The role of iron in the prevention of nickel electrode deactivation in alkaline electrolysis

Mauer, Anne E.; Kirk, Donald W.; Thorpe, Steven J.

doi:10.1016/j.electacta.2006.10.037

Cited by 67 publications

(54 citation statements)

References 17 publications

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“…32 Literature has shown that alloying Ni with other 3d TM elements helps to prevent the formation of Ni-hydride and increases the durability of the electrode. 33 Furthermore, Zhuang et al 25 have theorized that decorating the Ni surface with Cr-oxide alters the electronic density of states of the Ni d-band in such a way to decrease the Ni–O bonding while retaining the Ni–H bond affinity. In addition, Jaksic has written extensively on the volcano plots for hydrogen binding energy and HER activity of numerous PGM and TM catalysts.…”

Section: Resultsmentioning

confidence: 99%

Composite Ni/NiO-Cr₂O₃ Catalyst for Alkaline Hydrogen Evolution Reaction

et al. 2015

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We report a Ni–Cr/C electrocatalyst with unprecedented mass-activity for the hydrogen evolution reaction (HER) in alkaline electrolyte. The HER kinetics of numerous binary and ternary Ni-alloys and composite Ni/metal-oxide/C samples were evaluated in aqueous 0.1 M KOH electrolyte. The highest HER mass-activity was observed for Ni–Cr materials which exhibit metallic Ni as well as NiOx and Cr2O3 phases as determined by X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS) analysis. The onset of the HER is significantly improved compared to numerous binary and ternary Ni-alloys, including Ni–Mo materials. It is likely that at adjacent Ni/NiOx sites, the oxide acts as a sink for OHads, while the metallic Ni acts as a sink for the Hads intermediate of the HER, thus minimizing the high activation energy of hydrogen evolution via water reduction. This is confirmed by in situ XAS studies that show that the synergistic HER enhancement is due to NiOx content and that the Cr2O3 appears to stabilize the composite NiOx component under HER conditions (where NiOx would typically be reduced to metallic Ni0). Furthermore, in contrast to Pt, the Ni(Ox)/Cr2O3 catalyst appears resistant to poisoning by the anion exchange ionomer (AEI), a serious consideration when applied to an anionic polymer electrolyte interface. Furthermore, we report a detailed model of the double layer interface which helps explain the observed ensemble effect in the presence of AEI.

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Section: Resultsmentioning

confidence: 99%

Composite Ni/NiO-Cr₂O₃ Catalyst for Alkaline Hydrogen Evolution Reaction

et al. 2015

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“…Ni-based alloys have then started to be the object of extensive research efforts. [39][40][41] These progresses motivated commercialization of water electrolyzers. The first records of commercial water electrolysis date back to 1900, when the technique was still in its early life.…”

Section: Historical Backgroundmentioning

confidence: 99%

“…Iron coatings are known to inhibit the formation of the Ni hydride phase and hence prevent electrode deactivation. 39 Dissolved vanadium species have the ability to activate Ni cathodes during hydrogen evolution in alkaline media. 155 Electrode materials affect the activation energy of the electrochemical reaction.…”

Section: Future Trendsmentioning

confidence: 99%

Hydrogen production by alkaline water electrolysis

Santos¹,

Sequeira²,

Figueiredo³

2013

Quím. Nova

391

226

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Recebido em 13/12/12; aceito em 28/5/13; publicado na web em 17/7/13Water electrolysis is one of the simplest methods used for hydrogen production. It has the advantage of being able to produce hydrogen using only renewable energy. To expand the use of water electrolysis, it is mandatory to reduce energy consumption, cost, and maintenance of current electrolyzers, and, on the other hand, to increase their efficiency, durability, and safety. In this study, modern technologies for hydrogen production by water electrolysis have been investigated. In this article, the electrochemical fundamentals of alkaline water electrolysis are explained and the main process constraints (e.g., electrical, reaction, and transport) are analyzed. The historical background of water electrolysis is described, different technologies are compared, and main research needs for the development of water electrolysis technologies are discussed.

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“…The mechanism of nickel electrode deactivation is the formation of a nickel hydride phase at the electrode surface due to high hydrogen concentration. Iron coating can prevent the nickel hydride phase from forming and hence prevent the electrode deactivation [65]. Dissolved vanadium species are also found to activate nickel cathodes during hydrogen evolution in the alkaline media [40].…”

Section: Electrodesmentioning

confidence: 99%