Nickel ferrite exhibits many advantages as electrode materials in the application of supercapacitor, such as high energy capacity and excellent cycle stability. Whereas, compared with identical-metal sulfides, the specific capacitance of NiFe₂O₄ is still insufficient. Hence, to combine the superiorities of oxides and sulfides, partial sulfur doping NiFe₂O₄ is obtained through hydrothermal synthesis method. Analyzed by Vienna Ab-initio Simulation Package (VASP) software and high-resolution transmission electron microscopy, the lattice parameters of NiFe₂O₄ are confirmed to be expanded by introducing sulfur atoms, which is beneficial to electrochemical performances. At a current density of 1 A/g, the specific capacitance of partial sulfur doping NiFe₂O₄ is calculated to be 284 F/g, higher than that of the original NiFe₂O₄ of 182.2 F/g. Moreover, a maximum energy density of 21.14 Wh/kg is achieved at a power density of 375 W/kg. This work shows that partial sulfur doping could improve the electrochemical performance of NiFe₂O₄. To sum up, this work provides an effective way to enhance the poor electrochemical performance of oxides, greatly encouraging the application of oxides in energy storage field.

镍铁氧体作为电极材料在超级电容器的应用中表现出许多优点，例如高能量容量和优异的循环稳定性。而与同种金属硫化物相比，NiFe ₂ O ₄的比电容仍然不足。因此，为了结合氧化物和硫化物的优点，采用水热合成法获得了部分硫掺杂的NiFe ₂ O _{4 。}通过Vienna Ab-initio Simulation Package (VASP)软件和高分辨率透射电子显微镜分析NiFe ₂ O _{4的晶格参数}被证实通过引入硫原子来扩展，这有利于电化学性能。在1 A/g的电流密度下，计算出部分硫掺杂NiFe ₂ O ₄的比电容为284 F/g，高于原NiFe ₂ O ₄的182.2 F/g。此外，在 375 W/kg 的功率密度下实现了 21.14 Wh/kg 的最大能量密度。这项工作表明，部分硫掺杂可以提高NiFe ₂ O ₄的电化学性能。综上所述，这项工作为增强氧化物较差的电化学性能提供了一种有效途径，极大地促进了氧化物在储能领域的应用。