Preprint Article Version 1 This version is not peer-reviewed

Electrochemical Synergies of Heterostructured Fe2O3-MnO Redox Couple for Oxygen Evolution Reaction in Alkaline Water Splitting

Version 1 : Received: 7 September 2019 / Approved: 8 September 2019 / Online: 8 September 2019 (16:16:26 CEST)

How to cite: Kim, J.; Heo, J.N.; Do, J.Y.; Chava, R.K.; Kang, M. Electrochemical Synergies of Heterostructured Fe2O3-MnO Redox Couple for Oxygen Evolution Reaction in Alkaline Water Splitting. Preprints 2019, 2019090087 (doi: 10.20944/preprints201909.0087.v1). Kim, J.; Heo, J.N.; Do, J.Y.; Chava, R.K.; Kang, M. Electrochemical Synergies of Heterostructured Fe2O3-MnO Redox Couple for Oxygen Evolution Reaction in Alkaline Water Splitting. Preprints 2019, 2019090087 (doi: 10.20944/preprints201909.0087.v1).

Abstract

For efficient electrode development in an electrolysis system, Fe2O3, MnO, and heterojunction Fe2O3-MnO materials were synthesized via a simple sol-gel method. These particles were coated on a Ni-foam electrode, and the resulting material was used as an electrode to be used during an oxygen evolution reaction (OER). A 1000-cycle OER test in a KOH alkaline electrolyte indicated that the heterojunction Fe2O3-MnO/NF electrode exhibited the most stable and highest OER activity: it exhibited a low overvoltage (n) of 370 mV and a small Tafel slope of 66 mV/dec. X-ray photoelectron spectroscopy indicated that the excellent redox performance contributed to the synergy of Mn and Fe, which enhanced the OER performance of the Fe2O3-MnO/NF electrode. Furthermore, the effective redox reaction of Mn and Fe indicated that the structure maintained stability even under 1000 repeated OER cycles.

Subject Areas

heterostructured Fe2O3-MnO; oxygen evolution reaction; alkaline water splitting; electrochemical synergy

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