We report a green and facile approach for the synthesis of NiFe₂O₄ (NF) nanoparticles with good crystallinity. The prepared materials are studied by various techniques in order to know their phase structure, crystallinity, morphology and elemental state. The BET analysis revealed a high surface area of 80.0 m²·g⁻¹ for NF possessing a high pore volume of 0.54 cm³·g⁻¹, also contributing to the amelioration of the electrochemical performance. The NF sample is studied for its application in supercapacitors in an aqueous 2 mol·L⁻¹ KOH electrolyte. Electrochemical properties are studied both in the three-electrode method and in a symmetrical supercapacitor cell. Results show a high specific capacitance of 478.0 F·g⁻¹ from the CV curve at an applied scan rate of 5 mV·s⁻¹ and 368.0 F·g⁻¹ from the GCD analysis at a current density of 1 A·g⁻¹ for the NF electrode. Further, the material exhibited an 88% retention of its specific capacitance after continuous 10000 cycles at a higher applied current density of 8 A·g⁻¹. These encouraging properties of NF nanoparticles suggest the practical applicability in high-performance supercapacitors.

我们报告了绿色和方便的方法，用于合成具有良好结晶度的NiFe ₂ O ₄（NF）纳米粒子。通过各种技术研究了制备的材料，以了解它们的相结构，结晶度，形态和元素状态。的BET分析表明的具有高表面积80.0米² ·^克-1为NF具有0.54厘米的高的孔体积³ ·^克-1，也有助于电化学性能的改善。研究了NF样品在2mol·L ^-1水溶液中在超级电容器中的应用KOH电解质。在三电极方法和对称超级电容器电池中都研究了电化学性质。结果显示478.0 F A高的比电容·克^-1从CV曲线在施加5毫伏的扫描速率·S ^-1和368.0·F·克^-1从在1个A·g的电流密度下的GCD分析^- NF电极为¹。此外，该材料在8 A·g ^-1的较高施加电流密度下连续10000次循环后，显示出其比电容的88％保留率。NF纳米颗粒的这些令人鼓舞的特性表明在高性能超级电容器中的实际适用性。