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Lithium carbonate modified cerium barium zirconate proton conductor material and preparation method thereof

A technology of cerium barium zirconate and proton conductor, which is applied in the field of lithium carbonate modified cerium barium zirconate proton conductor material and its preparation, can solve the problems of sintering densification difficulty, material performance degradation, etc., and achieve improved electrical performance and stability , Improve sintering performance, increase the number of effects

Inactive Publication Date: 2013-07-31
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But since BaZrO 3 However, there are still some difficulties in sintering and densification of materials, and high-temperature sintering may easily cause Ba to be missing from the A site, thereby degrading the performance of the material. Therefore, it is very important to study easier sintering methods

Method used

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  • Lithium carbonate modified cerium barium zirconate proton conductor material and preparation method thereof
  • Lithium carbonate modified cerium barium zirconate proton conductor material and preparation method thereof
  • Lithium carbonate modified cerium barium zirconate proton conductor material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] According to BaCe 0.７ Zr 0.1 Y 0.2 o 3-δ stoichiometric ratio, take 1 mole of Ba(NO 3 ) 2 , 0.７ Mole CeWO 3 ) 3 ·6H 2 O, 0.1 mole Zr(NO 3 ) 4 ·5H 2 O, 0.2 mole Y (NO3 ) 3 ·6H 2 O, mix according to the total metal ions: EDTA: citric acid (molar ratio) = 1:1.5:1, dissolve in 500lnL deionized water, use ammonia water to adjust the pH value of the solution to 8, heat and stir to evaporate the water continuously to obtain a viscous shape The light yellow gel is obtained by burning the organic matter in a stainless steel reaction vessel to obtain off-white powder, then pre-calcined at 240 ° C, kept for 5 hours, and finally calcined at 1000 ° C, kept for 5 hours, to prepare a pure phase BaCe 0.7 Zr 0.1 Y 0.2 o 3-δ (BZCY) Pale yellow powder. Add 2.5% lithium carbonate by mass to the base powder, and use absolute ethanol as the medium for ball milling and mixing for 6 hours. After drying, grinding, and sieving, weigh 0.7 grams of the mixed electrolyte powder an...

Embodiment 2

[0023] According to BaCe 0.7 Zr 0.1 Y 0.2 o 3-δ stoichiometric ratio, take 1 mole of Ba(NO 3 ) 2 , 0.7 mol CeWO 3 ) 3 ·6H 2 O, 0.1 mole Zf(NO 3 ) 4 ·5H 2 O, 0.2 mole Y (NO 3 ) 3 ·6H 2 O, mix according to total metal ion: EDTA: citric acid (molar ratio) = 1:2:1, dissolve in 500mL deionized water, use ammonia water to adjust the pH value of the solution to 6, heat and stir to make the water evaporate continuously to obtain a viscous shape The light yellow gel is obtained by burning organic matter in a stainless steel reaction vessel to obtain an off-white powder, then pre-calcined at 240°C for 5 hours, and finally calcined at 1050°C for 5 hours to prepare a pure-phase BZCY light yellow powder body. Add lithium carbonate with a mass percentage of 5% to the matrix powder, mix and ball mill with absolute ethanol for 6 hours, then dry, grind, and sieve, weigh 0.7 grams of the mixed electrolyte powder and pour it into a 12mm mold Carry out dry pressing molding in the m...

Embodiment 3

[0026] According to BaCe 0.7 Zr 0.1 Y 0.2 o 3-δ stoichiometric ratio, take 1 mole of Ba(NO 3 ) 2 , 0.7 mol CeWO 3 ) 3 ·6H 2 O, 0.1 mole Zr(NO 3 ) 4 ·5H 2 O, 0.2 mole YWO 3 ) 3 ·6H 2 O, mix according to total metal ion: EDTA: citric acid (molar ratio)=1:1.5:1, dissolve in 500mL deionized water, use ammonia water to adjust the pH value of the solution to 7, heat and stir to make the water evaporate continuously to obtain a viscous shape The light yellow gel is obtained by burning organic matter in a stainless steel reaction vessel to obtain off-white powder wood, then pre-calcined at 240°C for 5 hours, and finally calcined at 1100°C for 5 hours to prepare a pure phase of BZCY light yellow Powder. Add 7% lithium carbonate by mass to the matrix powder, mix and ball mill for 6 hours with absolute ethanol as the medium, then dry, grind and sieve, weigh 0.7 g of the mixed electrolyte powder and pour it into a 15mm mold Carry out dry pressing molding, the pressure is 20...

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Abstract

The invention discloses a lithium carbonate modified cerium barium zirconate proton conductor material. Raw material components and molar ratio percentage content thereof are BaCe0.7Zr0.1Y0.2O3-delta, and on the basis, 0%-7.5% by mass of lithium carbonate and 0%-4% by mole of zinc oxide are added. BaCe0.7Zr0.1Y0.2O3-delta powder is synthesized by a nitrate-citric acid gel auto-combustion method; then an inorganic salt sintering aid lithium carbonate zinc oxide are added in the power; the powder is shaped by dry pressing and sintered at a temperature of 1,150-1,300 DEG C. The raw materials of the lithium carbonate modified cerium barium zirconate proton conductor material are low in cost; the preparation process is simple and time-saving; relatively high conductivity can be obtained under the premise of increasing sintering performance of the materials; and the lithium carbonate modified cerium barium zirconate proton conductor material provides a foundation for low temperature development of solid oxide fuel cells.

Description

technical field [0001] The invention belongs to a ceramic composition characterized by components, in particular to a lithium carbonate modified cerium barium zirconate proton conductor material and a preparation method thereof. Background technique [0002] Due to the advantages of high energy conversion efficiency, no pollution, strong fuel adaptability, light weight and solid-state structure, fuel cells have great development potential and application prospects, and are known as the most promising new generation of green chemical power generation in the 21st century. device. One of the development trends of solid oxide fuel cells (SOFCs) is to reduce the operating temperature of the cells. Perovskite-structured proton conductors have high electrical conductivity and proton transfer number and low conduction activation energy (Iwallara H, Ono K. Proton conduction inintered oxides based on BaCeO 3 [J].J.Electrochem.Soc., 1988,135(2):529~533), is one of the best choices of...

Claims

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Application Information

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IPC IPC(8): C04B35/50C04B35/63
Inventor 郭瑞松王超许雯雯刘丽
Owner TIANJIN UNIV
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