Nanometer rare earth zirconate electrolyte for fuel cell and preparation method

A nano rare earth, fuel cell technology, applied in fuel cells, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of difficult sintering, serious powder agglomeration, etc., to improve mechanical properties and toughness, The effect of reducing the difficulty of sintering and simple process method

Inactive Publication Date: 2018-07-17
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problems of difficult sintering of traditional pyrochlore structure ceramics, easy phase transition to ordered phase transformation during medium-temperature processing, and serious powder agglomeration in the preparation pr...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Weigh 30 parts by mass of samarium oxide powder, 37 parts by mass of zirconium oxychloride octahydrate powder, 100 parts by mass of dilute nitric acid and 120 parts by mass of ammonia water with a volume concentration of ammonia gas of 18% for subsequent use;

[0031] (2) Add the rare earth oxide into 1mol / L dilute nitric acid, stir continuously, the stirring frequency is 300rpm, keep the temperature not exceeding 45°C during the stirring process, and after it is completely dissolved, add zirconium oxychloride octahydrate powder, Mix evenly and let stand for 2 hours to obtain mixed ion clear liquid;

[0032] (3) Under an argon protective atmosphere, add excess ammonia water to the mixed ion clear liquid, and react for 150 minutes to obtain a co-precipitated rare earth zirconium gel material. The filter residue is soaked in absolute ethanol and ground by a ball mill to obtain a precursor slurry;

[0033] (4) Carry out two-stage sintering of the precursor slurry, f...

Embodiment 2

[0036] (1) Weigh 35 parts by mass of gadolinium oxide powder, 32 parts by mass of zirconium oxychloride hexahydrate powder, 100 parts by mass of dilute nitric acid and 120 parts by mass of ammonia water with a volume concentration of ammonia gas of 19% for subsequent use;

[0037] (2) Add the rare earth oxide into 1.3mol / L dilute nitric acid, stir continuously, the stirring frequency is 300rpm, keep the temperature not exceeding 45°C during the stirring process, after it is completely dissolved, add zirconium oxychloride hexahydrate powder , mixed evenly, and left to stand for 2 hours to obtain a mixed ion clear liquid;

[0038] (3) Under a helium protective atmosphere, add excess ammonia water to the mixed ion clear liquid, and react for 50 minutes to obtain a co-precipitated rare earth zirconium gel material. The filter residue is soaked in absolute ethanol and ground by a ball mill to obtain a precursor slurry;

[0039] (4) Carry out two-stage sintering of the precursor ...

Embodiment 3

[0042] (1) Weigh 35 parts by mass of samarium oxide powder, 33 parts by mass of zirconium oxychloride hexahydrate powder, 100 parts by mass of dilute nitric acid and 120 parts by mass of ammonia water with a volume concentration of ammonia gas of 19% for subsequent use;

[0043] (2) Add the rare earth oxide into 1.4mol / L dilute nitric acid, stir continuously, the stirring frequency is 210rpm, keep the temperature not exceeding 45°C during the stirring process, and add zirconium oxychloride hexahydrate powder after it is completely dissolved , mixed evenly, and left to stand for 2.7 hours to obtain a mixed ion clear liquid;

[0044] (3) Under a nitrogen protective atmosphere, add excess ammonia water to the mixed ion clear liquid, react for 50 minutes to obtain a co-precipitated rare earth zirconium gel material, age at a temperature of 66°C for 20 hours, and filter the residue After soaking in absolute ethanol and grinding in a ball mill, the precursor slurry is obtained;

...

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Abstract

The invention provides a preparation method of a nanometer rare earth zirconate electrolyte for a fuel cell. The method comprises the steps that rare earth oxide is dissolved a dilute nitric acid andzirconyl chloride solution and evenly mixed, the solution is mixed with excessive ammonium hydroxide, a gel material aqueous solution is obtained through coprecipitation and ageing, and after the solution is filtered, filter residues are soaked in alcohol, dispersed and ground; then, pre-burning at low temperature is conducted, and residual ammonium ions are desorbed; finally, sintering at high temperature is conducted, heat preservation is conducted for 4 h at 1,500 DEG C or above, and after cooling, nanometer-phase rare earth zirconate ceramic powder is obtained. According to the preparationmethod, the problems are solved that for a traditional pyrochlore structure, the ceramic is difficultly sintered, ordering phase change is easily caused during medium-temperature processing, and theagglomeration degree of the powder is high in the preparation process; the prepared film material can be evenly formed into film, the mechanical property and toughness of the film are high, and accordingly the service life of the electrolyte is prolonged.

Description

technical field [0001] The invention relates to the field of fuel cell materials, in particular to a nanometer rare earth zirconate electrolyte for a fuel cell and a preparation method thereof. Background technique [0002] A fuel cell is an energy conversion device based on redox reactions. It can directly convert the chemical energy of the fuel into electrical energy without going through the Carnot cycle process during the conversion process, and can obtain higher efficiency than the traditional heat engine power generation system. It has the advantages of high efficiency, low noise, environmental friendliness, safety and reliability. [0003] According to the properties of fuel cell electrolyte, fuel cells can be divided into alkaline fuel cells, phosphate fuel cells, molten carbonate fuel cells, proton exchange membrane fuel cells and solid oxide fuel cells. Compared with the other four fuel cells, solid oxide fuel cells have their unique advantages. First, the higher...

Claims

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Application Information

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IPC IPC(8): H01M8/1253B82Y30/00
CPCB82Y30/00H01M8/1253H01M2008/1293Y02E60/50
Inventor 陈庆廖健淞
Owner CHENDU NEW KELI CHEM SCI CO LTD
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