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Composite doped cerium oxide electrolyte and preparation method thereof

A composite doping and composite oxide technology, which is applied in the field of composite doped cerium oxide electrolyte and its preparation, can solve the problems of reduced efficiency and reduced ionic conductivity of cerium oxide, so as to improve the yield, improve the ionic conductivity, and prepare The effect of simple process

Inactive Publication Date: 2009-01-07
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cerium oxide-based SOFCs suffer from reduced efficiency due to the generation of electronic conductance when operating above 600 °C
If the operating temperature of cerium oxide SOFC is lowered to 500-600°C, the problem of electronic conductivity will be greatly reduced, but the ionic conductivity of cerium oxide will also decrease accordingly.

Method used

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  • Composite doped cerium oxide electrolyte and preparation method thereof
  • Composite doped cerium oxide electrolyte and preparation method thereof
  • Composite doped cerium oxide electrolyte and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1, preparation meets Ce 0.8 Gd 0.05 Y 0.15 o 1.9 Stoichiometric ratio of gadolinium, yttrium composite doped ceria electrolyte

[0027] According to the stoichiometric ratio of cerium, gadolinium and yttrium ions in the molar ratio of 0.8:0.05:0.15, weigh cerium nitrate, gadolinium nitrate and yttrium nitrate, dissolve them in deionized water, stir continuously to dissolve them fully, form a clear solution and add Glycine, so that the molar ratio of glycine and nitrate ions is 0.2:1, adjust the pH value of the solution to 7.5 with ammonia water, then heat and evaporate at 80°C to remove water until a tan viscous gel is formed, and the water in the gel is evaporated to dryness Finally, move it to a constant temperature electric furnace at 200°C. The dry gel begins to expand, boil, and smoke in about 3 minutes, and then generates a flame and discharges a large amount of gas. After the reaction is completed, a light yellow fluffy powder is formed. After the p...

Embodiment 2

[0028] Embodiment 2, preparation meets Ce 0.8 Gd 0.1 Y 0.1 o 1.9 Stoichiometric ratio of gadolinium, yttrium composite doped ceria electrolyte

[0029] According to the stoichiometric ratio of cerium, gadolinium and yttrium ions in the molar ratio of 0.8:0.1:0.1, weigh cerium nitrate, gadolinium nitrate and yttrium nitrate, dissolve them in deionized water, stir continuously to dissolve them fully, form a clear solution and add Glycine, so that the molar ratio of glycine and nitrate ions is 0.3:1, adjust the pH value of the solution to 7.5 with ammonia water, then heat and evaporate at 80°C to remove water until a tan viscous gel is formed, and the water in the gel is evaporated to dryness Finally, move it to a constant temperature electric furnace at 200°C. The dry gel begins to expand, boil, and smoke in about 3 minutes, and then generates a flame and discharges a large amount of gas. After the reaction is completed, a light yellow fluffy powder is formed. After the powde...

Embodiment 3

[0030] Embodiment 3, preparation meets Ce0.8 Gd 0.15 Y 0.05 o 1.9 Stoichiometric ratio of gadolinium, yttrium composite doped ceria electrolyte

[0031] According to the stoichiometric ratio of cerium, gadolinium and yttrium ions in the molar ratio of 0.8:0.15:0.05, weigh cerium nitrate, gadolinium nitrate and yttrium nitrate, dissolve them in deionized water, stir continuously to dissolve them fully, form a clear solution and add Glycine, so that the molar ratio of glycine and nitrate ions is 0.5:1, adjust the pH value of the solution to 8.5 with ammonia water, then heat and evaporate at 80°C to remove water until a tan viscous gel is formed, and the water in the gel is evaporated to dryness Finally, move it to a constant temperature electric furnace at 200°C. The dry gel begins to expand, boil, and smoke in about 3 minutes, and then generates a flame and discharges a large amount of gas. After the reaction is completed, a light yellow fluffy powder is formed. After the pow...

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Abstract

The invention discloses a composite doped cerium oxide electrolyte and its preparation method, which is compound of cerium oxide, gadolinium oxide and yttrium oxide with stoichiometric ratio of Ce1-xGdx-yYyO2-0.5x, in which, 0.1<=x<=0.2, 0 H01M 8 / 02 H01B 1 / 08 C01F 17 / 00 B01J 19 / 00 H01M 8 / 10 2 6 1 2006 / 12 / 22 101000966 2007 / 7 / 18 100449835 2009 / 1 / 7 2009 / 1 / 7 2009 / 1 / 7 Tsinghua Univ. Beijing 100084 Zhou Heping Guang Xiangfeng Liu Zhihui Wang Yanan Zhang Jun guanchang renfeng hua 11245

Description

technical field [0001] The invention relates to a composite doped cerium oxide electrolyte and a preparation method thereof in the field of solid oxide fuel cells. Background technique [0002] A solid oxide fuel cell (Solid Oxide Fuel Cell, SOFC) is a power generation device that directly converts the chemical energy of fuel into electrical energy through an ion-conducting oxide ceramic electrolyte. In addition to the characteristics that energy conversion is not limited by the Carnot cycle and high energy utilization rate, it also has many advantages: it adopts an all-solid-state battery structure, and there is no problem of electrolyte corrosion or loss; Internal fuel reforming is realized, and the fuel adaptability is very wide; the power generation efficiency is high, and the primary power generation efficiency can reach more than 65%. If the high-temperature exhaust gas is combined with the gas turbine, the total power generation efficiency can reach more than 85%. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/02H01B1/08C01F17/00B01J19/00H01M8/10H01M8/126
CPCY02E60/521Y02E60/50
Inventor 周和平关翔锋刘志辉王亚楠张郡
Owner TSINGHUA UNIV
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