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Electrolyte composed of zinc doped cerium oxide and inorganic salt in use for fuel cell of solid oxide in low temperature

A composite electrolyte and solid oxide technology, which is applied in solid electrolyte fuel cells, fuel cell parts, fuel cells, etc., can solve the problems of high material cost, and achieve material cost reduction, internal resistance reduction, and high power output Effect

Inactive Publication Date: 2007-09-05
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current research on ceria-inorganic salt composite electrolyte materials is limited to ceria doped with rare earth ions, but from the perspective of cost reduction, rare earths as dopants may lead to higher material costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Press Ce 0.9 Zn 0.1 o 1.9 The stoichiometric ratio, weigh cerium nitrate and zinc nitrate, dissolve in deionized water, stir continuously to make it fully mixed, and the solution is kept at a constant temperature of 40 °C. Then, sodium hydroxide solution is continuously added dropwise to the mixed solution to form a hydroxide sol, wherein n(OH - ):[n(Ce 3+ )+n(Zn 2+ )]=2.9:1, and the pH value of the solution was maintained at 8-10 during the reaction. Then add hydrogen peroxide solution, where n(H 2 o 2 ):[n(Ce 3+ )+n(Zn 2+ )]=0.45:1, the hydroxide in the solution is converted into oxide. Adjust the pH of the solution to 6-7 with sodium hydroxide or nitric acid. The solution was vacuum filtered, the precipitate was washed 3 times with deionized water, dried overnight at 80-100°C, and ground evenly to obtain Ce 0.9 Zn 0.1 o 1.9 Powder.

[0024] Take 5.5 g Ce0.9 Zn 0.1 o 1.9 Powder (55%), add 4.5 grams of lithium carbonate (Li 2 CO 3 ),mix. After fully ...

Embodiment 2

[0026] Get the Ce synthesized by 6 grams of embodiment 1 0.9 Zn 0.1 o 1.9 Powder (60%), add 4 grams of calcium carbonate (CaCO 3 ),mix. After thorough grinding and mixing, put it into a muffle furnace for heat treatment at 800°C for 3 hours, take it out directly and cool it to room temperature, and grind it again to obtain Ce 0.9 Zn 0.1 o 1.9 -CaCO 3 Composite electrolyte powder.

Embodiment 3

[0028] Get the Ce synthesized by 7 grams of embodiment 1 0.9 Zn 0.1 o 1.9 Powder (70%), add 2.106 grams of sodium sulfate (Na 2 SO 4 ) and 0.894 grams of potassium sulfate (MgSO 4 )(Na 2 SO 4 with MgSO 4 The molar ratio is 2:1), mixed. After thorough grinding and mixing, put it into a muffle furnace for heat treatment at 700°C for 3 hours, take it out directly and cool it to room temperature, and grind it again to obtain Ce 0.9 Zn 0.1 o 1.9 -(Na 2 SO 4 -MgSO 4 ) composite electrolyte powder.

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PUM

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Abstract

The disclosed electrolyte is composite material in two phases or multiple phases formed after heat treatment by using admixture of direct synthesized cerium oxide at low temperature with zinc being doped and inorganic salt. Advantages are: low cost of raw material and equipment, simple synthesing technique, good ionic conductivity, open circuit voltage as 1.02V at 600 deg.C, and output power reached up to 600mWcm-2.

Description

technical field [0001] The invention relates to a novel composite electrolyte material for low-temperature solid oxide fuel cells, belonging to the field of solid oxide fuel cells. Background technique [0002] A 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, also known as a ceramic fuel cell (CFC). SOFC is the fourth generation of fuel cells after Alkaline Fuel Cell (AFC), Phosphoric Acid Fuel Cell (PAFC) and Molten Carbonate Fuel Cell (MCFC). Compared with the previous generations of fuel cells, SOFC has high energy conversion efficiency and convenient operation of all solid-state structures; compared with the proton exchange membrane fuel cell (PEMFC) currently being applied and developed as a power source for automobiles, it has strong adaptability to fuel, It does not need to use noble metals as catalysts and other advantages, so it ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/02H01M8/10H01B1/06H01M8/126
CPCY02E60/521Y02E60/50
Inventor 毛宗强黄建兵杨立寨
Owner TSINGHUA UNIV