知识与财富的链接
0引言电化学电容器(Electrochemical Capacitors),又称为超级电容器(supercapacitors)是介于传统电容器和二次电池之间的一种新型储能装置,它具有循环寿命长、比容量高、能快速充放电等优点[1,2]。近年来随着电子、电气设备的日趋小型化以及电动汽车工业的不断发展,作为后备电源和记忆候补装置的超级电容器日益引起了人们的广泛关注。碳材料由于具有成本低、比表面积大、导电性优良、制备电极工艺简单等特点,一直是超级电容器电极材料的首选。其中,活性炭是最早采用的多孔电极材料,其比表面积可高达2500￣3000m·2g-1[3]。然而,活性炭材料…
A series of ordered mesoporous carbons have been synthesized via a simple template method using mesopore silica molecular sieve SBA-15 as template and commercial available phenol-formaldehyde resin as carbon precursor. The samples were characterized by X-ray diffraction(XRD), transmission electron microscopy (TEM) and nitrogen adsorption. The order and the specific surface area of the mesoporous carbon can be adjusted by the concentration of the resin. When the concentration was fixed at 0.15 g·mL-1, the highest order and the largest specific surface area of 1 017 m2·g-1 were obtained. The Cyclic Voltammetry(CV)test result shows that the specific capacitance of C0.15 sample is 222 F·g-1, when the scanning rate is 2 mV·s-1; and 159 F·g-1 when the scanning rate increases to 50 mV·s-1. Due to the differences of the pore structure, the ordered mesoporous carbons have better electrochemical capacitance than the activated carbon.
