Lin Jian, Zhong Jiebin, Bao Duoduo, Reiber-Kyle Jennifer, Wang Wei, Vullev Valentine, Ozkan Mihrimah, Ozkan Cengiz S
Department of Mechanical Engineering, University of California, Riverside, CA 92521, USA.
J Nanosci Nanotechnol. 2012 Mar;12(3):1770-5. doi: 10.1166/jnn.2012.5198.
We describe the fabrication of highly conductive and large-area three dimensional pillared graphene nanostructure (PGN) films from assembly of vertically aligned CNT pillars on flexible copper foils for applications in electric double layer capacitors (EDLC). The PGN films synthesized via a one-step chemical vapor deposition process on flexible copper foils exhibit high conductivity with sheet resistance as low as 1.6 ohms per square and possessing high mechanical flexibility. Raman spectroscopy indicates the presence of multi walled carbon nanotubes (MWCNT) and their morphology can be controlled by the growth conditions. It was discovered that nitric acid treatment can significantly increase the specific capacitance of the devices. EDLC devices based on PGN electrodes (surface area of 565 m2/g) demonstrate enhanced performance with specific capacitance value as high as 330 F/g extracted from the current density-voltage (CV) measurements and energy density value of 45.8 Wh/kg. The hybrid graphene-CNT nanostructures are attractive for applications including supercapacitors, fuel cells and batteries.
我们描述了通过在柔性铜箔上组装垂直排列的碳纳米管柱来制造用于双电层电容器（EDLC）的高导电性大面积三维柱状石墨烯纳米结构（PGN）薄膜。通过一步化学气相沉积工艺在柔性铜箔上合成的PGN薄膜具有高导电性，方阻低至1.6欧姆每平方，并且具有高机械柔韧性。拉曼光谱表明存在多壁碳纳米管（MWCNT），其形态可以通过生长条件来控制。发现硝酸处理可以显著提高器件的比电容。基于PGN电极（表面积为565 m2/g）的EDLC器件表现出增强的性能，从电流密度-电压（CV）测量中提取的比电容值高达330 F/g，能量密度值为45.8 Wh/kg。石墨烯-碳纳米管混合纳米结构对于包括超级电容器、燃料电池和电池在内的应用具有吸引力。
