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Ytterbium-doped strontium cerate-alkali metal salt co-melt compound and preparation method thereof

A technology of alkali metal salt and strontium cerate, applied in the field of development of solid fuel cell materials, can solve the problems of limited improvement

Inactive Publication Date: 2018-01-16
FUYANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the study found that ytterbium doped SrCeO 3 The electrolyte has excellent proton conductivity at high temperature, but its conductivity is usually in the range of 10 -4 ~10 -3 S cm -1 , how to increase its conductivity to 10 -2 S cm -1 Above, so that it can be applied to the fuel cell is the hotspot of this field's research, there is the use of low-valent cation Y in the prior art 3+ , Yb 3+ 、Lu 3+ 、Eu 3+ and Tm 3 + Replace Ce 4+ to improve SrCeO 3 method for the electrochemical performance of the electrolyte, however, this approach is limited to the extent of improvement

Method used

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  • Ytterbium-doped strontium cerate-alkali metal salt co-melt compound and preparation method thereof
  • Ytterbium-doped strontium cerate-alkali metal salt co-melt compound and preparation method thereof
  • Ytterbium-doped strontium cerate-alkali metal salt co-melt compound and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0156] (1) Preparation of ytterbium-doped strontium ceria

[0157] Step 1-1: Weigh 1 mol of strontium carbonate, 0.025 mol of ytterbium oxide and 0.95 mol of cerium oxide, grind and mix, add anhydrous ethanol to a paste after mixing evenly, continue grinding, and wait for the ethanol to evaporate to powder, then continue to add Absolute ethanol, continue to grind, repeat 4 times;

[0158] Step 1-2, firing at 1300°C for 5h and then sintering at 1500°C for 5h to obtain SrCe 0.95 Yb 0.05 O 3-α The open-circuit voltage of the solid fuel cell assembled with the powder as an electrolyte is 1.07V, and the maximum output power density is 12mW·cm at 700°C -2 .

[0159] (2) the preparation of sodium chloride-potassium chloride co-melt

[0160] Step 2-1, weigh 1 mol of sodium chloride and 1 mol of potassium chloride, grind, mix evenly, heat in a box-type resistance furnace, set the temperature to 720°C, heat for about 30 minutes, cool to room temperature, take out, and grind to Fin...

Embodiment 2

[0166] The method used in this example is similar to that in Example 1, except that (1) the amount of ytterbium oxide added in step 1-1 is 0.05 mol, the amount of cerium oxide added is 0.90 mol, and the chemical composition of the product obtained in step 1-2 SrCe 0.9 Yb 0.1 O 3-α , the open circuit voltage of the solid fuel cell assembled with the single ytterbium doped strontium ceria as electrolyte is 1.07V, and the maximum output power density is 18mW cm at 700℃ -2 .

[0167] The solid fuel cell assembled by using the composite obtained in Example 2 as the electrolyte is denoted as SCYb10-NK, its open circuit voltage is 1.07V, and the maximum output power density is 424mW·cm at 700℃ -2 .

Embodiment 3

[0169] The method used in this example is similar to that in Example 1, except that (1) the amount of ytterbium oxide added in step 1-1 is 0.075 mol, the amount of cerium oxide added is 0.85 mol, and the chemical composition of the product obtained in step 1-2 SrCe 0.85 Yb 0.15 O 3-α , the open circuit voltage of the solid fuel cell assembled with the single ytterbium doped strontium ceria as electrolyte is 1.07V, and the maximum output power density is 20mW cm at 700℃ -2 .

[0170] The solid fuel cell assembled by using the composite obtained in Example 3 as the electrolyte is denoted as SCYb15-NK, its open circuit voltage is 1.07V, and the maximum output power density is 615mW·cm at 700℃ -2 .

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Abstract

The invention provides an ytterbium-doped strontium cerate-alkali metal salt co-melt compound. The ytterbium-doped strontium cerate in the compound is prepared by a solid phase method, a microemulsionmethod or a sol-gel method, and then is composited with the alkali metal salt co-melt at the temperature of 750 DEG C to obtain the compound having good electrochemistry performance, and the operating temperature of a solid fuel cell using the ytterbium-doped strontium cerate as an electrolyte is greatly reduced.

Description

technical field [0001] The present invention relates to the development field of solid fuel cell materials, in particular to a ytterbium-doped strontium ceria-alkali metal salt eutectic compound that can be used as a solid fuel cell and a preparation method thereof. Background technique [0002] Solid fuel cells can directly convert chemical energy into electrical energy in a clean and efficient manner, which has great potential in environmental protection. At present, the working temperature of solid fuel cells is high, generally above 1000 °C, while the working temperature of medium temperature fuel cells is 800 °C. Therefore, the development of electrolytes with high conductivity at lower temperatures is the key to the development of mid-temperature fuel cells. [0003] At present, studies have found that ytterbium doped SrCeO 3 Electrolytes have excellent proton conductivity at high temperatures, but their conductivity is typically around 10 -4 ~10 -3 S cm -1 , how t...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M8/10H01M8/124
CPCY02E60/50
Inventor 王洪涛
Owner FUYANG NORMAL UNIVERSITY
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