CoO@CoS/Ni3S2 hierarchical nanostructure arrays for high performance asymmetric supercapacitor

• DOI: 10.1016/j.apsusc.2020.147438
• Publication Date: 2020-08-03T15:01:15Z
• Authors: Yihong Zhang; Danyang Wang; Shiquan Lü; Yanli Chen; Hougang Fan; Maobin Wei; Lili Yang; William W. Yu; Xiangwei Meng
• Keywords: 01 natural sciences; 7. Clean energy; 0104 chemical sciences

Abstract CoO@CoS/Ni3S2 (CoO@Ni-Co-S) hierarchical nanostructure electrode materials are synthesized on nickel foam (NF) through hydrothermal process and electrodeposition. The three dimensional porous CoO@Ni-Co-S hierarchical nanostructure is formed through the interconnection between the CoO nanoneedles and the Ni-Co-S nanosheets. This structure is beneficial for the transport of electrolyte ions and electrons. The CoO@Ni-Co-S nanocomposite exhibits a specific capacitance of 2507 F g−1 at 1 A g−1 (which is superior to CoO@CoS electrode, 1855 F g−1 at 1 A g−1) and possesses a capacitance retention of 84.2% at 10 A g−1. Furthermore, an asymmetric supercapacitor with CoO@Ni-Co-S//activated carbon is assembled, and the energy density reaches 110.7 W h kg−1 when the power density is 880 W kg−1. The asymmetric supercapacitor also exhibits an excellent cyclic stability (84.3% capacitance retention over 10,000 cycles). Preliminary results demonstrate that CoO@Ni-Co-S is a promising material for energy storage.