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A simple and sensitive electrochemical sensor based on nano-ruthenium oxide/riboflavin modified glassy carbon (GC/RuOx/RF) electrode was constructed and utilized to determine H₂O₂. By immersing the GC/RuOx modified electrode into RF solution for a short period of time (5–70 s), a thin film of the proposed molecule was immobilized onto the electrode surface. The modified electrode showed stable and a well-defined redox couples at a wide pH range (1–10), with surface confined characteristics. Experimental results revealed that RF was adsorbed on the surface of RuOx nanoparticles (NPs) and in comparison to usual methods for the immobilization of RF, such as electropolymerization, the electrochemical reversibility and stability of this modified electrode has been improved. The heterogeneous electron transfer rate constant (k_s) and the surface coverage of immobilized RF on the GC/RuOx electrode was …