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Catalysts 2018, 8(8), 328; https://doi.org/10.3390/catal8080328

NiFeOx as a Bifunctional Electrocatalyst for Oxygen Reduction (OR) and Evolution (OE) Reaction in Alkaline Media

1
Department of Chemical Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden
2
Material Physics, KTH Royal Institute of Technology, SCI, S-164 40 Kista, Sweden
3
Division of Physical Chemistry, Department of Chemistry, The Ångström Laboratory, Uppsala University, P.O. Box 523, SE-75120 Uppsala, Sweden
*
Author to whom correspondence should be addressed.
Received: 29 June 2018 / Revised: 31 July 2018 / Accepted: 8 August 2018 / Published: 10 August 2018
(This article belongs to the Section Electrocatalysis)
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Abstract

This article reports the two-step synthesis of NiFeOx nanomaterials and their characterization and bifunctional electrocatalytic activity measurements in alkaline electrolyte for metal-air batteries. The samples were mostly in layered double hydroxide at the initial temperature, but upon heat treatment, they were converted to NiFe2O4 phases. The electrochemical behaviour of the different samples was studied by linear sweep voltammetry and cyclic voltammetry on the glassy carbon electrode. The OER catalyst activity was observed for low mass loadings (0.125 mg cm−2), whereas high catalyst loading exhibited the best performance on the ORR side. The sample heat-treated at 250 °C delivered the highest bi-functional oxygen evolution and reduction reaction activity (OER/ORR) thanks to its thin-holey nanosheet-like structure with higher nickel oxidation state at 250 °C. This work further helps to develop low-cost electrocatalyst development for metal-air batteries. View Full-Text
Keywords: Bi-functional catalyst; hydrothermal synthesis; OER/ORR; nickel ferrite; Ni FeLDH Bi-functional catalyst; hydrothermal synthesis; OER/ORR; nickel ferrite; Ni FeLDH
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Paulraj, A.R.; Kiros, Y.; Göthelid, M.; Johansson, M.B. NiFeOx as a Bifunctional Electrocatalyst for Oxygen Reduction (OR) and Evolution (OE) Reaction in Alkaline Media. Catalysts 2018, 8, 328.

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