Symmetric Supercapacitors with layer-by-layer Molybdenum disulfide-reduced graphene oxide structures and poly(3,4-ethylenedioxythiophene) nanoparticles nanohybrid electrode

Fabrication of electrode material with stable cycling performances, enhanced surface area, improved electrode/ electrolyte interactions and interfaces is expected in order to reach supercapacitor goal and worth exploring for ternary nanocomposites of PEDOT nanoparticles (PEDOTNP) with 2D-2D MoS2-rGO heterostructures. Herein, layer-by-layer structures of MoS2-rGO have been prepared availing the opposite surface charges of GO nano sheets and MoS2 nanosheets (self-assembly method) followed by reduction, confirmation of which have been understood from the co-existence of MoS2 layers and rGO layers at hetero-interfaces from HR-TEM analysis. Ternary MoS2-rGO/PEDOTNP based nanocomposites were fabricated by in-situ reduction of GO in presence of pre-synthesized PEDOTNP. Mesoporous and hydrophilic ternary MoS2-rGO/PEDOTNP/NF electrode exhibits specific capacitance of 1143.7 F g(-1) at 1-fold of current density and retains 73.3% (840 F g(-1)) of capacitance at 9-fold of current density with 97.7% of cycle life after repeated 3000 GCD cycles. MoS2-rGO/PEDOTNP // MoS2-rGO/PEDOTNP symmetric supercapacitor (SSC) delivers specific capacitance of 289.25 F g(-1) at 1-fold of current density, 49% of rate capability at 20-fold of current density, and excellent cycling stability of 93.17% after 10,000 GCD cycles at 20-fold of current density. Moreover, MoS2-rGO/PEDOTNP // MoS2-rGO/PEDOTNP SSC exhibits specific energy of 33.56 W h kg(-1) at specific power of 450.03 W kg(-1) based on the total mass at 1-fold of current density.

Automated summary

By utilizing PEDOT nanoparticles in combination with MoS2-rGO heterostructures, electrode materials with stable cycling performances, enhanced surface area, and improved electrode/electrolyte interactions and interfaces can be fabricated. These ternary nanocomposites exhibit high specific capacitance at 1-fold current density, good rate capability at high current densities, and excellent cycling stability after numerous GCD cycles. Additionally, the symmetric supercapacitor based on these materials shows promising specific energy and power performance at different current densities.