Deposition of Nickel and Cobalt Ions with Iron Crud on Heated Stainless Steel Surface under Nucleate Boiling Conditions.

Nishino, Yoshitaka; Asakura, Yamato; Sawa, Tsutomu; Uchida, Shunsuke; Ohsumi, Katsumi; Amano, Osamu; Suzuki, Nagao

doi:10.3327/jnst.28.848

Cited by 5 publications

(3 citation statements)

References 10 publications

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“…The location and identity of the interlayer ions are nonspecific, but conjugate bases of weak acids (e.g., F – , HPO 4 2- ) can mediate proton transfers in concert with electron-transfer reactions . The spatial extent of the layered structures is constrained by previously reported X-ray diffraction data, which indicate that the CoO x cf s do not exhibit long-range order and limit the size of any crystallites to dimensions of 10–100 Å. ,, Therefore, we propose that the amorphous bulk films are composed of an ensemble of polydisperse and oligomeric, yet layered, cobaltate structures …”

Section: Discussionmentioning

confidence: 82%

Electrochemical Water Oxidation with Cobalt-Based Electrocatalysts from pH 0–14: The Thermodynamic Basis for Catalyst Structure, Stability, and Activity

et al. 2011

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Building upon recent study of cobalt-oxide electrocatalysts in fluoride-buffered electrolyte at pH 3.4, we have undertaken a mechanistic investigation of cobalt-catalyzed water oxidation in aqueous buffering electrolytes from pH 0-14. This work includes electrokinetic studies, cyclic voltammetric analysis, and electron paramagnetic resonance (EPR) spectroscopic studies. The results illuminate a set of interrelated mechanisms for electrochemical water oxidation in alkaline, neutral, and acidic media with electrodeposited Co-oxide catalyst films (CoO(x)(cf)s) as well as for a homogeneous Co-catalyzed electrochemical water oxidation reaction. Analysis of the pH dependence of quasi-reversible features in cyclic voltammograms of the CoO(x)(cf)s provides the basis for a Pourbaix diagram that closely resembles a Pourbaix diagram derived from thermodynamic free energies of formation for a family of Co-based layered materials. Below pH 3, a shift from heterogeneous catalysis producing O(2) to homogeneous catalysis yielding H(2)O(2) is observed. Collectively, the results reported here provide a foundation for understanding the structure, stability, and catalytic activity of aqueous cobalt electrocatalysts for water oxidation.

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Section: Discussionmentioning

confidence: 82%

Electrochemical Water Oxidation with Cobalt-Based Electrocatalysts from pH 0–14: The Thermodynamic Basis for Catalyst Structure, Stability, and Activity

et al. 2011

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“…Thus it was possible that, under certain conditions, the bubble nucleation sites act as particle binder, thereby promoting deposition. Furthermore, the evaporation of microlayer water at the vapor–liquid–solid triple interface of bubble nucleation sites (Figure 3), which was proposed for the deposition of silica and corrosion products in boiling water systems,20–22 may also be a significant factor here. Microlayer evaporation would not only cause a local increase in the concentration of COM and SiO 2 at bubble nucleation sites, but also induce a convective flow of water, which carried the colloidal COM/SiO 2 particles to the heating surface (Figure 3).…”

Section: Resultsmentioning

confidence: 86%

Effect of thermohydraulic conditions on fouling of calcium oxalate and silica

Yu¹,

Sheikholeslami²,

Doherty³

2005

AIChE Journal

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“…Under Ni ion concentrated coolant with Fe ions, the Ni deposit of SS surface has been determined to be NiO, Ni(OH) 2 , and NiFe 2 O 4 [60][61][62]. Ni ion deposition rate has been found to be influenced by Ni ion concentration and heat flux, displaying linear relationship (Figure 7).…”

Section:  Nickle Oxidesmentioning

confidence: 97%

Corrosion and deposition on the secondary circuit of steam generators

Xie

Zhang

2016

Journal of Nuclear Science and Technology

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This study conducts a critical review on the studies of material corrosion and deposition on the secondary circuit of a pressurized water reactor, especially on the steam generators (SGs). Available knowledge has shown that the structural materials in the environment of the secondary circuit are susceptible to flow-accelerated corrosion and deposition-induced degradation. The deposition of the non-volatile impurities, especially the corrosion products, on the SG surfaces can be a primary cause of material degradations, including stress corrosion cracking. The review will analyze the fouling mechanisms and behaviors, the source of impurities, corrosion mechanisms, and the factors that affect the deposition and corrosion behaviors.

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Deposition of Nickel and Cobalt Ions with Iron Crud on Heated Stainless Steel Surface under Nucleate Boiling Conditions.

Cited by 5 publications

References 10 publications

Electrochemical Water Oxidation with Cobalt-Based Electrocatalysts from pH 0–14: The Thermodynamic Basis for Catalyst Structure, Stability, and Activity

Electrochemical Water Oxidation with Cobalt-Based Electrocatalysts from pH 0–14: The Thermodynamic Basis for Catalyst Structure, Stability, and Activity

Effect of thermohydraulic conditions on fouling of calcium oxalate and silica

Corrosion and deposition on the secondary circuit of steam generators

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