263/9203837/e217b10fe7f0/41598_2022_14214_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e263/9203837/7576127e38f2/41598_2022_14214_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e263/9203837/f84d785c9227/41598_2022_14214_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e263/9203837/25ec786f60d6/41598_2022_14214_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e263/9203837/e577f8df0004/41598_2022_14214_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e263/9203837/8cf4d23faacb/41598_2022_14214_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e263/9203837/9caeaa4dc2bd/41598_2022_14214_Fig11_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e263/9203837/5499e04d4728/41598_2022_14214_Fig12_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e263/9203837/cb4b86d0794a/41598_2022_14214_Fig13_HTML.jpg

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