Chemical Vapor Deposition of Carbon Nanocoils Three-Dimensionally in Carbon Fiber Cloth for All-Carbon Supercapacitors
Chemical Vapor Deposition of Carbon Nanocoils Three-Dimensionally in Carbon Fiber Cloth for All-Carbon Supercapacitors
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DOI：
10.1021/acsomega.8b02215
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发表时间：
2019-01
期刊：
影响因子：
4.1
通讯作者：
Shin Hu;Chi-young Lee;H. Chiu
中科院分区：
文献类型：
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作者：
Shin Hu;Chi-young Lee;H. Chiu
采用Au/K双催化剂辅助化学气相沉积技术，以C2 H2（g）为溶剂，在碳纤维布为基底，在纤维表面三维均匀生长高密度碳纳米线圈（CNCs）。沉积的基底（2.5 × 1.0 cm 2）显示出高的电化学活性表面积（16.53 cm 2），表明其作为电化学装置中的电极的潜在有用性。CNCs独特的一维（1D）螺旋结构缩短了离子在电解质中的扩散路径并产生有效的电子传导路径，使得观察到的串联电阻Rs较低（3.7 Ω）。通过采用双电极系统，在H2SO 4（aq）（1.0 M）中的液态超级电容器（SC）和具有浸入H2SO 4（aq）（1.0 M）/聚乙烯醇中的聚丙烯（PP）隔膜的固态SC被组装并通过使用基于CNC的电极进行研究。两种器件在各种扫描速率下的循环伏安法测量中均表现出近似矩形形状的轮廓。观察结果表明，它们的双电层电容行为。从它们的恒电流充电/放电曲线，测量到液体SC和固体SC的比电容分别为约137和163 F/g。此外，固态的基于CNC的SC具有优异的能量密度（15.3W h/kg）和功率密度（510 W/kg）。轻质固体SC（0.1965 g，2.5 × 1.0 cm 2）可弯曲至150°，并保留大部分性能。
An Au/K bicatalyst-assisted chemical vapor deposition process using C2H2(g) to grow high-density carbon nanocoils (CNCs) uniformly on the fibers in carbon fiber cloth substrates three-dimensionally was developed. An as-deposited substrate (2.5 × 1.0 cm2) showed a high electrochemical active surface area (16.53 cm2), suggesting its potential usefulness as the electrode in electrochemical devices. The unique one-dimensional (1D) helical structure of the CNCs shortened the diffusion pathways of the ions in the electrolyte and generated efficient electron conduction routes so that the observed serial resistance Rs was low (3.7 Ω). By employing two-electrode systems, a liquid-state supercapacitor (SC) in H2SO4(aq) (1.0 M) and a solid-state SC with a polypropylene (PP) separator immersed in H2SO4(aq) (1.0 M)/polyvinylalcohol were assembled and investigated by using CNC-based electrodes. Both devices exhibited approximate rectangular shape profiles in the cyclic voltammetry measurements at various scan rates. The observations indicated their electric double-layer capacitive behaviors. From their galvanostatic charge/discharge curves, the specific capacitances of the liquid SC and the solid SC were measured to be approximately 137 and 163 F/g, respectively. In addition, the solid-state CNC-based SC possessed excellent energy density (15.3 W h/kg) and power density (510 W/kg). The light weight solid SC (0.1965 g, 2.5 × 1.0 cm2) was bendable up to 150° with most of the properties retained.