共查询到20条相似文献,搜索用时 15 毫秒
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方百增 《稀有金属(英文版)》2000,19(1):1-10
1 IntroductionElectrochemicalcapacitorsareuniqueenergystoragedevices ,whichexhibit2 0to2 0 0timesgreatercapacitancethanconven tionalcapacitors .Electrochemicalcapaci torscanbesimplyclassifiedintotwomaincategories:electricdouble layercapacitors(EDLCs) ,whichmain… 相似文献
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Xiaohong Xia Hongbo Liu Lei Shi Yuede He 《Journal of Materials Engineering and Performance》2012,21(9):1956-1961
Tobacco stem-based activated carbons (TS-ACs) were prepared by simple KOH activation and their application as electrodes in the electrical double layer capacitor (EDLC) performed successfully. The BET surface area, pore volume, and pore size distribution of the TS-ACs were evaluated based on N2 adsorption isotherms at 77?K. The surface area of the obtained activated carbons varies over a wide range (1472.8-3326.7?m2/g) and the mesoporosity was enhanced significantly as the ratio of KOH to tobacco stem (TS) increased. The electrochemical behaviors of series TS-ACs were characterized by means of galvanostatic charging/discharging, cyclic voltammetry, and impedance spectroscopy. The correlation between electrochemical properties and pore structure was investigated. A high specific capacitance value as 190?F/g at 1?mA/cm2 was obtained in 1?M LiPF6-EC/DMC/DEC electrolyte solution. Furthermore, good performance is also achieved even at high current densities. A development of new use for TS into a valuable energy storage material is explored. 相似文献
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目的研究海洋环境下高压脉冲电场对微生物污损的抑制效果和机理。方法采用刷涂法制备碳纤维/环氧防腐涂料复合涂层,研究碳纤维长度和含量对复合涂层的介电性能和表面能的影响以及碳纤维复合涂层在高压脉冲电场作用下的杀菌性能。结果高频电场下,碳纤维长度和含量是影响复合涂层介电性能的主要因素,随着电场强度、频率在设定范围内增加,涂层的杀菌率显著增大;而随占空比的增大,涂层的杀菌率呈先增后减最后趋于平缓的趋势,占空比为0.5时涂层的杀菌率最高达99.8%。结论掺杂0.1%(质量分数)5 mm碳纤维的复合涂层介电性能优良。高压脉冲电场对细菌具有良好杀灭效果,涂层的杀菌率最高可达99.97%。 相似文献
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氧化钌/活性炭超级电容器电极材料的研制 总被引:3,自引:0,他引:3
文描述了一种氧化钌/活性炭复合电极材料的制备方法,并对不同条件下制备的材料的循环伏安特性、交流阻抗特性进行了比较。使用该复合材料组装的模拟电化学超级电容器单电极比容量达到359F/g,远高于普通活性炭材料。与氧化钌电极材料相比,氧化钌/活性炭复合材料的高功率放电特性则有了明显的提高。 相似文献
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用无烟煤制备高比表面积活性炭的研究 总被引:1,自引:0,他引:1
以宁夏无烟煤为原料,采用KOH活化法制备高比表面积活性炭。首先考察了煤与KOH的混合方式对活性炭比表面积的影响,发现采用操作简单、省时的物理混合方法得到的结果优于浸渍法:然后以物理混合法为前提,考察了KOH与煤的比例、活化温度以及活化时间对活性炭比表面积和收率的影响。实验表明采用物理活化法,在氮气流量200mL/min的情况下,制备高比表面积活性炭的最佳活化条件为:KOH与煤的比例为6:1,活化温度为800℃,活化时间为1h:在此条件下可以得到以微孔为主,比表面积为2706m^2/g的活性炭。 相似文献
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《硬质合金》2019,(4):289-295
在电火花线切割加工过程中,会产生逐个的放电点,而放电点位置分布的均匀程度会对加工表面质量产生比较明显的影响。本文通过理论分析验证电位差法检测的合理性,并选定最优的标定函数,根据理论分析搭建电火花线切割放电点位置检测系统。对采集得到的数据研究直接导致对放电点位置检测以及评价的好坏。通过采用小波变换原理,对采集的原始放电点数据进行了去除噪点处理,探究电火花线切割加工过程中在25 ml/min蒸汽水雾介质中、在15 ml/min蒸汽水雾介质中他们的放电点位置均匀性是如何进行变化的,采用该系统采集了水雾中线切割精加工的放电点,验证了系统的实用性。 相似文献
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通过观测电火花放电现象对加工的影响,发现可控的双极性电火花加工能用更低的加工刀具磨损率获得比传统单极性电火花加工更高的材料去除率和效率,因此基于先进的电力电子技术,提出了一种双极性通用型电火花加工用脉冲电源,并给出相应的能量控制策略,还采用可提供连续正负脉冲输出的全桥电路作为该脉冲电源的主电路,并引入间隙电压和间隙电流的和作为唯一的控制量,在引弧阶段采用电压控制,在放电阶段采用电流控制。用一个电路完成放电间隙的击穿和放电能量的控制,减小脉冲电源系统的体积,同时在单个放电过程的各个阶段,对脉冲电压、放电电流、放电持续时间和消电离时间等参数进行合理灵活的调整,在维持放电频率一定的情况下,保证加工过程中单次放电能量的一致,从而实现高效均匀的电火花加工。 相似文献
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本文提出一种主要用于制造活性炭棒料专用的四柱液压机设计方案,活性炭专用四柱液压机与通用四柱液压机相比,开档减小了,结构更加紧凑,活动横梁工作行程减小,工作效率提高.液压机可手工上下料,也可与输送带联动,以提高效率. 相似文献
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针对永磁、电磁起重器在钢管吊装过程中存在的问题,提出了采用电脉冲永磁起重器的吊装方式;讨论了电脉冲永磁起重器在钢管自动化吊装应用中的布置形式以及影响拉脱力形成的因素,如钢管壁厚、气隙及接触面等。电脉冲永磁起重器具有永磁节能安全和电磁极性转换方便的优点,实现了钢管磁力起重器吊装自动化。 相似文献
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国际能源机构表示,中国可能在今年或2008年取代美国,成为世界第一大温室气体排放国。这一时间比该机构最近预计的2009年至少提前了一年。今年第一季度,中国经济增速达11.1%。 相似文献
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国际能源机构表示,中国可能在今年或2008年取代美国,成为世界第一大温室气体排放国.这一时间比该机构最近预计的2009年至少提前了一年.今年第一季度,中国经济增速达11.1%. 相似文献
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Electrical discharging machining (EDM) of carbon nano fiber (CNF) is introduced. CNF has been investigated as an emitter for field emission display (FED). For the uniform field emission, uneven CNFs need to be machined to uniform height. For the planarization of CNFs, EDM was used. EDM was conducted in air, unlike conventional EDM, to prevent the contamination of CNFs. For the uniformity of the machined surface, machining characteristics were investigated with applying different capacitance and voltage. With this method, the uniformity of field emission of CNFs was improved. Micro machining of CNFs was also studied. 相似文献
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A. Mehmet W. A. M. te Riele D. W. Boydell 《JOM Journal of the Minerals, Metals and Materials Society》1986,38(6):23-28
The feasibility of a process involving the use of activated carbon in a multistage column (NIMCIX contactor) for the recovery of gold from unclarified pregnant solutions was investigated on pilot-plant scale. It was found that satisfactory extractions, corresponding to a recovery of 99.6 percent, can be achieved with an average gold concentration of 0.0077 p.p.m. in the barren solutions from a feed averaging 1.89 p.p.m. The results show that excessive loading of CaCO3 can be prevented by lowering of the pH of the feed to about 7.6. This obviates the need for the carbon to be treated with hydrochloric acid. The gold was eluted from the carbon by the Zadra procedure. The operating conditions of the elution and electrowinning circuits are reported, and the elution of the gold and other metals is discussed. The reactivation of the carbon, which was carried out in a vibrating-deck kiln, is described, and the effects of this reactivation on the activity of the carbon and its microstructure are also discussed. The consumption of reagents in the adsorption and elution circuits is presented in sufficient detail to allow the potential of the activated-carbon process as an alternative to the Merrill-Crowe process for the treatment of high-grade solutions to be evaluated. In addition, the results of parallel small-scale investigations on the effect of pH on the loading of CaCO3, gold, and other metals on activated carbon are presented and discussed briefly. 相似文献