Study on the Preparation of Nd–Doped Zinc Cobalt Oxide Porous Film and Its Electrochemical Properties

In this paper, ZnCo2O4(Nd–ZnCo2O4) films were prepared using a hydrothermal method and an electrodeposition method. We characterized the samples using X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The effect of Nd–ZnCo2O4 doping on the stability of the materials was studied. The results show that the Nd−ZnCo2O4 prepared in the experiment presents a porous network structure, no other impurity peaks and impurity elements exist, and the purity is high. In the experiment, the electrochemical properties of Nd−ZnCo2O4 were studied. When the current density is 3 A·g−1, the specific capacitance F·g−1 of the electrode is 1982 F·g−1. When the current density is changed 100 times, and every time it is changed back to 3 A·g−1, the specific capacitance F·g−1 is 1973 F·g−1, which is 99.5% of the initial specific capacitance F·g−1. 1982 F·g−1 indicates that Nd−ZnCo2O4 has good stability and can be reused many times. In the cycle stability performance test of Nd–ZnCo2O4//CNTs devices, when the current density is 3 A·g−1, the specific capacitance is 180 F·g−1. After 10,000 cycle charge discharge tests, the specific capacitance F·g−1 becomes 162 F·g−1, maintaining 90% of the initial specific capacitance. These results show that the electrode material has a long cycle life and good cycle stability.