To store more energy in limited spaces, the volumetric performance of energy storage devices used in electric vehicles and portable electronics has attracted more research attention than their gravimetric performance. Herein, we describe the preparation of N/O co-doped single-walled carbon nanohorns (SWCNH) using chemical vapor deposition with pyridine followed by acid treatment to obtain a supercapacitor electrode material with high specific volumetric capacitance. The synthesized N/O co-doped SWCNH (N and O contents of 6.1 and 9.1 at%, respectively) electrode had a higher bulk density (1.05 g cm⁻³) than that of the pristine SWCNH electrode (0.86 g cm⁻³). Moreover, the N/O co-doped SWCNH supercapacitor electrode exhibited drastically increased specific volumetric, gravimetric, and areal capacitances (123 F cm⁻³, 117 F g⁻¹, and 91.4 μF cm⁻², respectively) in 1 M H₂SO₄ electrolyte, compared with those of a pristine SWCNH electrode (36 F cm⁻³, 42 F g⁻¹, and 11.4 μF cm⁻², respectively). The superior electrochemical performances are associated with enhanced pseudocapacitive contribution and high bulk density of electrode upon N/O co-doping. The simple method described herein for producing SWCNH electrodes with high bulk density and high specific volumetric capacitance should contribute to the development of supercapacitors with high volumetric performance.

为了在有限的空间中存储更多的能量，电动汽车和便携式电子设备中使用的能量存储设备的体积性能比其重力性能吸引了更多的研究关注。在这里，我们描述了使用吡啶化学气相沉积，然后进行酸处理，以制备具有高比容量电容的超级电容器电极材料，制备N / O共掺杂单壁碳纳米角（SWCNH）。合成的N / O共掺杂SWCNH电极（N和O含量分别为6.1和9.1 at％）具有比原始SWCNH电极（0.86 g cm ^-3）更高的堆密度（1.05 g cm ^-3）。）。另外，N / O共掺杂SWCNH超级电容器电极具有显着增加特定体积，重量，和分布区电容（123˚F厘米^-3，117 F G ^-1，和91.4μF厘米^-2分别）在1Mħ ₂ SO ₄电解质中，与一个原始SWCNH电极（36女性厘米相比^-3，42 F G ^-1，和11.4μF厘米^-2， 分别）。优异的电化学性能与N / O共掺杂时增强的伪电容作用和电极的高堆积密度有关。本文所述的用于生产具有高体积密度和高比容电容的SWCNH电极的简单方法应有助于开发具有高体积性能的超级电容器。