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, Co8S9@Ni(OH)2, leveraging the easily modifiable characteristics of spinel-structured Co8S9. This hybrid material was prepared through a hydrothermal synthesis method. The resulting Co8S9@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.