静电纺丝法制备的钴酸镍微米带的磁性以及电化学性能

通过直接退火静电纺丝前驱样品以及调节升温速率最终得到了钴酸镍(NiCo₂O₄)微米带. 通过X射线衍射、扫描电镜、振动样品磁强计以及电化学工作站等分析手段对钴酸镍微米带的晶体结构、形貌、磁学性能以及电化学性能进行了研究. 结果显示, 以1℃·min^-1的升温速率得到的NiCo₂O₄微米带属于立方尖晶石结构, 高温处理后仍能保持一维结构. 室温磁化结果显示制备的NiCo₂O₄微米带具有超顺磁性, 在10 kOe时磁化强度为6.35 emu·g^-1. 此外, 电化学测试结果显示, NiCo₂O₄微米带的电容特性是典型的赝电容, 并且比电容随着放电电流密度的增加而减小.

Magnetic and Electrochemical Properties of NiCo2O4 Microbelts Fabricated by Electrospinning

Cobaltate nickel (NiCo₂O₄) microbelts were fabricated by direct calcination of electrospun precursor samples with an appropriate heating rate. The crystal structure, morphology, magnetic properties, and electrochemical properties of the NiCo₂O₄ microbelts were investigated by X-ray diffraction, scanning electron microscopy, vibrating sample magnetometry, and electrochemical analysis. The results showed that a heating rate of 1℃·min^-1 resulted in the formation of cubic spinel NiCo₂O₄ microbelts. After calcination at high temperatures, the microbelts retained their one-dimensional structure. Magnetization results indicated that the NiCo₂O₄ microbelts were superparamagnetic and their magnetization value at 10 kOe was 6.35 emu·g^-1. Moreover, the electrochemical results suggest that the capacitance of the NiCo₂O₄ microbelts is typical pseudocapacitive capacitance, and the value of the specific capacitance gradually decreases with increasing discharge current density.