Three ferrites of type MFeO (where M is bivalent Fe, Co or Mn) dispersed on multi-walled carbon nanotubes (MWCNTs) were prepared by a coprecipitation method. Their electrocatalytic properties toward the reduction of HO at pH 7.4 were systematically compared. Catalytic reduction rates at an applied potential of −0.4 V (vs. Ag/AgCl) and pseudo Michaelis-Menten constants show the electrocatalytic ability to follows the order FeO > CoFeO > MnFeO. This diversity is attributed to the differences in the M(II) used and its occupancy on the lattice surface. The sensitivities are 120.98 ± 0.15, 48.45 ± 0.23 and 32.25 ± 0.27 μA cm mM, and the limits of detection are 0.98, 2.59 and 5.64 μM of HO (at an S/N ratio of 3). [Figure not available: see fulltext.] [ABSTRACT FROM AUTHOR]