Complexity of Products of Tungsten Corrosion: Comparison of the 3D Pourbaix Diagrams with the Experimental Data

Nave, Maryana I.; Kornev, Konstantin G.

doi:10.1007/s11661-016-3888-6

Cited by 34 publications

(21 citation statements)

References 49 publications

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“…The Pourbaix diagram of tungsten oxide and related phases confirms that both solids (WO 2 and WO 3 ) exist from pH 0 to pH 7. [ 27 ] But under anodic potential and acidic conditions, even the oxides aggregate and form oligotungstates (e.g., W 12 O 39 6− and W 12 O 41 10− ) that are partially protonated (dependent on pH) and—more importantly—highly soluble in aqueous media. Morphologically, the structural moieties in the POM cluster are closely related to these soluble structures.…”

Section: Resultsmentioning

confidence: 99%

Stability evaluation of earth‐abundant metal‐based polyoxometalate electrocatalysts for oxygen evolution reaction towards industrial PEM electrolysis at high current densities

Vetter

Mauro

Reinisch

et al. 2021

Electrochemical Science Adv

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We investigated the cobalt polyoxometalate catalyst Ba8[Co9(H2O)6(OH)3(HPO4)2(PW9O34)3] in oxygen evolution reaction for large‐scale water electrolysis. The catalyst was characterized, yielding BET surfaces (8.37 m2/g), crystal water content (8.38%, 44 H2O), elemental analyses and single crystal structures (space group P1̅, a = 19.901(4) Å, b = 21.177(4) Å, c = 24.036(5) Å, α = 92.689(7)°, β = 108.73(7)°, γ = 117.137(6)°, Co9Na16O196.05P5W27, V = 8310(3) Å2 with z = 2; R2final = 0.001). The catalyst was integrated in an industrially applicable membrane electrode assembly and electrochemically characterized. Polarization studies revealed catalyst dissolution in situ, visible as a current density peak (32.2 mA/cm2, 2.2 V) with subsequent collapse (<5 mA/cm2). Galvanostatic experiments showed voltage increase from 2.5 to > 10 V at 10 mA/cm2 tracing back to acid‐mediated decomposition of the anionic POM oxide framework. We deduced insufficient thermodynamic as well as kinetic stability for industrial requirements in PEM water electrolysis.

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Section: Resultsmentioning

confidence: 99%

Stability evaluation of earth‐abundant metal‐based polyoxometalate electrocatalysts for oxygen evolution reaction towards industrial PEM electrolysis at high current densities

Vetter

Mauro

Reinisch

et al. 2021

Electrochemical Science Adv

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show abstract

“…The Pourbaix diagram of W at 10 −4 mol/l (= 18 mg/l) [Anik andOsseo-Asare, 2002, Nave andKornev, 2017] confirmed that solid metallic tungsten is not thermodynamically stable at pH > 6 and that WO 2− 4 soluble specie should form. Even if our experiments focussed on short duration, the amount of dissolved W reached high level, up to 100% in the case W_Plasma particles in Pulmonary medium after 48 h. The kinetic of dissolution in Saline medium was slower, but data extrapolation suggests that full dissolution could occur, after longer time (≈54/55 days).…”

Section: Chemical and Physical Stability Of W Particles In Tested Aqueous And Biological Mediamentioning

confidence: 87%

Oxidative transformation of Tungsten (W) nanoparticles potentially released in aqueous and biological media in case of Tokamak (nuclear fusion) Lost of Vacuum Accident (LOVA)

Sobrido¹,

Bernard²,

Angeletti³

et al. 2021

Comptes Rendus. Géoscience

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“…If E r could be attained for reactions depicted by Eqs. (11) or (12), then E r would be attained in Eq. (10).…”

Section: Impracticability Of Equilibrium Electrochemical Corrosion Potentialsmentioning

confidence: 99%

“…Pourbaix diagram could be used as a route to first principle corrosion simulation [11], a model for optimizing corrosiveness of a medium and designing materials with desired corrosion resistance. In a recent study, Nave and Kornev [12] constructed and applied 3D Pourbaix profile to establish the conditions for thermodynamic stability of tungsten-based compounds and describe the anodic dissolution of tungsten in aqueous solutions of potassium hydroxide. Beyond pure metals, Pourbaix profiles for multielement system such as Ni-Ti alloys having different ratios of the element have been proposed [13].…”

Section: Corrosion Tendency Based On Electrochemical Potentials and Phmentioning

confidence: 99%

Corrosion: Favoured, Yet Undesirable - Its Kinetics and Thermodynamics

Olasunkanmi¹

2022

Corrosion - Fundamentals and Protection Mechanisms

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This chapter describes the fundamentals of metal corrosion in relation to thermodynamics and kinetics. The chapter is so titled, because corrosion of metal is thermodynamically favourable. Moreover, it impacts negatively on economy and safety. Industries expend a substantial percentage of their budgets on corrosion control, and lose revenue due to corrosion damage. Effects of corrosion on industrial and public infrastructure cannot be overemphasized. Several accidents in the transportation and recreational industries have been linked to corrosion of metallic parts of respective gadgets. Some of these accidents are utterly catastrophic and fatal. Therefore, corrosion, albeit its thermodynamic favouability, is not desired by man. Metals corrode as a way of minimizing energy contents. Active metals are more stable in combined forms such as oxides, sulphides, and hydroxides, even though these forms are less useful to man. It appears the “price” to pay for extracting the pure forms of these metals from their ores is corrosion. This chapter presents fundamentals of thermodynamics and kinetics of metal corrosion, with emphasis on aqueous medium. It promises to serve as an introductory chapter for corrosion science students and as a concise material for tutors.

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Complexity of Products of Tungsten Corrosion: Comparison of the 3D Pourbaix Diagrams with the Experimental Data

Cited by 34 publications

References 49 publications

Stability evaluation of earth‐abundant metal‐based polyoxometalate electrocatalysts for oxygen evolution reaction towards industrial PEM electrolysis at high current densities

Stability evaluation of earth‐abundant metal‐based polyoxometalate electrocatalysts for oxygen evolution reaction towards industrial PEM electrolysis at high current densities

Oxidative transformation of Tungsten (W) nanoparticles potentially released in aqueous and biological media in case of Tokamak (nuclear fusion) Lost of Vacuum Accident (LOVA)

Corrosion: Favoured, Yet Undesirable - Its Kinetics and Thermodynamics

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