Continuous Flow Vortex Fluidic Fabrication of Crumpled rGO/MoS2 Composites for Hydrogen Evolution Catalysis

High-yield crumpled reduced graphene oxide (rGO)/MoS2 composites were produced using continuous-flow processing in a vortex fluidic device (VFD) without surfactants or additional reagents. Intense shear within the dynamic thin film enabled rapid composite formation, generating uniform crumpled structures (0.7−3 μm) by simultaneously jet feeding DMF solutions of MoS2 and rGO into a 45° tilted rotating tube. The formation of the composite material aligns with established VFD topological flow models, where shear-induced desolvation and interfacial interactions along with high local pressures and temperatures drive sheet crumpling and assembly. This method is scalable, achieving conversion efficiencies of up to ∼95%. The resulting crumpled rGO/MoS2 structures show promising electrocatalytic activity for the hydrogen evolution reaction, achieving low overpotentials and a Tafel slope of 119 mV dec−1, highlighting their potential as cost-effective water-splitting catalysts.