Functionalized highly porous graphitic carbon fibers for high-rate supercapacitive electrodes
Functionalized highly porous graphitic carbon fibers for high-rate supercapacitive electrodes
复制标题
用于高倍率超级电容电极的功能化高多孔石墨碳纤维
DOI：
10.1016/j.nanoen.2015.03.033
复制
发表时间：
2015-04
期刊：
影响因子：
17.6
通讯作者：
Fan, Hong Jin
中科院分区：
文献类型：
--
作者：
Yi, Huan;Zhu, Changrong;Wang, Xuefeng;Fan, Hong Jin
将高比表面积（SSA）和优异的电导率结合在一起是碳材料在电容储能中的重要应用。在此，通过在相对较低的加工温度（800°C）下使用熔融金属钠活化天然棉花，我们获得了分层多孔石墨碳纤维（HPGCFs），其SSA高达1716 m2 - 1，并且在块状状态下石墨化程度很高。与传统的热退火和koh活化得到的非晶碳纤维相比，这是有利的。所得的hpgcf具有显著的储能性能（1 ~ 60 A g−1范围内电容保持率为61%）。为了进一步提高电容值，选择蒽醌（AQ）分子通过π -π堆叠相互作用对hpgcf进行功能化。在h2so4水溶液中，以HPGCFs为正极，AQ-HPGCFs为负极组装了不对称超级电容器。该器件具有高能量密度（在0 ~ 1.2 V的应用电位范围内为19.3 Wh kg−1）和超高功率（高达120 a g−1,0.8 s内充满充放电）。
Combining high specific surface area (SSA) and superior electrical conductivity together at bulk state is very important for carbon materials in capacitive energy storage applications. Herein, by applying molten sodium metal to activate natural cotton at a relatively low processing temperature (800 °C), we have obtained hierarchically porous graphitic carbon fibers (HPGCFs) with SSA up to 1716 m2g−1and a high degree of graphitization in the bulk state. This is advantageous compared to amorphous carbon fibers obtained by conventional thermal annealing and KOH-activation. The obtained HPGCFs show remarkable energy storage capability (61% capacitance retention from 1 to 60 A g−1). To further increase the capacitance value, anthraquinone (AQ) molecules have been selected to functionalize HPGCFs via π–π stacking interactions. Asymmetric supercapacitors have been assembled using HPGCFs as the positive electrode and AQ-HPGCFs as the negative electrode in aqueous H2SO4solution. The device presents a large energy density (19.3 Wh kg−1in the applied potential range between 0 and 1.2 V) and ultrahigh power capability (up to 120 A g−1, a full charge–discharge within 0.8 s).
登录
查看更多内容
影响因子：
--
作者：
Hui Peng;Guofu Ma;K. Sun;Jingjing Mu;Z. Lei
通讯作者：
Hui Peng;Guofu Ma;K. Sun;Jingjing Mu;Z. Lei
影响因子：
10.9
作者：
Maciá-Agulló, JA;Moore, BC;Linares-Solano, A
通讯作者：
Linares-Solano, A
影响因子：
32.5
作者：
Biswal, Mandakini;Banerjee, Abhik;Ogale, Satishchandra
通讯作者：
Ogale, Satishchandra
影响因子：
17.6
作者：
Anjos, Daniela M.;McDonough, John K.;Presser, Volker
通讯作者：
Presser, Volker
影响因子：
9.2
作者：
Bhattacharjya, Dhrubajyoti;Yu, Jong-Sung
通讯作者：
Yu, Jong-Sung