Performance degradation study of NiCoO-based asymmetric supercapacitors.

The performance of NiCoO//GO asymmetric supercapacitors was found to decline after many tests. It was found that the performance of the GO electrode was almost unchanged, while the performance of the NiCoO electrode declined rapidly. Therefore, porous spherical NiCoO nanoparticles were synthesized a simple hydrothermal method. A NiCoO//GO asymmetric supercapacitor was made, which can be charged and discharged 3000 times in the current density of 10 A g. The surface morphology, crystal structure and elemental composition were characterized by X-ray diffraction analysis, scanning electron microscopy and X-ray photoelectron spectroscopy. By comparing the surface morphology, crystal structure and elemental composition of the NiCoO electrode before and after the cycle, it was found that the performance of NiCoO electrode declines rapidly after the cycle due to the formation of new substances and the destruction of the crystal structure of NiCoO electrode. Therefore, maintaining the stability of the crystal structure of the electrode material is an important means to ensure the stability of the performance of the supercapacitor. It provides a meaningful strategy for studying the degradation of supercapacitor electrode materials.