Iron–nickel oxide: a promising strategy for water oxidation†
Herein, a straightforward method is applied to fabricate an effective and stable Fe–Ni based electrode for water oxidation. According to this method, an Fe–Ni alloy is operated under a high potential, and the significant reconstruction of the surface makes the alloy an efficient and stable electrode for water oxidation. The prepared Fe–Ni based electrode is characterized via scanning electron microscopy, high-resolution transmission electron microscopy, X-ray diffraction, and energy-dispersive X-ray spectrometry. The electrode at pH = 13 indicates an overpotential of 195 mV for the onset of water oxidation. A current density of 1 mA cm−2 is also found at 210 mV overpotential. After 5 hours of amperometry at 695 mV overpotential, an increase in water oxidation from 33 to 39 mA cm−2 is found.