Nanocomposite Electrode Materials Prepared from Pinus roxburghii and Hematite for Application in Supercapacitors

Q2 Engineering

Journal of the Korean wood science and technology Pub Date : 2022-05-01 DOI:10.5658/wood.2022.50.4.219

D. Shrestha

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引用次数: 2

Abstract

Wood-based nanocomposite electrode materials were synthesized for application in supercapacitors by mixing nanostructured hematite (Fe 2 O 3 ) with highly porous activated carbon (AC) produced from the wood-waste of Pinus roxburghii . The AC was characterized using various instrumental techniques and the results showed admirable electrochemical properties, such as high surface area and reasonable porosity. Firstly, AC was tested as an electrode material for supercapacitors and it showed a specific capacitance of 59.02 Fg –1 at a current density of 1 Ag –1 , cycle life of 84.2% after 1,000 cycles (at a current density of 3 Ag –1 ), and energy density of 5.1 Wh/kg at a power density of 135 Wkg –1 . However, when the AC was composited with different ratios of Fe 2 O 3 (1:1, 2:1, and 1:2), there was an overall improvement in its electrochemical performance. Among the 3 ratios, 2:1 (AC:Fe 2 O 3 ) had the best specific capacitance of 102.42 Fg –1 at 1 Ag –1 , cycle life of 94.4% capacitance after 1,000 cycles (at a current density of 3 Ag –1 ), and energy density of 8.34 Wh/kg at a power density of 395.15 Wkg –1 in 6 M KOH electrolyte in a 3-electrode experimental setup with a high working voltage of 1.55 V. Furthermore, when Fe 2 O 3 was doubled, 1:2 (AC:Fe 2 O 3 ), the electrochemical capacitive performance of the electrode twisted and deteriorated due to either the accumulation of Fe 2 O 3 particles within the composite or higher bulk resistance value of pure Fe 2 O 3 .

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刺松和赤铁矿制备的超级电容器用纳米复合电极材料

通过将纳米赤铁矿（Fe2O3）与由刺梨木废料产生的高孔活性炭（AC）混合，合成了用于超级电容器的木质纳米复合电极材料。使用各种仪器技术对AC进行了表征，结果显示出令人钦佩的电化学性能，如高表面积和合理的孔隙率。首先，AC被测试为超级电容器的电极材料，在1 Ag–1的电流密度下，其比电容为59.02 Fg–1，1000次循环后的循环寿命为84.2%（在3 Ag–2的电流密度），在135 Wkg–1的功率密度下，能量密度为5.1 Wh/kg。然而，当AC与不同比例的Fe2O3（1:1、2:1和1:2）复合时，其电化学性能得到了全面的改善。在这三种比例中，在1.55V的高工作电压的三电极实验装置中，2:1（AC:Fe 2 O 3）在1 Ag–1下具有102.42 Fg–1的最佳比电容，1000次循环后的循环寿命为94.4%的电容（在3 Ag–2的电流密度下），以及在6 M KOH电解质中395.15 Wkg–1的功率密度下的8.34 Wh/kg的能量密度。此外，当Fe2 O3增加1∶2（AC:Fe2 O3）时，由于复合材料中Fe2 O3颗粒的积累或纯Fe2 O3的体电阻值较高，电极的电化学电容性能发生扭曲和恶化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of the Korean wood science and technology Materials Science-Materials Science (miscellaneous)

CiteScore

5.20

自引率

0.00%

发文量

期刊介绍： The Journal of the Korean Wood Science and Technology (JKWST) launched in 1973 as an official publication of the Korean Society of Wood Science and Technology has been served as a core of knowledges on wood science and technology. The Journal acts as a medium for the exchange of research in the area of science and technology related to wood, and publishes results on the biology, chemistry, physics and technology of wood and wood-based products. Research results about applied sciences of wood-based materials are also welcome. The Journal is published bimonthly, and printing six issues per year. Supplemental or special issues are published occasionally. The abbreviated and official title of the journal is ''J. Korean Wood Sci. Technol.''. All submitted manuscripts written in Korean or English are peer-reviewed by more than two reviewers. The title, abstract, acknowledgement, references, and captions of figures and tables should be provided in English for all submitted manuscripts.