The composites of Fe₂O₃ nanoparticles and carbon nanotubes (CNTs) can be applied in many fields including energy storage. The synthesis of Fe₂O₃/CNTs composite is usually carried out under high temperatures with complicated processes. To solve these problems, we report a novel one-step chemical bath deposition method to synthesize it at a very low temperature in this work. With DMF as a complex agent, ferrous cations can be well combined with the external surface of CNTs to form small Fe₂O₃ nanoparticles just at 70 °C for 2-h reaction. XRD, SEM, and TEM analyses confirm that as-prepared Fe₂O₃ nanoparticles are ultra-small, well crystallized, and highly dispersed onto the surface of CNTs. When being used as an electrode material for supercapacitor, the composite has a specific capacitance of 942 F g⁻¹ at 2 A g⁻¹ and 645 F g⁻¹ at 15 A g⁻¹, exhibiting a higher specific capacitance than previously reported Fe₂O₃/CNTs composites due to its smaller size.

Graphical abstract

Fe ₂ O ₃纳米颗粒和碳纳米管（CNT）的复合材料可应用于包括能量存储在内的许多领域。Fe ₂ O ₃ / CNTs复合材料的合成通常在高温下以复杂的过程进行。为了解决这些问题，我们报告了一种新颖的单步化学浴沉积方法，可以在非常低的温度下将其合成。使用DMF作为络合剂，亚铁阳离子可以很好地与CNT的外表面结合，在70°C的温度下进行2小时反应即可形成小的Fe ₂ O ₃纳米颗粒。XRD，SEM和TEM分析证实了所制备的Fe ₂ O ₃纳米粒子超小，结晶良好，并高度分散在CNT的表面上。当用作超级电容器的电极材料时，该复合材料在2 A g ^-1下具有942 F g ^-1的比电容，在15 A g ^-1下具有645 F g ^-1的比电容，比以前报道的Fe具有更高的比电容。₂ O ₃ / CNTs复合材料由于其较小的尺寸。

图形概要