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Composite oxygen electrode used for solid oxide electrolytic tank and preparing method of composite oxygen electrode

A solid oxide, oxygen electrode technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of unsuitable oxygen electrodes and low electrode activity, so as to alleviate the problem of performance degradation, improve the electrocatalytic activity of the electrode, and increase the electrocatalytic activity. Effects of chemically reactive regions

Active Publication Date: 2019-03-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the anisotropic ion transport properties of its layered structure, Ln 2 NiO 4 When the thickness is large, the electrode activity is low, and it is not suitable as the host material of the oxygen electrode

Method used

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  • Composite oxygen electrode used for solid oxide electrolytic tank and preparing method of composite oxygen electrode
  • Composite oxygen electrode used for solid oxide electrolytic tank and preparing method of composite oxygen electrode
  • Composite oxygen electrode used for solid oxide electrolytic tank and preparing method of composite oxygen electrode

Examples

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Effect test

Embodiment 1

[0036] This example is Ba with different molar ratios 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3-δ -SDC porous composite electrode;

[0037] The specific steps for preparing the new BSCF-SDC porous composite oxygen electrode:

[0038] Step 1: Preparation of Sm by sol-gel method (sol-gel) 0.2 Ce 0.8 o 1.9 (SDC) Electrolyte material powder according to Sm 0.2 Ce 0.8 o 1.9 Configure Ce(NO 3 ) 2 ·6H 2 O, Sm(NO 3 ) 3 ·6H 2 O solution, using citric acid monohydrate as a complexing agent and a sintering aid, the amount of citric acid monohydrate added is 1.5 times the molar weight of the total metal ions, and the mixed solution is heated in a water bath at 70°C until it becomes gelatinous. Continue heating in a universal furnace until combustion to form SDC precursor powder, and finally calcine at a temperature of 800°C for 2 hours to obtain the SDC target powder;

[0039] Step 2: Glycine-nitrate method (GNP) prepares Ba 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3-δ (BSCF) material powder ...

Embodiment 2

[0047] This example uses La 2 NiO 4 (LNO) as the active material, by solution in situ impregnation method for Ba 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3-δ -SDC porous multi-phase electrode is modified to finally obtain LNO / BSCF-SDC novel composite oxygen electrode and its preparation steps.

[0048] The specific steps for preparing the new LNO / BSCF-SDC porous composite oxygen electrode:

[0049] Step 1: Preparation of Sm by sol-gel method (sol-gel) 0.2 Ce 0.8 o 1.9 (SDC) Electrolyte material powder according to Sm 0.2 Ce 0.8 o 1.9 Configure Ce(NO 3 ) 2 ·6H 2 O, Sm(NO 3 ) 3 ·6H 2 O solution, using citric acid monohydrate as a complexing agent and a sintering aid, the amount of citric acid monohydrate added is 1.5 times the molar weight of the total metal ions, and the mixed solution is heated in a water bath at 70°C until it becomes gelatinous. Continue heating in a universal furnace until combustion to form SDC precursor powder, and finally calcine at a temperature of 8...

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Abstract

The invention discloses a composite oxygen electrode used for a solid oxide electrolytic tank and a preparing method of the composite oxygen electrode. The composite oxygen electrode comprises an electrolyte layer, a substrate layer and active coating layers. The substrate layer is a BSCF-SDC composite porous material and covers the electrolyte layer. The active coating layers cover the outer surface of the BSCF-SDC composite porous material and the inner surfaces of pores. By means of the composite oxygen electrode, the BSCF-SDC composite porous material is adopted as the electrode body material, then the Ln2NiO4 active coating layers with good electric conductivity and CO2 tolerance are formed on the surface of the composite porous material and in the pores, and the electrochemical property and long-term stability of the composite oxygen electrode material are obviously improved.

Description

technical field [0001] The invention belongs to the technical field of solid oxide electrolytic cells, in particular to a composite oxygen electrode for a solid oxide electrolytic cell and a preparation method thereof. Background technique [0002] At present, in my country's energy structure, fossil fuels such as coal still occupy a major part. The long-term use of fossil fuels has led to a sharp increase in the content of pollutants such as carbon dioxide, sulfur dioxide, and nitrogen oxides in the atmosphere, resulting in frequent occurrence of smog and other extreme weather, which has brought great damage to my country's ecological environment. [0003] A solid oxide electrolytic cell (SOEC) is an electrochemical device that converts electrical energy into chemical energy, and its basic principle is the reverse process of a solid oxide fuel cell (SOFC). Through the operation of SOEC, water can be converted into hydrogen, and carbon dioxide and water can also be co-elect...

Claims

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Application Information

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IPC IPC(8): C25B11/03C25B11/04C25B1/00C25B1/04
CPCC25B1/00C25B1/04C25B11/031C25B11/051Y02E60/36
Inventor 孔江榕黄文谢益林
Owner CENT SOUTH UNIV
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