Vanadium-doped in lanthanum site apatite-type lanthanum silicate solid electrolyte material and preparation method thereof

A technology of solid electrolyte and apatite, which is applied in the direction of solid electrolyte fuel cells and fuel cell components, can solve the problems of complex preparation process, low polarization loss, and restrictions on large-scale application, and achieve high conductivity, The effect of extending the service life

Inactive Publication Date: 2009-12-30
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional solid electrolytes usually need to work at high temperatures of 800-1000 °C. Although this has its unique advantages, such as low polarization loss, high oxygen ion conductivity of solid electrolytes, and waste gas heat can be recycled, etc., high temperat

Method used

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  • Vanadium-doped in lanthanum site apatite-type lanthanum silicate solid electrolyte material and preparation method thereof
  • Vanadium-doped in lanthanum site apatite-type lanthanum silicate solid electrolyte material and preparation method thereof
  • Vanadium-doped in lanthanum site apatite-type lanthanum silicate solid electrolyte material and preparation method thereof

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[0031] Example 1

[0032] Preparation of 0.002 mol La by the sol-gel method 9.5 V 0.5 (SiO 4 ) 6 O 3.5 Powder: Weigh La (NO 3 ) 3 ·6H 2 Put 8.2274g of O powder into a 100ml tall beaker, add 5.36ml of ethanol and 5.36ml of glacial acetic acid, stir until the powder is completely dissolved to obtain a colorless and transparent solution, then slowly add (about 30 minutes) 2.68ml of TEOS under stirring conditions , the obtained colorless and transparent solution was continuously stirred for 1h until the reaction was complete; at the same time, 0.1170g NH was dissolved in 2ml of dilute ammonia water with a concentration of 9.5% by weight. 4 VO 3 An orange solution was obtained. The orange solution was slowly added to the colorless and transparent solution under rapid stirring. The obtained orange solution was continuously stirred for 1 h. The orange solution was slowly stirred and evaporated at 80 °C until it was in a gel state. After drying at 130 °C, about 10 mg was weig...

Example Embodiment

[0033] Example 2

[0034] Preparation of 0.002mol La by sol-gel method 9.0 V 1.0 (SiO 4 ) 6 o 4.0 Powder: weigh La(NO 3 ) 3 ·6H 2 Put 7.7944g of O powder into a 100ml tall beaker, add 5.36ml of ethanol and 5.36ml of glacial acetic acid, stir until the powder is completely dissolved to obtain a colorless transparent solution, then slowly add (about 30 minutes) 2.68ml of TEOS under stirring conditions , the obtained colorless and transparent solution was continuously stirred for 1h until the reaction was complete; at the same time, 0.2340gNH 4 VO 3 An orange solution was obtained. Slowly add the orange solution (20 minutes) into the colorless and transparent solution under rapid stirring, and the obtained orange solution continues to stir for 1 hour, slowly stir and evaporate the orange solution at 60°C until it is in a gel state, and then dry at 150°C and cool at 500°C Pre-baked for 5 hours, the fully ground powder was pressed into a membrane under a pressure of 10Mpa...

Example Embodiment

[0035] Example 3

[0036] Preparation of 0.002mol La by sol-gel method 8.5 V 1.5 (SiO 4 ) 6 o 4.5 Powder: weigh La(NO 3 ) 3 ·6H 2 Put 7.3613g of O powder into a 100ml tall beaker, add 5.36ml of ethanol and 5.36ml of glacial acetic acid, stir until the powder is completely dissolved to obtain a colorless transparent solution, then slowly add (about 30 minutes) 2.68ml of TEOS under stirring conditions , the obtained colorless transparent solution was continuously stirred for 1h until the reaction was complete; at the same time, 0.3510gNH was dissolved in 10% dilute ammonia water with a concentration of 3ml 4 VO 3 An orange solution was obtained. Slowly add the orange solution (about 20 minutes) into the colorless and transparent solution under rapid stirring (600n / min), and the obtained orange solution continues to stir for 1h, and slowly stirs (30n / min) at 60°C to evaporate the orange solution until it solidifies. In the gel state, after drying at 150°C and pre-calcin...

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Abstract

The invention discloses a vanadium-doped in lanthanum site apatite-type lanthanum silicate solid electrolyte material and a preparation method thereof. The chemical formula of the solid electrolyte material is La10-xVx(SiO4)6O3+x; wherein, x is more than 0 and is not more than 1.5; the preparation method comprises the following steps: synthesizing apatite-type electrolyte material precursor through the sol-gel method with La(NO3)3-6H2O, tetraethoxy silane, glacial acetic acid and methanol in a molar ratio of 10-8.5:6:12:12, preparing membranes at 10-20MPa with the powder which is treated through drying and preroasting and finally roasting the membranes at 800-1500 DEG C for 2-6h. In the preparation method of the invention, the doping of vanadium in lanthanum site reduces the roasting temperature and time of the electrolyte material which has higher conductivity at the middle-low temperature(600-800 DEG C) and is used for the electrolyte layer of the solid oxide fuel cell so that the service life of cells can be effectively prolonged.

Description

technical field [0001] The invention relates to a solid electrolyte material, in particular to a vanadium-doped lanthanum apatite type lanthanum silicate solid electrolyte material and a preparation method thereof. Background technique [0002] Solid oxide fuel cells (SOFCs) have very broad application prospects in power generation, cogeneration, transportation, military, aerospace and other fields, and solid electrolytes are a key part of solid oxide fuel cells, which play the role of isolating reactive gases and It plays an important role in transporting oxygen ions, and its electrical conductivity directly affects the performance of fuel cells. Traditional solid electrolytes usually need to work at high temperatures of 800-1000 °C. Although this has its unique advantages, such as low polarization loss, high oxygen ion conductivity of solid electrolytes, and exhaust heat can be recycled, etc., high temperature operation also brings There are other problems, such as slow d...

Claims

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Application Information

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IPC IPC(8): H01M8/02H01M8/10
CPCY02E60/522Y02E60/50
Inventor 袁文辉梁杰李莉申荣平
Owner SOUTH CHINA UNIV OF TECH
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