Structural and Electrochemical Characterization of Ethylenediaminated Single-Walled Carbon Nanotubes Prepared from Fluorinated SWCNTs
Structural and Electrochemical Characterization of Ethylenediaminated Single-Walled Carbon Nanotubes Prepared from Fluorinated SWCNTs
复制标题
DOI：
10.1021/jp503124n
复制
发表时间：
2014-07-10
影响因子：
3.7
通讯作者：
Sato, Yoshinori
中科院分区：
文献类型：
--
作者：
Bushimata, Kohei;Ogino, Shin-ichi;Sato, Yoshinori
以单壁碳纳米管为原料，通过乙二胺取代氟基团，制备了乙二胺单壁碳纳米管。采用扫描电子显微镜（SEM）、高分辨透射电子显微镜（HRTEM）、拉曼散射光谱、X射线衍射、X射线光电子能谱、Brunauer-Emmett-Teller比表面积测量、接触角测量、zeta电位分析和热重分析等方法对乙二胺胺化单壁碳纳米管进行了表征。此外，研究了具有独立式乙二胺单壁碳纳米管电极的基于30重量%硫酸水溶液电解质的双电层超级电容器（EDLSC）的性质。乙二胺官能化度分别为0.603 mmol/g和1.46 μ mol/m2，比表面积约为413.3 m2/g。从HRTEM观察，孤立的纳米管解开捆绑单壁碳纳米管存在于许多观察到的领域，和结构保留了纳米管骨架。具有乙二胺单壁碳纳米管电极的EDLSC的性能包括在10 mV/s的低扫描速率下94 F/g的平均比电容和在0.24 kW/kg的功率密度下2.6 Wh/kg的能量密度。EDLSC在1000 mV/s的高扫描速率下表现出67 F/g的平均比电容，在24 kW/kg的功率密度下表现出1.3 Wh/kg的能量密度，这些值上级羧化SWCNT电极的值。
We prepared ethylenediaminated single-walled carbon nanotubes (SWCNTs) from fluorinated SWCNTs by substituting fluorine groups with ethylenediamine groups. The ethylenediaminated SWCNTs were characterized by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), Raman scattering spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, Brunauer-Emmett-Teller surface area measurement by nitrogen adsorption, contact angle measurement, zeta potential analysis, and thermogravimetry. In addition, the properties of 30 wt % sulfuric acid aqueous electrolyte-based electric double-layer supercapacitors (EDLSCs) with free-standing ethylenediaminated SWCNT electrodes were investigated. The degree of ethylenediamine functionalization was 0.603 mmol/g and 1.46 mu mol/m(2), and the specific surface area was similar to 413.3 m(2)/g. From HRTEM observation, isolated nanotubes disentangled from the bundled SWCNTs were present in many observed areas, and the structures retained a nanotube skeleton. The properties of the EDLSCs with the ethylenediaminated SWCNT electrodes included an average specific capacitance of 94 F/g at a low scan rate of 10 mV/s and an energy density of 2.6 Wh/kg at a power density of 0.24 kW/kg. The EDLSCs exhibited an average specific capacitance of 67 F/g at a high scan rate of 1000 mV/s and an energy density of 1.3 Wh/kg at a power density of 24 kW/kg, values that were superior to those of carboxylated SWCNT electrodes.