Corrosion of high density graphite anodes during direct electrochemical de-oxidation of solid oxides in molten CaCl2 medium

Vishnu, D. Sri Maha; Sure, Jagadeesh; Mohandas, K.S.

doi:10.1016/j.carbon.2015.05.093

Cited by 16 publications

(4 citation statements)

References 30 publications

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“…In addition to polluting the environment, the generated CO 2 will dissolve in the electrolyte and cause a series of side reactions, which will affect the accurate control of the components in the cathode products. [53,54] A series of non-carbon inert materials, such as stable noble metals (Ir, Pt), conductive oxides (SnO 2 , CaRuO 3 ), and alloys (Cr-Fe) with a protective oxide layer with a protective oxide layer, are been studied are used to avoid the generation of CO 2 . [13,55,56] It is also a strategy to separate the generated carbon oxide from the electrolyte.…”

Section: Sio Cao Casiomentioning

confidence: 99%

Electrolysis Synthesis of Carbides and Carbon Dioxide Capture in Molten Salts

Ren

Shao-long

et al. 2023

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Section: Sio Cao Casiomentioning

confidence: 99%

Electrolysis Synthesis of Carbides and Carbon Dioxide Capture in Molten Salts

Ren

Shao-long

et al. 2023

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“…However, it is known that the use of graphite-based anode will pollute the molten salts and decrease the current ef ciency. 39) In addition, the cathodic products will also be inevitably contaminated by the graphite-based anode because of the side reactions, e.g., CO 2 + O 2− → CO 3 2− and CO 3 2− + 4e…”

Section: Introductionmentioning

confidence: 99%

Direct Extraction of Titanium Alloys/Composites from Titanium Compounds Ores in Molten CaCl<sub>2</sub>

Zou

et al. 2017

Mater. Trans.

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Molten salt electroreduction process provides a simple approach for the facile production of alloys and composites. In this work, the solid oxide membrane (SOM)-assisted molten salt electroreduction process has been used to produce titanium alloys/composites directly from complex titanium compounds ores. The Ti-bearing blast-furnace slag, high titanium slag and natural ilmenite were used as raw materials. The SOM-assisted electroreduction process was carried out in molten calcium chloride (CaCl 2 ) at 950-1000 C and 3.8 V. The reaction mechanisms of the electroreduction process including the compounding process, the electroreduction process and the impurity-removal process were discussed. The results indicate that Ti

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“…For a Hall-Héroult cell, 20 the anodic gas contains 30-10% CO and 70-90% CO 2 . 21 In molten CaCl 2 , the electrochemical behaviors of carbon, [22][23][24][25] transition metals/alloys 26 and ceramics [27][28][29] were studied. Jin et al reported that the oxidation of graphite in molten CaCl 2 -CaO involved two steps, and the polarization of anode remarkably affected the energy consumption of the electrolysis.…”

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confidence: 99%

“…In addition, the concentration of oxide ions greatly affects the electrolysis in terms of absorbing CO 2 and incurring parasitic reactions caused by the reduction of carbonate. 18,33 In most of the reported data about the oxidation process of the carbon electrode in molten CaCl 2 , [22][23][24][25] the mechanism and the anodic products were proposed solely by thermodynamic or electrochemical data. The real anodic products under a certain potential have not been directly verified.…”

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confidence: 99%

Anodic Gases Generated on a Carbon Electrode in Oxide-Ion Containing Molten CaCl₂ for the Electro-Deoxidation Process

Xie¹,

Zhao²,

Song³

et al. 2018

J. Electrochem. Soc.

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The gas generated on a commonly used carbon anode is highly related to the efficiency of electrolysis and the purity of cathodic products in molten CaCl 2 . Herein, the anodic gas generated on a carbon working electrode in a three-electrode setup was systematically analyzed using a gas chromatograph under controlled potentials in both molten CaCl 2 and CaCl 2 -1 wt%CaO. Two successive oxidation steps of the graphite electrode were observed. The anodic gas contains both CO and CO 2 with an atomic ratio (CO/CO 2 ) of 0.076, 0.072, 0.073, and 0.144 under anodic potentials of 0V, 0.2V, 0.4V, and 0.6V (vs. Ag/AgCl) in molten CaCl 2 , respectively, while the atomic ratios of CO/CO 2 are 3.639, 2.008, 1.666, 0.720 in molten CaCl 2 -1 wt%CaO. Therefore, CaO remarkably enhances the kinetics of the formation of CO and absorption of the generated CO 2 forming CO 3 2− that could decrease the efficiency of the electrolysis and purity of cathodic products.

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Corrosion of high density graphite anodes during direct electrochemical de-oxidation of solid oxides in molten CaCl2 medium

Cited by 16 publications

References 30 publications

Electrolysis Synthesis of Carbides and Carbon Dioxide Capture in Molten Salts

Electrolysis Synthesis of Carbides and Carbon Dioxide Capture in Molten Salts

Direct Extraction of Titanium Alloys/Composites from Titanium Compounds Ores in Molten CaCl<sub>2</sub>

Anodic Gases Generated on a Carbon Electrode in Oxide-Ion Containing Molten CaCl₂ for the Electro-Deoxidation Process

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Corrosion of high density graphite anodes during direct electrochemical de-oxidation of solid oxides in molten CaCl2 medium

Cited by 16 publications

References 30 publications

Electrolysis Synthesis of Carbides and Carbon Dioxide Capture in Molten Salts

Electrolysis Synthesis of Carbides and Carbon Dioxide Capture in Molten Salts

Direct Extraction of Titanium Alloys/Composites from Titanium Compounds Ores in Molten CaCl<sub>2</sub>

Anodic Gases Generated on a Carbon Electrode in Oxide-Ion Containing Molten CaCl2 for the Electro-Deoxidation Process

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Product

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Anodic Gases Generated on a Carbon Electrode in Oxide-Ion Containing Molten CaCl₂ for the Electro-Deoxidation Process