共查询到17条相似文献,搜索用时 109 毫秒
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超电容器活性炭/炭黑复合电极电容特性研究 总被引:3,自引:0,他引:3
为制备实用化的超电容器,对活性炭材料进行了表征,详细描述了活性炭/炭黑复合电极的制备工艺。通过循环伏安法和恒电流充电法,对活性炭/炭黑复合电极在水系电解液中的电容行为进行了研究。结果表明:活性炭的BET比表面积达1 654 m2/g,具有合理的孔径分布,主要在2 nm附近。添加高比表面积、高导电性纳米级炭黑制备的活性炭/炭黑复合电极具有优良的电容行为和较好的功率特性,复合电极的比容量达到102.4 F/g。此外还对孔径分布与电容的关系进行了阐述。 相似文献
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酚醛树脂制备超级电容器电极材料 总被引:1,自引:1,他引:0
以酚醛树脂为原料,NaOH为活化剂制备超级电容器用电极材料高比表面积活性炭(HSAAC),考察了制备条件对HSAAC碘值w(I)和比电容的影响。结果表明,在酚醛树脂炭化后加入NaOH,炭化温度为600℃、时间1h,活化温度为900℃、时间1h,制备的HSAAC的w(I)和比电容具有最大值,分别为1623mg/g、146.53F/g;而在固化前加入NaOH,制备的HSAAC的w(I)和比电容得到大幅度提高,分别为1895mg/g、240.99F/g,比电容接近其理论容量280F/g,但收率低,仅为10%。 相似文献
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Marko J. Tadjer Michael A. Mastro José M. Rojo Alberto Boscá Mojena Fernando Calle Francis J. Kub Charles R. Eddy Jr. 《Journal of Electronic Materials》2014,43(4):1188-1193
Manganese dioxide films were grown on large area flexible carbon aerogel substrates. Characterization by x-ray diffraction confirmed α-MnO2 growth. Three types of films were compared as a function of hexamethylenetetramine (HMTA) concentration during growth. The highest concentration of HM TA produced MnO2 flower-like films, as observed by scanning electron microscopy, whose thickness and surface coverage lead to both a higher specific capacitance and higher series resistance. Specific capacitance was measured to be 64 F/g using a galvanostatic setup, compared to the 47 F/g-specific capacitance of the carbon aerogel substrate. Such supercapacitor devices can be fabricated on large area sheets of carbon aerogel to achieve high total capacitance. 相似文献
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活性炭的制备及其在有机超级电容器中的应用 总被引:1,自引:0,他引:1
选择廉价的煤沥青为原料,经预处理和炭化,以KOH和CO2为活化剂在800℃进行物理活化和化学活化,制得活性炭。以1mol/LEt4NBF4/PC为电解液,制备超级电容器单元。测试结果表明,活性炭SBET达2352m2/g,总孔容为1.411cm3/g,平均孔径达2.399nm,振实密度达0.32g/cm3。制备的电容器为2.5V/5F,直流内阻为169m?,交流内阻为38m?,漏电流<2mA。4800次循环后,容量衰减<3%,能在–40~+60℃的宽温度范围内正常工作。 相似文献
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Feng Wang Jun Young Cheong Jiyoung Lee Jaewan Ahn Gaigai Duan Huiling Chen Qian Zhang Il-Doo Kim Shaohua Jiang 《Advanced functional materials》2021,31(31):2101077
Designing energy storage devices from thick carbon electrodes with high areal/volumetric energy density via a simple and green way is very attractive but still challenging. Cellulose, as an excellent precursor for thick carbon electrodes with abundant sources and low cost, is usually activated by a chemical activator and pyrolysis route to achieve high electrochemical performance. However, there are still some problems to be addressed, such as the harsh activation conditions, easy collapse of porous structures, and the high cost. Herein, a 3D self-supporting thick carbon electrode derived from wood-based cellulose is proposed for high areal and volumetric energy density of supercapacitor from a mild, simple, and green enzymolysis treatment. Benefiting from the high specific surface area (1418 m2 g−1) and abundant active sites on the surface of wood-derived hierarchically porous structures and enzymolysis-induced micropores and mesopores, the assembled symmetry supercapacitor from the thick carbon electrode can realize the high areal/volumetric energy density of 0.21 mWh cm−2/0.99 mWh cm−3 with excellent stability of 86.58% after 15 000 long-term cycles at 20 mA cm−2. Significantly, the simple and universal strategy to design material with high specific surface area, provides a new research idea for realizing multi-functional application. 相似文献