Abstract We propose a facile route to fabricate carbon nanotube-activated carbon composite electrodes for supercapacitor applications. The crux of our approach lies in the use of softened pitch that becomes viscous at 110 °C and combines effortlessly with multi-walled carbon nanotubes, allowing a one-pot chemical activation at 900 °C. Meso/macroscale pores created by a bundle of the nanotubes can be infiltrated effectively by the softened pitch, increasing the apparent tap density with microporosity. This composite electrode leverages the high electron conductivity of percolated multi-walled carbon nanotubes and the large surface area of activated carbon, leading to high gravimetric (11.9 Wh/kg) and volumetric energy densities (10.4 Wh/L) at 1 mA/cm2. Our method substantially simplifies the preparation of carbon nanotube-activated carbon composite materials and can be an excellent strategy to obtain practical energy storage properties at a reduced processing cost.

中文翻译：

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通过在软化点将 CNT 包埋到由沥青衍生的碳基体中，轻松制备超级电容器的复合电极

摘要 我们提出了一种简便的方法来制造用于超级电容器应用的碳纳米管-活性炭复合电极。我们方法的关键在于使用软化的沥青，该沥青在 110 °C 时变得粘稠，并且可以毫不费力地与多壁碳纳米管结合，从而在 900 °C 下进行一锅化学活化。由一束纳米管产生的中/大孔可以被软化的沥青有效地渗透，通过微孔增加表观振实密度。这种复合电极利用渗透多壁碳纳米管的高电子电导率和活性炭的大表面积，在 1 mA/cm2 时产生高重量 (11.9 Wh/kg) 和体积能量密度 (10.4 Wh/L)。