Metallic MoS2 grown on porous g-C3N4 as an efficient electrode material for supercapattery application

Metallic (1T) molybdenum disulphide (MoS₂) is a promising electrode material in the electrochemical energy storage application due to its excellent electrical conductivity and ionic intercalation property. Here, we report the metallic MoS₂ modified with porous graphitic carbon nitride (g-C₃N₄) as a novel nanocomposite for efficient supercapattery electrode. The 1T-MoS₂ is grown on the surface of porous g-C₃N₄, and thus it facilitates easier ion intercalation between these two materials. The prepared electrode of g-C₃N₄/MoS₂ composite attained a maximum specific capacity of 515 C g⁻¹ at 1 A g⁻¹ current density and obtained 66% capacitive retention even at a high current density of 20 A g⁻¹ in three electrode cell. A symmetric cell is fabricated using g-C₃N₄/MoS₂ composite as both positive and negative electrodes to study the practical applicability of the electrode material. The cell exhibits an excellent performance with a maximum specific capacity of 198 C g⁻¹ at a current density of 1 A g⁻¹ and specific energy of 147 Wh kg⁻¹ at a power density of 2691 W kg⁻¹. This symmetric cell still delivers an energy density of 46 Wh kg⁻¹ at a power density as high as 26.74 kW kg⁻¹. Moreover, the cell exhibits extended cyclic stability with capacitive retention of 89% after 8000 cycles. This outstanding electrochemical performance suggests the future scope of g-C₃N₄/MoS₂ nanocomposite as an efficient electrode material for energy storage devices.