共查询到19条相似文献,搜索用时 78 毫秒
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炭基双电层电容器的工艺研究及优化 总被引:2,自引:1,他引:2
以化学和物理性质稳定、导电性好的活性炭纤维(ACF)为电极材料,KOH溶液为电解液,研制炭基双电层电容器。研究了电解液浸渍电极时体系的真空度、KOH质量分数、电极片组成及厚度对双电层电容器性能的影响,并通过正交实验优化制备双电层电容器的工艺条件。结果显示,高真空度、高质量分数电解液有助于提高电容量。以质量分数40%KOH溶液为电解液,电极组成为ACF:石墨:聚四氟乙烯=1.6:0.4:1,单个电极片质量为0.10g的最佳工艺条件,得到的双电层电容器中活性炭纤维的比电容可达到152.81F/g。 相似文献
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片式多层陶瓷电容器市场广阔 总被引:1,自引:0,他引:1
《陶瓷研究与职业教育》1996,(2)
片式多层陶瓷电容器市场广阔片式多层陶瓷电容器(简称片式MLC)是世界上发展最快、市场用量最多的片式元件。我国在“六五”至“八五”期间,先后从国外引进了18条片式MLC生产线,年设计生产能力为46.85亿只,1995年的实际产量达到28.2亿只,为设计... 相似文献
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石墨烯以其超高导电性和超大比表面的独特优势常被应用于对称超级电容器的电极材料,然而二维石墨烯纳米片层间的范德华力容易导致片层堆叠。并且水溶液作为电解质组装的超级电容器在充电过程中可能发生水分解反应导致充电电压受限从而极大地降低它的能量密度。基于此,本研究采用水热法制备了硫、氮共掺杂的三维石墨烯气凝胶电极材料,研究了石墨烯材料的微观形貌、表面化学性质及水热反应时间对材料电化学性能的影响。结果表明:S,N-rGO-2具有发达的孔结构和高含量的杂原子。在5mV/s的扫描速率下比电容高达358.5F/g,使用固态电解质组装的全固态超级电容器充电电压可以达到1.8V,在1A/g的电流密度下比电容高达118.3F/g,能量密度达到14.9Wh/kg,并且10000次充/放电后的比电容保留率和库仑效率均接近100%。S,N-rGO-2表现出优异的双电层电容性能,可作为有潜力的超级电容器电极材料。 相似文献
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The basic structural features of a double-layer energy storage capacitor, the characteristics of the acting mock-up of such
a capacitor, and the features of use of woven and nonwoven materials, including activated carbon fibre materials, in it were
examined. The capacitor has a capacitance of up to 400 F and provides a starting current of up to 700 A, so that it can be
successfully used in starting a Volga automobile in winter.
A. Ya. Lyalyushkin and A. G. Zotov participated in the experimental part of the research.
Translated from Khimicheskie Volokna, No. 3, pp. 35–38, May–June, 1997. 相似文献
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Synthesis, characterization, and electrochemical capacitance of amino-functionalized carbon nanotube/carbon paper electrodes 总被引:1,自引:0,他引:1
Amino-functionalization of carbon nanotubes (CNTs) attached to carbon paper (CP) has been achieved using one synthesis protocol: (i) chemical oxidation, (ii) acyl chlorination, and (iii) amidation. The amidation reaction of the carboxylic groups in oxidized the CNT/CP hybrids enables the formation of terminal amino groups on the CNT sidewalls. The functionalized CNTs were characterized by Raman spectroscopy, X-ray photoelectron spectroscopy, Fourier transformed infrared spectroscopy, thermal programmed desorption, and N2 adsorption. The cyclic voltammetry curves of an amino-modified CNT-based capacitor showed a continuum of double-layer and pseudocapacitive behavior. The presence of surface oxides and amides on CNTs imparts not only hydrophilic coverage for the formation of double-layer (double-layer capacitance) but also active sites for the redox reaction (pseudocapacitance). Based on the result of the charge/discharge cycling test, the N-modified CNT/CP capacitor exhibits an enhanced capacitance, high-rate capability, and capacitance stability with high coulombic efficiency. 相似文献
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Magdalena Skunik-Nuckowska Katarzyna Grzejszczyk Krzysztof Stolarczyk Renata Bilewicz Pawel J. Kulesza 《Journal of Applied Electrochemistry》2014,44(4):497-507
Effective integration of electrochemical devices consisting of enzyme-based biobatteries together with high power double-layer type capacitors is discussed here. An ultimate goal is to overcome a typical drawback of enzymatic power sources (biofuel cells and biobatteries): although their energy is potentially high enough to fulfill the needs of small electronic devices, their power is often too low. It is demonstrated that properly selected capacitor can support operation of such a low power device simply by supplying appropriate power pulses with fast dynamic response that is required for many applications involving fluctuating loads. Our model integrated system is obtained by coupling a series of double-layer capacitors with well-behaved zinc/oxygen biobattery. The biobattery utilizes a stable cathodic material composed of covalently phenylated single-walled carbon nanotubes and the oxygen reduction enzyme, laccase, together with the hopeite-covered zinc rod acting as the anode. The enzymatic power source was characterized by the maximum power density of 1.8 mW cm?2, the open circuit voltage of 1.6 V. Nevertheless, under the 50 Ω loading, the voltage of biobattery (electrode surface areas of ca. 0.3 cm2) drops to 0 V after 2 s. The practical performance (power stability) of a biobattery has significantly improved by its parallel connection to electrochemical capacitor. The importance of such capacitor’s parameters as low resistance (not more than a few hundred of milliohms), proper capacitance, and leakage current (not higher than a few microamperes) is emphasized here. The potential utility of the optimized biobattery/supercapacitor system is discussed in terms of use as a source of power to operate a digital watch. 相似文献
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以活性碳纤维(ACF)电极为研究对象,用质量分数为0.2的氢氧化钾(KOH)作为电解液制作KOH-ACF浸渍电极,研究了浸泡时间、搅拌、真空度、温度等的影响因素,目的使电解液能更有效的进入ACF电极,研究发现,浸泡时间长、真空度高和温度低都有利于电解液进入电极,搅拌可以加快浸泡吸附的速度,制成的双电层电容器比电容可达70F/g。 相似文献
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We report on a one-step binder-free fabrication method for electrochemical double layer (EDL) capacitor electrodes consisting of vertically-oriented graphene uniformly grown on a metallic current collector. The double-layer capacitive behavior of the resulting electrode is studied in both aqueous and organic electrolytes. Compared with conventional graphene-based EDL capacitor electrode fabrication methods, this method offers the following advantages: (a) no need to use a binder, (b) open channels for better ion access, and (c) exposed edge planes for improved material wettability. These unique features lead to excellent capacitive behavior in organic electrolytes, including a specific capacitance slightly higher than that in aqueous electrolytes at the same potential scan rate and a high knee frequency (~3174 Hz in the current work). 相似文献
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Tuğçe P. Öztürk Onur B. Özdemir Ali Gelir Nahid A. Keshtiban Önder Yargı Selin Pıravadılı Mucur Alper Seçgin 《应用聚合物科学杂志》2024,141(4):e54854
Solid-state electrolytes such a further novel finding is going to have great importance because of the disadvantages of liquid electrolytes such as electrochemical instability, low ion selectivity, and interface contact. It is anticipated that the use of solid-state electrolytes including supercapacitors (SCs) will become widespread with decreasing self-leakage and environmental damage more than liquid electrolytes. In this study, SCs with graphene/PEDOT: PSS coated electrodes and binary PVA gel electrolytes with a conductive layer were designed and the electrochemical performance of the configurations was characterized. The effects of the conductive layer between binary electrolytes and the concentration of the KOH solution in the electrolytes were studied. It was observed that the conductive layer used between the gel electrolytes causes additional charging at the electrolyte/conductive layer interface and behaves like a serially connected capacitor to the double-layer capacitor. Interestingly, at a slow sweep rate (5 mV/s), the specific capacitance values of the assembled SCs decreased when a conductive layer was used but it increased when the sweep rate was fast (100 mV/s). 相似文献