H-M-CVD-Based Fabrication of Binder-Free Heterostructured Manganese–Copper–Sulfide Asymmetric Device: Supercapacitive Performance
摘要
Transition metal sulfides are a prevailing supercapacitive electrode material because of their redox activity, potentially addressing global energy demands while minimizing environmental pollution. Here, binder-free manganese copper sulfide (MnS-CuS) electrode material was synthesized via a low-cost homemade chemical vapor deposition (H-M-CVD) technique, which significantly decreased the synthesis time by providing high purity, uniform growth, reduced agglomeration, and superior electrochemical performance. X-ray diffraction verified the polycrystalline nature of the electrode material, along with the presence of microstrains and lattice defects that promote rapid charge diffusion. The MnS-CuS electrode material with high surface area (97.48 m2/g), mesoporous structure, and greater active sites enables efficient ion transport to enhance electrochemical performance. The MnS-CuS electrode material exhibited high values of specific capacitance (2011 F/g), energy density (34.5 Wh/kg), and power density (1296 W/kg). It retained 93% of its capacitance after 10,000 cycles with a coulombic efficiency of 97%. An asymmetric supercapacitor assembled with this electrode material achieved a specific capacitance of 929 F/g (at 1 A/g), energy density of 44 Wh/kg, and power density of 3189 W/kg, demonstrating that the synthesized MnS-CuS electrode material can be potentially used for sustainable energy storage systems.
Graphical abstract