Electrochemical Considerations Regarding General Corrosion of Materials in a BWR Primary Circuit

Hemmi, Yukio; Ichikawa, Nagayoshi; Saito, Nobuyoshi; Masuda, Takahisa

doi:10.1080/18811248.1994.9735277

Cited by 22 publications

(8 citation statements)

References 7 publications

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“…Ferrites are globally considered as being thermally and chemically stable in aqueous systems [45], and the Pourbaix diagrams indicate that most of the ferrites are stable in most of the alkaline or near-neutral media used in photoelectrochemical cells [9]. However, they are reported to suffer from corrosion in acidic media [51,52]. Independently of the crystallographic structure, the mono-or bi-substitution of the cations within the ferrite materials is known to affect many of their physico-chemical properties, among others, the resistivity (conductivity), the optical properties (reflectivity), the band-gap energy, the energy position of both valence and conduction bands, or the p/n-type behaviour [9].…”

Section: Ferrite Propertiesmentioning

confidence: 99%

Ferrite Materials for Photoassisted Environmental and Solar Fuels Applications

et al. 2019

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Ferrites are a large class of oxides containing Fe 3+ and at least another metal cation that have been investigated for and applied to a wide variety of fields ranging from mature technologies like circuitry, permanent magnets, magnetic recording and microwave devices to the most recent developments in areas like bioimaging, gas sensing, and photocatalysis. In the last respect, although ferrites have been less studied than other types of semiconductors, they present interesting properties such as visible light absorption, tuneable optoelectronic properties and high chemical and photochemical stability. The versatility of their chemical composition and of their crystallographic structure opened a playground for developing new catalysts with enhanced efficiency. This article reviews the recent development of the application of ferrites to photoassisted processes for environmental remediation and for the synthesis of solar fuels. Applications in the photocatalytic degradation of pollutants in water and air, photo-Fenton, and solar fuels production, via photocatalytic and photoelectrochemical water splitting and CO2 reduction, are reviewed paying special attention to the relationships between the physico-chemical characteristics of the ferrite materials and their photo-activated performance.

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Section: Ferrite Propertiesmentioning

confidence: 99%

Ferrite Materials for Photoassisted Environmental and Solar Fuels Applications

et al. 2019

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“…15 Considering the Pourbiax diagrams, most ferrites are stable in the alkaline or near neutral media in which most PEC investigations are carried out, however, they suffer from corrosion in acidic media. 30,31 Most of them are semiconductors with bandgap energies allowing the excitation by visible light and possess energetic positions of the conduction and the valence band suitable for either reduction of protons and/or oxidation of water (Fig. 3).…”

Section: Structural Properties Of Spinel Ferritesmentioning

confidence: 99%

Photoelectrochemical and theoretical investigations of spinel type ferrites (M_xFe_3−xO₄) for water splitting: a mini-review

et al. 2016

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Solar-assisted water splitting using photoelectrochemical cells (PECs) is one of the promising pathways for the production of hydrogen for renewable energy storage. The nature of the semiconductor material is the primary factor that controls the overall energy conversion efficiency. Finding semiconductor materials with appropriate semiconducting properties (stability, efficient charge separation and transport, abundant, visible light absorption) is still a challenge for developing materials for solar water splitting. Owing to the suitable bandgap for visible light harvesting and the abundance of iron-based oxide semiconductors, they are promising candidates for PECs and have received much research attention. Spinel ferrites are subclasses of iron oxides derived from the classical magnetite (Fe II Fe III 2 O 4) in which the Fe II is replaced by one (some cases two) additional divalent metals. They are generally denoted as M x Fe 3−x O 4 (M ¼ Ca, Mg, Zn, Co, Ni, Mn, and so on) and mostly crystallize in spinel or inverse spinel structures. In this mini review, we present the current state of research in spinel ferrites as photoelectrode materials for PECs application. Strategies to improve energy conversion efficiency (nanostructuring, surface modification, and heterostructuring) will be presented. Furthermore, theoretical findings related to the electronic structure, bandgap, and magnetic properties will be presented and compared with experimental results. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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“…Ni ≈ 2.510 − 25 cm 2 /s [15] is much smaller than in a spinel layer V NiCr2O4 Ni ≈ 310 − 18 cm 2 /s [22]. This suggests that a continuous Cr 2 O 3 layer could be an efficient means for mitigation of nickel release and motivates the development of a surface treatment aiming at substituting Cr 2 O 3 for the ordinary Ni-based spinels.…”

Section: At 285 • C the Diffusion Coefficient Of Ni In A Chromine Layer V Cr2o3mentioning

confidence: 99%

Laser surface melting of nickel-based alloy reduces nickel release in the primary cooling system of a nuclear power plant

Pacquentin

Gouton

Caron

et al. 2021

Optics & Laser Technology

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The surface of Ni-based alloy 690 was treated using a sub-microsecond pulsed laser in order to reduce the amount of nickel released when the surface is exposed to the primary cooling system of pressurized water nuclear reactors. A 2D array of laser treatment parameter sets was investigated. The results on sample surfaces was characterized using interferometric microscopy, Scanning Electron Microscopy (SEM), Glow Discharge Optical Emission Spectrometry (GDOES) and X-ray Photoelectron Spectrometry (XPS). The treatment leading to a continuous and defect-free chromine surface having the minimum nickel content over about the first two nanometers and no subsurface chromium depletion was selected for the nickel release test. This selection criterion proved to be very efficient as the total amount of nickel released in a standard qualification test using a simulated primary coolant was reduced, compared to a non-treated surface, by a factor of 7 during the heating phase and by a factor of 3.7 on average over the whole month-long test.

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Electrochemical Considerations Regarding General Corrosion of Materials in a BWR Primary Circuit

Cited by 22 publications

References 7 publications

Ferrite Materials for Photoassisted Environmental and Solar Fuels Applications

Ferrite Materials for Photoassisted Environmental and Solar Fuels Applications

Photoelectrochemical and theoretical investigations of spinel type ferrites (M_xFe_3−xO₄) for water splitting: a mini-review

Laser surface melting of nickel-based alloy reduces nickel release in the primary cooling system of a nuclear power plant

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Electrochemical Considerations Regarding General Corrosion of Materials in a BWR Primary Circuit

Cited by 22 publications

References 7 publications

Ferrite Materials for Photoassisted Environmental and Solar Fuels Applications

Ferrite Materials for Photoassisted Environmental and Solar Fuels Applications

Photoelectrochemical and theoretical investigations of spinel type ferrites (MxFe3−xO4) for water splitting: a mini-review

Laser surface melting of nickel-based alloy reduces nickel release in the primary cooling system of a nuclear power plant

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Photoelectrochemical and theoretical investigations of spinel type ferrites (M_xFe_3−xO₄) for water splitting: a mini-review