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


Çetin A. , Önal A. M. , Esenturk E.

Journal of Materials Research, cilt.34, ss.3231-3239, 2019 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 34
  • Basım Tarihi: 2019
  • Doi Numarası: 10.1557/jmr.2019.215
  • Dergi Adı: Journal of Materials Research
  • Sayfa Sayıları: ss.3231-3239

Özet

The development of stable and effective earth-abundant metal oxide electrocatalysts is very crucial to improve

competence of water electrolysis. In this study, iron manganite (FeMnO3) nanomaterials were synthesized as an

affordable electrocatalyst for water oxidation reactions. The structural and chemical properties of FeMnO3

nanomaterials were studied by transmission electron microscopy, scanning electron microscopy, energydispersive

X-ray, X-ray diffraction, X-ray photoelectron spectroscopy, inductively coupled plasma-optical

emission spectrometry, and Brunauer–Emmett–Teller analyses. The microscopy analyses show that the

synthesized material has wire morphology, and assembly of approximately 70 nm nanocrystallites forms the

wires. XRD patterns confirmed the bixbyite structure of FeMnO3. The potential utility of the synthesized FeMnO3

nanowires (NWs) as an electrocatalyst for oxygen evolution reaction (OER) was investigated in alkaline medium.

The FeMnO3 NW modified fluorinated tin oxide (FTO) electrodes demonstrated promising OER activity with

onset potential of 1.60 V versus reversible hydrogen electrode and overpotential of 600 mV at 10 mA/cm2

catalytic current density. FeMnO3 NW modified FTO electrode was also observed to be stable during long-term

constant potential electrolysis. Therefore, this new material can be considered as a cost-effective alternative to

noble metal electrocatalysts for water oxidation and other possible catalytic reactions.