On the Electrolytic Stability of Iron-Nickel Oxides

Abstract

The compositions of iron-nickel oxy/hydroxide oxygen evolution reaction (OER) catalysts were investigated before and after electrolysis at different current densities and pH values. Chronopotentiometric measurements showed nominal changes in electrochemical activity, but the physical analysis showed a dramatic change in iron content at both the anode and cathode. These experiments highlight the challenges that need to be solved before these types of films can be used on a commercial scale.

The formation of (NiFe)S2 pyrite mesocrystals as efficient pre-catalysts for water oxidation

“…It’s worth mentioning that currently there are two directions in which to explore the OER. One is to design industrially applicable catalyst systems constructed on conducting substrates, and a very large current density 31 of about several hundred mA cm –2 (normalized by the geometry area) and a high concentration of alkaline solution 32 , 33 are recommended. Another is to investigate the catalytic mechanisms of the OER.…”

Formation of unexpectedly active Ni–Fe oxygen evolution electrocatalysts by physically mixing Ni and Fe oxyhydroxides

“…Dissolution of Fe has been reported before in Ni-Fe catalysts; however, not to this extent. 40,41 Despite this, we noticed a steady increase in activity during the characterization along with an anodic peak shift (Fig. S6, ESI †).…”

Ultrathin Amorphous Iron–Nickel Boride Nanosheets for Highly Efficient Electrocatalytic Oxygen Production

“…[9a, 12] Severals trategies have been reported to enhancet he electroactivity,s uch as nanostructure synthesis, metal or non-metal doping, andh ybrid catalyst synthesis with active material on highly conductive substrates, such as nickel foam, which can be applied to metal boride-based catalysts as well. [16] Though their application on an industrial scale is still highly attractive, iron-nickel oxidess uffer from iron leachingo ver time at higheri ndustrial-scale currentd ensity, [17] and hence,i ronnickel bimetallic metalloids are also being explored. It may result in robusto xygen-evolving catalysts due to the synergistic effect betweena ne lectrocatalysta nd ah ighly conductive substrate, which allows for a uniform growth of nanostructures with large surface areas, a greater surface roughness leading to an increase in the number of active sites, hence ag reater wettability,a nd eliminates the agglomeration of nanoparticles, which causes aggregation of actives ites in the metal boride nanoparticles.…”

“…From these perspectives, iron-nickel bimetallic catalysts are the most explored oxygen-evolving electrocatalytic materials due to the advanced catalytic properties and stability. [16] Though their application on an industrial scale is still highly attractive, iron-nickel oxidess uffer from iron leachingo ver time at higheri ndustrial-scale currentd ensity, [17] and hence,i ronnickel bimetallic metalloids are also being explored. In this regard, ab imetallic catalystc ombined with non-metallice lements to form selenides, [18] sulfides, [19] nitrides, [20] and phosphides [21] paves the way to synthesize numerous materials with different morphologies and structures,a nd facilitates synergistic effectsb etween iron and nickeld ue to efficient electrontransfer properties within thesen anostructures.…”