Fig. 6: The effect of gradient magnetic field, remanence, and demagnetization.
From: Spin-polarized oxygen evolution reaction under magnetic field
a Initial magnetization curve of CoFe2O4. b CA test in 1 M KOH under the different magnetic field strength (0, 500, 1000, 3000, 5000, 7500, and 10000 Oe) at a constant potential of 1.66 V versus RHE for CoFe2O4, Co3O4, and 1.56 V versus RHE for IrO2. c The increment of the current density under different magnetic field strength. It was calculated by the following equation: Increment (%) = (jM – jM=0)/jM=0; jM is the chronopotentiometry current density values obtained under the applied magnetic fields (0, 500, 1000, 3000, 5000, 7500, and 10000 Oe). The error bar represents three independent tests. d LSV curves of CoFe2O4 at a scan rate of 10 mV/s in O2-saturated 1 M KOH with and without a constant magnetic field (10,000 Oe), after the magnetic field removed (after M), and after demagnetization. The corresponding Tafel plots are shown in f. e The magnetization of CoFe2O4 after removing a constant magnetic field of 10,000 Oe. g The curve of demagnetization for CoFe2O4.
