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Nanowires assembled from iron manganite nanoparticles: Synthesis, characterization, and investigation of electrocatalytic properties for water oxidation reaction

<p>The development of stable and effective earth-abundant metal oxide electrocatalysts is very crucial to improve</p><p>competence of water electrolysis. In this study, iron manganite (FeMnO3) nanomaterials were synthesized as an</p><p>affordable electrocatalyst for water oxidation reactions. The structural and chemical properties of FeMnO3</p><p>nanomaterials were studied by transmission electron microscopy, scanning electron microscopy, energydispersive</p><p>X-ray, X-ray diffraction, X-ray photoelectron spectroscopy, inductively coupled plasma-optical</p><p>emission spectrometry, and Brunauer–Emmett–Teller analyses. The microscopy analyses show that the</p><p>synthesized material has wire morphology, and assembly of approximately 70 nm nanocrystallites forms the</p><p>wires. XRD patterns confirmed the bixbyite structure of FeMnO3. The potential utility of the synthesized FeMnO3</p><p>nanowires (NWs) as an electrocatalyst for oxygen evolution reaction (OER) was investigated in alkaline medium.</p><p>The FeMnO3 NW modified fluorinated tin oxide (FTO) electrodes demonstrated promising OER activity with</p><p>onset potential of 1.60 V versus reversible hydrogen electrode and overpotential of 600 mV at 10 mA/cm2</p><p>catalytic current density. FeMnO3 NW modified FTO electrode was also observed to be stable during long-term</p><p>constant potential electrolysis. Therefore, this new material can be considered as a cost-effective alternative to</p><p>noble metal electrocatalysts for water oxidation and other possible catalytic reactions.</p>