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. Catalysts2018, 8, 328.
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.
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. Catalysts2018, 8, 328.
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.
Abstract
This article reports the two-step synthesis of NiFeOx nanomaterials, their characterisation 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.
Keywords
Bi-functional catalyst; hydrothermal synthesis; OER/ORR; nickel ferrite; Ni FeLDH
Subject
CHEMISTRY, Electrochemistry
Copyright:
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.
