The magnetite Fe₃O₄ nanoparticles were synthesized via the hydrothermal process in the presence of sodium dodecyl sulfate (SDS) and cetyltrimethylammonium bromide (CTAB) as surfactants. The obtained products were characterized by X-ray powder diffraction, transmission electron microscopy, and ultraviolet-visible absorption spectroscopy. The electrochemical study of these products as advanced electrodes for supercapacitors was done using cyclic voltammetry (CV) and galvanostatic charge/discharge tests. The specific capacity values deduced from the cyclic voltammetry experiments were found to increase in the following order: Fe₃O₄/without surfactant (34 F g⁻¹) < Fe₃O₄/CTAB (44 F g⁻¹ < Fe₃O₄/SDS (63 F g⁻¹). The latter exhibited a specific discharge capacitance of 60 F g⁻¹ that remained stable after 500 charge/discharge cycles. The improved electrochemical performance of Fe₃O₄/SDS may be due to the particle size and shape effects. As a result of the enhanced electrochemical performance, Fe₃O₄/SDS hybrids could be regarded as a promising electrode for Li/Na-ion batteries and supercapacitors.

通过在十二烷基硫酸钠（SDS）和十六烷基三甲基溴化铵（CTAB）作为表面活性剂的存在下，通过水热法合成磁铁矿Fe ₃ O ₄纳米颗粒。通过X射线粉末衍射，透射电子显微镜和紫外-可见吸收光谱对所得产物进行表征。使用循环伏安法（CV）和恒电流充电/放电测试对这些产品作为超级电容器的高级电极进行了电化学研究。发现从循环伏安法实验推导的比容量值按以下顺序增加：Fe ₃ O ₄ /无表面活性剂（34 F g ^-1）<Fe ₃ O ₄/ CTAB（44 F g ^-1  <Fe ₃ O ₄ / SDS（63 F g ^-1）。后者的比放电电容为60 F g ^-1，经过500次充放电循环后保持稳定，电化学性能得到改善。 Fe ₃ O ₄ / SDS的混合可能是由于颗粒大小和形状效应所致，由于电化学性能的增强，Fe ₃ O ₄ / SDS杂化物被认为是锂/钠离子电池和超级电容器的有希望的电极。