In situ growth MoS2/NiS composites on Ni foam as electrode materials for supercapacitors. (March 2023)

• Record Type: Journal Article
• Authors: Wang, Hongyan; Tian, Lecheng; Zhao, Xin; Ali, Maryum; Yin, Kui; Xing, Zhicai
• Is Part Of: Materials today communications. Volume 34(2023)
• Publication Date: 2023-03
• Subjects: MoS2 -- NiS -- SILAR -- Symmetric supercapacitor; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2022.105041
• Languages: English
• ISSNs: 2352-4928

Abstract

Abstract: A binder-free MoS2 /NiS composite was in-situ grown on Ni foam using electrochemical deposition and successive ionic layer adsorption and reaction (SILAR) method. Studies were then conducted on the effects of the deposition cycles on the electrochemical performance. Use of Ni foam as a substrate during the preparative process reduced the opportunity for NiS and MoS2 aggregation at the interface. Also constructing a binder-free electrode can make the ion transfer faster, thus improving the electrochemical performance. In a three-electrode system, the MoS2 /NiS composites delivered an areal specific capacitance of 721.43 mF/cm 2 at a current density of 1 mA/cm 2 . The capacitance retention of MoS2 /NiS composites was up to 91.3% after 1000 cycles, displaying good stability. Moreover, aqueous symmetric supercapacitor system based on MoS2 /NiS composites was also tested, and it displayed areal specific capacitance of 216 mF/cm 2 with a maximum energy density of 30 µWh/cm 2 and a maximum power density of 3500 µW/cm 2 at 3 mA/cm 2 . These results demonstrate that MoS2 /NiS electrodes have broad application prospects as energy storage electrode materials. Graphical Abstract: A binder-free MoS2 /NiS composite was in-situ grown on Ni foam by using electrochemical deposition and successive ionic layer adsorption and reaction (SILAR). A symmetric supercapacitor has been successfully constructed in 1.0 M Na2 SO4 using MoS2 /NiS composites as anode and cathode, which exhibited an energy density of 30 µWh/cm 2 at a power density of 1500 µW/cm 2 . ga1 Highlights: A binder-free MoS2 /NiS-7 C composite was successfully prepared by electrochemical deposition and SILAR. MoS2 /NiS-7 C composite exhibits good cycling stability (91.3% for 1000 cycles). MoS2 /NiS-7 C // MoS2 /NiS-7 C device exhibits a high energy density of 30 µWh/cm 2 at 3500 µW/cm 2 power density. The aqueous symmetric supercapacitor was successfully constructed to power the LED.