In Situ Growth of Two-Dimensional Crystalline/Amorphous NiO Heterojunction as an Excellent Electrode Material for Supercapacitors

NiO nanomaterials have been extensively employed as electrode materials for supercapacitors, owing to their economic viability and ease of fabrication. However, low energy density and poor cycling stability of NiO nanomaterials hinder their application in the energy storage field. Herein, two-dimensional crystalline/amorphous NiO/carbon cloth (2D NiO/CC) nanosheets have been synthesized via a facile hydrothermal and thermal treatment method. When used as electrode materials for supercapacitors, NiO/CC exhibits a specific capacitance of 121.82 F cm–2 at 1 mA cm–2, along with a Coulombic efficiency of nearly 100% and a remarkable capacity retention of 150.83% after 10,000 charging/discharging cycles. In conclusion, the present study not only offers insights into the study of NiO nanomaterials but also highlights their significant potential for energy storage applications.