Adsorption of borate ions on passive iron: An in-situ SNIFTIRS-FTIRRAS study

Scharifker, B.R.; Habib, M. A.; Carbajal, J. L.; Bockris, J. O'm.

doi:10.1016/0039-6028(86)90109-3

Cited by 14 publications

(12 citation statements)

References 10 publications

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“…A broad XPS peak for boron centered around a binding energy of 192.5 eV (not shown) suggests that the boron is in the oxidized form, possibly a mixture of borax and boric acid from the electrolyte . A similar boron XPS signal was obtained for the sample emersed at +0.9 V. Seo 11 and Scharifker, using ex-situ AES and XPS, respectively, have also reported the detection of boron in surface films grown on iron. Therefore, the borate we observe may be adsorbed on the surface of the oxide or incorporated during the cycling process, but is not likely to be an artifact created by faulty rinsing procedure.…”

Section: Resultssupporting

confidence: 64%

“…Corrosion and passivation of iron and its alloys have been studied extensively. − However, in spite of the numerous studies published, a great deal remains to be understood about these processes. There is no clear consensus on the nature of the passive film formed on iron in borate media, especially regarding the hydroxylation or lack thereof of these films. ,− The effect of surface morphology of iron on the electrochemical behavior has been to the best of our knowledge largely unexplored after some early reports by Wieckowski …”

Section: Introductionmentioning

confidence: 99%

“…24 However, the same study shows that this thin oxide film does not obscure the effects of emersing the electrode at more noble potentials, i.e., electrodes subjected to various electrochemical experiments and emersed at more noble potentials show different Auger spectra and depth profiles. 24 Other reports in the litera-Langmuir 1997, 13, 3219-3225 S0743-7463(96)00897-9 CCC: $14.00 © 1997 American Chemical Society ture where UHV techniques like X-ray photoelectron spectroscopy (XPS) [26][27][28] and secondary ion mass spectrometry (SIMS) 14,15,29,30 were utilized involved exposure to air during transfer from the electrochemical cell and/or considerable time lapse between insertion of the sample into the UHV chamber and surface analysis.…”

Section: Introductionmentioning

confidence: 99%

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Combined UHV-Electrochemical Study of Polycrystalline Iron Electrodes in Borate and Sulfate Media

et al. 1997

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The passivation and corrosion of polycrystalline iron have been investigated using combined ultrahigh vacuum/electrochemical methods (UHV-EC) in borate electrolytes with and without sulfate contamination under a variety of experimental conditions. The presence of sulfate ions leads to enhanced anodic dissolution of iron under all circumstances, along with an increased hydroxylation of the surface film. Pitting of the iron surface is also observed. We report an unexpected effect: exposure of the electrode surface to sulfate solution significantly retards subsequent passivation in borate solution. This inhibition is observed even if the sulfate exposed sample is cleaned to the atomic level in UHV, prior to immersion in borate. This retardation manifests itself by way of a systematic trend toward higher potentials for the active−passive transition and the observation of increased anodic currents in the passive region. We attribute this effect to changes in surface morphology brought about by pitting of iron in sulfate solutions.

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Section: Resultssupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Combined UHV-Electrochemical Study of Polycrystalline Iron Electrodes in Borate and Sulfate Media

et al. 1997

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“…From the pioneer work and of Bockris [23,24], the importance of including in situ spectroelectrochemical methodologies as complementary tools for the investigation of inhibitor adsorption has also been shown.…”

Section: Introductionmentioning

confidence: 99%

“…The influence of benzoate concentration, pH, and dissolved oxygen on the corrosion of pure annealed iron was studied, employing sodium benzoate solutions [24,25,32]. The inhibition effect of benzoate was attributed to the blocking of surface sites in the anodic dissolution by the inhibitor molecule.…”

Section: Introductionmentioning

confidence: 99%

Inhibition of steel corrosion by calcium benzoate adsorption in nitrate solutions: theoretical and experimental approaches

Blustein

Zinola

2004

Journal of Colloid and Interface Science

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High Current Density Oxygen Evolution in Carbonate Buffered Solution Achieved by Active Site Densification and Electrolyte Engineering

et al. 2022

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High current density reaching 1 A cm À 2 for efficient oxygen evolution reaction (OER) was demonstrated by interactively optimizing electrolyte and electrode at non-extreme pH levels. Careful electrolyte assessment revealed that the state-of-the-art nickel-iron oxide electrocatalyst in alkaline solution maintained its high OER performance with a small Tafel slope in Kcarbonate solution at pH 10.5 at 353 K. The OER performance was improved when Cu or Au was introduced into the FeO xmodified nanostructured Ni electrode as the third element during the preparation of electrode by electrodeposition. The resultant OER achieved 1 A cm À 2 at 1.53 V vs. reversible hydrogen electrode (RHE) stably for 90 h, comparable to those in extreme alkaline conditions. Constant Tafel slopes, apparent activation energy, and the same signatures from operando Xray absorption spectroscopy among these samples suggested that this improvement seems solely correlated with enhanced electrochemical surface area caused by adding the third element.

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Adsorption of borate ions on passive iron: An in-situ SNIFTIRS-FTIRRAS study

Cited by 14 publications

References 10 publications

Combined UHV-Electrochemical Study of Polycrystalline Iron Electrodes in Borate and Sulfate Media

Combined UHV-Electrochemical Study of Polycrystalline Iron Electrodes in Borate and Sulfate Media

Inhibition of steel corrosion by calcium benzoate adsorption in nitrate solutions: theoretical and experimental approaches

High Current Density Oxygen Evolution in Carbonate Buffered Solution Achieved by Active Site Densification and Electrolyte Engineering

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