Synthesis and Characterization of Highly Uniform CuCo_2S_4 Ball-in-Ball Hollow Nanospheres as High Performance Electrode for Supercapacitors

摘要

Highly uniform and monodispersed CuCo_2S_4 ball-in-ball hollow nanospheres(HNSs) are successfully synthesized from CuCo-glycerate nanospheres (NSs)precursors via a facile two-step solvothermal process. The most influentialparameter in anion exchange reaction between glycerate and sulfur ion is thesolvothermal time, which plays a significant role in enhancing the structuraland electrochemical properties. Impressively, CuCo_2S_4 ball-in-ball HNSsobtained through a sulfurization reaction time of 18 h show high capacitance(442 F g~(-1) at current density of 0.5 A g~（-1）) and superior electrochemicalstability (84.5% at 5 A g~（-1） after 5000 cycles), which can realize highperformancematerials for supercapacitors.