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Making method solid oxide electrolytic cell

A technology of solid oxide and production method, applied in the field of materials, can solve problems such as electrolyte loss, corrosion of metal parts, electrolyte pollution, etc., and achieve the effect of overcoming influence and avoiding corrosion problems.

Inactive Publication Date: 2008-11-12
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the electrolytic cells mentioned in the above-mentioned patents that use high-temperature molten salt as the electrolyte, there are electrolyte loss caused by the evaporation of the electrolyte salt, and the corrosion of metal parts caused by the steam; at the same time, the electrolyte salt is composed of anions and cations. Oxidation of anions on the graphite anode may cause ablation of the graphite electrode and contamination of the electrolyte, thereby affecting the purity of the cathode reduction reaction product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] First, prepare the cathode.

[0023] Titanium dioxide in granular or powder form is pressed together with metal titanium mesh, sintered at 800°C for 1 hour in an argon atmosphere, and then used as a cathode after cooling.

[0024] Next, a semi-electrolytic cell consisting of an electrolyte and an anode is prepared.

[0025] The solid oxide electrolyte powder, ScSZ (or CGO) powder, is formed into a green body by tape casting, and then sintered at 1400°C for 3 hours in an oxidizing atmosphere, and then naturally cooled to obtain a dense solid electrolyte film; After the natural cooling of the solid electrolyte film, continue to screen-print an anode active layer with a thickness of 5 μm, which is composed of 50% (weight percent) LSFC (La 0.58 Sr 0.4 Fe 0.8 co 0.2 o 3-δ ) and 50% (weight percent) of CGO; then, on top of the anode activation layer, a layer of single-phase LSFC with a thickness of 50 μm was screen-printed as the anode contact layer. The prepared semi-e...

Embodiment 2

[0028] In the following examples, a solid oxide electrolyte electrolyzer is used to electrolyze metal oxides to prepare high-purity metals. The cathode is a metal oxide, the anode is an oxide-based composite material with a perovskite structure, and the electrolyte is a solid oxide electrolyte. Inert gas (such as nitrogen or argon) is introduced into the cathode chamber, a gas guide tube is inserted into the anode chamber, and a voltage is applied to both ends of the cathode and anode for electrolysis, so that high-purity metal can be obtained at the cathode end and high-purity metal at the anode end. pure oxygen. Concrete reaction formula is as follows:

[0029] Anode: O 2* →1 / 2O 2 (g)+2e -

[0030] Cathode: MO+2e - →O 2* +M(s)

[0031] Total reaction: MO+electric energy→M(s)+1 / 2O 2 (g)

[0032] First, prepare the cathode.

[0033] Use titanium dioxide in granular or powder form, and polymer foam to form a slurry, dry and heat to 400°C to remove organic matter, the...

Embodiment 3

[0039] The following examples use a solid oxide electrolyte electrolyzer to electrolyze water to produce high-purity hydrogen and oxygen. The cathode is a metal, the anode is an oxide-based composite material with a perovskite structure, and the electrolyte is a solid oxide electrolyte. Introduce water vapor into the cathode chamber, and insert the air guide tube; insert the air guide tube in the anode room, apply voltage at both ends of the cathode and anode for electrolysis, you can get high-purity hydrogen at the cathode end, and high-purity hydrogen at the anode end oxygen. Concrete reaction formula is as follows:

[0040] Anode: O 2* →1 / 2O 2 (g)+2e -

[0041] Cathode: H 2 O(g)+2e - →O 2* +H 2 (g)

[0042] Overall reaction: H 2O(g)+electric energy→H 2 (g)+1 / 2O 2 (g)

[0043] First, prepare the cathode.

[0044] Metal nickel powder in the form of powder is poured into a graphite box, sintered at 900°C for 1 hour under an argon atmosphere, and the porous tweez...

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Abstract

The invention provides a method for making a solid oxide electrolyte bath, belonging to the material technical field. The concrete steps of the method are as follows: corresponding metal oxides deposited on the metal matrix undergo the sintering and the natural cooling to be used as a cathode, or the metal is directly used as the cathode; electrolyte powers of the solid oxide form the biscuit by the method of flow casting forming, and the biscuit is sintered in an oxidative atmosphere and naturally cooled to form a compact solid electrolyte film, and an anode active layer and an anode contact layer are continuously deposited and sintered so as to become a semi electrolyte bath; solid oxides in the cathode and the semi electrolyte bath are closely contacted, forming the solid oxide electrolyte bath. The method avoids the loss of electrolytes and the possible corrosive problem.

Description

technical field [0001] The invention relates to a method in the technical field of materials, in particular to a method for manufacturing a solid oxide electrolytic cell. Background technique [0002] It is a conventional and relatively mature industrial process to produce the required chemical products by electrolysis. The most well-known ones are the chlor-alkali industry of electrolysis in aqueous solution and the process of hydrometallurgy in high-temperature molten salt to prepare metal aluminum. [0003] After searching the literature of the prior art, it is found that the Chinese patent application number is 00267763.6, and the patent titled "A New Type of Molten Salt Electrolyzer" introduces the structure of a molten salt electrolyzer: the tank shell is made of cylindrical cast iron The crucible is composed of a cylindrical graphite crucible close to it, and is used as the anode of the electrolytic cell; the molten salt electrolyte is filled in the graphite crucible...

Claims

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Application Information

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IPC IPC(8): C25C5/00C25C7/00
Inventor 余晴春屠恒勇胡鸣若隋升李海滨
Owner SHANGHAI JIAO TONG UNIV
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