Design of NiCo₂O₄ nanoarray morphology for optimizing electrochemical stability of supercapacitor

Here, the hierarchical NiCo₂O₄ nanoarray grown on Ni foam with various morphologies is designed and synthesized for application in electrode of supercapacitor by a soft-template-assisted hydrothermal approach. The effect of NiCo₂O₄ nanoarray morphology on electrochemical performance of supercapacitor is investigated in detail. It is found that the NiCo₂O₄ hierarchical nanosheet/nanofiber array shows large area capacitance (8.6F cm⁻²) and good cycling stability (81.0%) after 3000 cycles. Moreover, a new machine learning method is developed to simulate and predict the effect of electrode material’s morphology on its electrochemical stability. Compared with experimental results, it exhibits high prediction accuracy with a small RMSE of 0.6595 and a large R² of 0.9099. This study provides a facile method to design morphology of electrode materials for optimizing electrochemical stability.