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

Kim, Junyeong; Heo, Jun Neoung; Do, Jeong Yeon; Chava, Rama Krishna; Kang, Misook

doi:10.3390/nano9101486

Open AccessArticle

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

by

Junyeong Kim

,

Jun Neoung Heo

,

Jeong Yeon Do

^*

,

Rama Krishna Chava

and

Misook Kang

^*

Department of Chemistry, College of Natural Sciences, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Korea

^*

Authors to whom correspondence should be addressed.

Nanomaterials 2019, 9(10), 1486; https://doi.org/10.3390/nano9101486

Submission received: 7 September 2019 / Revised: 14 October 2019 / Accepted: 16 October 2019 / Published: 18 October 2019

(This article belongs to the Special Issue Nanostructured Catalysts for Sustainable Applications)

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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 (NF) 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.

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

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MDPI and ACS Style

Kim, J.; Heo, J.N.; Do, J.Y.; Chava, R.K.; Kang, M. Electrochemical Synergies of Heterostructured Fe₂O₃-MnO Catalyst for Oxygen Evolution Reaction in Alkaline Water Splitting. Nanomaterials 2019, 9, 1486. https://doi.org/10.3390/nano9101486

AMA Style

Kim J, Heo JN, Do JY, Chava RK, Kang M. Electrochemical Synergies of Heterostructured Fe₂O₃-MnO Catalyst for Oxygen Evolution Reaction in Alkaline Water Splitting. Nanomaterials. 2019; 9(10):1486. https://doi.org/10.3390/nano9101486

Chicago/Turabian Style

Kim, Junyeong, Jun Neoung Heo, Jeong Yeon Do, Rama Krishna Chava, and Misook Kang. 2019. "Electrochemical Synergies of Heterostructured Fe₂O₃-MnO Catalyst for Oxygen Evolution Reaction in Alkaline Water Splitting" Nanomaterials 9, no. 10: 1486. https://doi.org/10.3390/nano9101486

APA Style

Kim, J., Heo, J. N., Do, J. Y., Chava, R. K., & Kang, M. (2019). Electrochemical Synergies of Heterostructured Fe₂O₃-MnO Catalyst for Oxygen Evolution Reaction in Alkaline Water Splitting. Nanomaterials, 9(10), 1486. https://doi.org/10.3390/nano9101486

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

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