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

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.

Trimetallic Mn‐Fe‐Ni Oxide Nanoparticles Supported on Multi‐Walled Carbon Nanotubes as High‐Performance Bifunctional ORR/OER Electrocatalyst in Alkaline Media

“…In our previous studies, the bimetallic catalyst Fe 0.3 Ni 0.7 O X /MWCNTS‐Ox was identified as a promising OER catalyst, achieving a current density of 10 mA cm −2 at a potential of as low as 1.55 V versus RHE . This value is comparable to the benchmark OER‐performance of iron‐containing nickel oxide‐based OER catalysts reported in the literature, including NiFeO X , NiFeB X , and NiFe layered double hydroxide (LDH) . In the present work, we used Fe 0.3 Ni 0.7 O X as an OER‐benchmark and incorporated MnO X with a twofold aim: first, to activate the composite for the ORR, and second, to explore potential synergistic interactions among the three transition metals which could lead to enhanced ORR and OER performances.…”

Investigation of NiFe-Based Catalysts for Oxygen Evolution in Anion-Exchange Membrane Electrolysis

“…%). All these phases have been shown to be active towards the oxygen evolution in alkaline solutions [39,[43][44][45][46][47][48][49][50]. Their combination may produce a synergistic effect towards the oxygen evolution reaction.…”

“…On the other hand, it has been largely demonstrated that a spinel phase is more performing compared the pure Ni oxide and Fe oxide [38,39].…”

Engineering Ternary Copper-Cobalt Sulfide Nanosheets as High-performance Electrocatalysts toward Oxygen Evolution Reaction

“…However, the semi-reaction in the process of water splitting, oxygen eVolution reaction (OER), is related to the continuous process of four proton-coupled electron transfer, which requires a higher overpotential at the anode and it therefore undergoes a sluggish reaction dynamics process [11][12][13]. As a consequence, it is particularly valuable for researchers to develop efficient and stable oxygen-evolving catalysts at present [14,15]. Particularly, some noble metal catalysts, including IrO 2 and RuO 2 , are deemed to the most efficient and robust electrocatalysts for water oxidation [16,17].…”