This negative redox potential suggests Fe III (acac) 3 as a potential candidate for anolyte in NARFB. Where, i is the limiting current on the disk, n is the number of electrons, F is the Faraday constant (96485 C mol -1 ), D is the diffusion coefficient, v is the kinematic viscosity (taken here as 4.27E -3 cm 2 /s), ω is the rotation rate (rad s -1 ), C is the bulk concentration electrolyte (taken here as 1E moles/L), and A is the disk area (GC-disk RRDE 0.1963 cm 2 and Pt-ring RRDE is 0.1642 cm 2 ).