One‐step synthesis of nano‐onion‐like NiCoMn‐LDHs for high‐performance supercapacitors

Abstract To enhance the electrochemical performance of NiMn‐LDHs electrode materials, this study explores metal Co doping and synthesizes nano‐onion‐like NiCoMn‐LDHs composites. By examining the effects of various heat treatment temperatures (100°C, 110°C, 120°C, 130°C, and 140°C), we identified that NiCoMn‐LDHs prepared at 130°C exhibited superior performance. The results reveal that Co doping significantly increases the specific capacitance compared with undoped NiMn‐LDHs. The 130°C NiCoMn‐LDHs achieved a specific capacitance of 4413 F g 1 at 1 A g −1 and maintained 3055 F g −1 at 10 A g −1 , demonstrating excellent rate performance. These findings highlight the benefits of Co doping and optimized heat treatment for improving NiMn‐LDHs in supercapacitor applications, providing a strong foundation for their use in high‐performance energy storage devices.