Core–Shell Electrode Material Co₉S₈@Ni(OH)₂ for High-Performance Supercapacitors

Abstract

Developing electrodes with hybrid architectures holds significant importance in enhancing the efficiency of energy storage and conversion processes. In general, single-component metal oxides tend to exhibit poor operational stability and sluggish ionic-electron mobility. To address these issues, we have successfully synthesized a hybrid-structured material, Co 8 S 9 @Ni(OH) 2 , leveraging the easily modifiable characteristics of spinel-structured Co 8 S 9 . This hybrid material was prepared through a hydrothermal synthesis method. The resulting Co 8 S 9 @Ni(OH) 2 hybrid structure demonstrates an impressive specific capacitance of 1029 C g −1 at 1 A g −1 , accompanied by outstanding stability. In addition, the as-prepared samples shows a capacitance retention of 81.09% initial capacitance, indicating that the as-prepared sample possess an excellent cycle stability.