High-frequency carbon supercapacitors from polyfurfuryl alcohol
High-frequency carbon supercapacitors from polyfurfuryl alcohol
复制标题
DOI：
10.1016/j.jpowsour.2010.12.111
复制
发表时间：
2011-09
期刊：
影响因子：
--
通讯作者：
V. Ruiz;A. Pandolfo
中科院分区：
文献类型：
--
作者：
V. Ruiz;A. Pandolfo
通过聚糠醇（PFA）的化学活化制备具有可控且窄孔径分布的多孔碳。获得了高表观BET表面积，高达2600 m2g−1（密度泛函理论（DFT）为2611 m2g−1）和良好的电导率（高达∼130 S cm−1）。通过改变氢氧化钾：碳前驱体的比例，可以定制具有不同比例的微孔和细介孔（<5 nm）的碳，为电化学储能装置（例如双电层电容器）提供理想的电子和离子孔结构。使用 1 M 四氟硼酸四乙铵的乙腈溶液，在 2.5 V 电压窗口中获得高达 147 F g−1 的高比电容值。此外，还表现出了优异的大电流和高频性能：225 A g−1(10 Hz) 时为 100 F g−1，100 Hz 时为 ∼30 F g−1。当与具有相似质地特性的商用活性炭 (AC) 进行性能比较时，PFA 衍生的 AC 在更高的电容值和改进的倍率能力方面表现出更好的性能。 1 kHz 时电容值增加 125%。
Porous carbons with controllable and narrow pore-size distributions are prepared from the chemical activation of polyfurfuryl alcohol (PFA). HighapparentBET surface areas, up to 2600 m2g−1(2611 m2g−1by Density Functional Theory (DFT)), and good electrical conductivities (up to ∼130 S cm−1) are obtained. By varying the potassium hydroxide: carbon precursor ratio, the preparation of carbons with different proportions of micro- and fine mesoporosity (<5 nm) can be tailored to provide an ideal electronic and ionic pore structure for electrochemical energy-storage devices, such as electrical double-layer capacitors. High specific capacitance values are obtained up to 147 F g−1in a voltage window of 2.5 V using 1 M tetraethyl ammonium tetrafluoroborate in acetonitrile. Moreover, excellent high-current and high-frequency performance is demonstrated: 100 F g−1at 225 A g−1(10 Hz) and ∼30 F g−1at 100 Hz. When comparing the performance with commercial activated carbons (ACs) of similar textural properties, the PFA-derived ACs demonstrated better performance in terms of higher capacitance values and improved rate capabilities. There is a 125% increase in capacitance values at 1 kHz.