三维网络结构NiCo2S4@NiCo2O4复合电极的制备及其性能

超级电容器具有更大的功率密度、优秀的循环稳定性、极快的充放电速度、超长的循环寿命以及环境友好等突出特点,其性能与构件关系密切,其中最根本的就是组成它的电极材料。本研究主要采用传统的水热法制备出钴酸镍(NiCo₂O₄)电极材料,进而通过离子交换(二次水热)制得镍钴硫(NiCo₂S₄),最后利用化学浴沉积(CBD)法使其与钴酸镍复合,得到最终所需的三维网络结构NiCo₂S₄@NiCo₂O₄复合电极。经过表面形貌表征、循环伏安测试、恒电流充放电测试以及比电容计算分析等可以证明:三维网络结构NiCo₂S₄@NiCo₂O₄复合电极的比电容及循环稳定性等远远优于复合前单一的纯NiCo₂O₄电极材料,具有极大应用前景。

Preparation and Characterization of NiCo2S4@NiCo2O4 Composite Electrode with 3D Network Structure

Supercapacitors with outstanding power density, excellent cycle stability, extremely fast rate performance and environmental friendliness have been widely studied. The performance of supercapacitors is highly dependent on the electrode materials. In this study, Ni-Co-S system was selected and composited as electrode material. Firstly, the NiCo₂O₄ electrode was prepared by hydrothermal method, and it was then transformed into NiCo₂S₄ electrode by ion exchanging method. Then, with chemical bath deposition (CBD) method, the NiCo₂S₄@NiCo₂O₄ composite electrode with 3D network structure was obtained. Further electrochemical studies (CV/Charge-Discharge curves) and SEM images confirm the better specific capacitance and cycle stability of NiCo₂S₄@NiCo₂O₄ composite electrode than that of the single component NiCo₂O₄ electrode, showing great application prospect.