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Lanthanum molybdate-based intermediate-temperature solid oxide fuel cell electrolyte material and preparation method thereof

A technology of solid oxides and electrolyte materials, which can be used in solid electrolytes, fuel cells, non-aqueous electrolytes, etc., and can solve problems such as limitations

Active Publication Date: 2017-08-25
太湖县市场监督检验所(太湖县功能膜检测研究院)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However La 2 Mo 2 o 9 There is a phase transition point (about 580°C) which greatly limits its application

Method used

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  • Lanthanum molybdate-based intermediate-temperature solid oxide fuel cell electrolyte material and preparation method thereof
  • Lanthanum molybdate-based intermediate-temperature solid oxide fuel cell electrolyte material and preparation method thereof
  • Lanthanum molybdate-based intermediate-temperature solid oxide fuel cell electrolyte material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] According to La 2 o 3 、MoO 3 The molar ratio between CuO and CuO is 1:1.8:0.2 Weigh the material, use absolute ethanol as the medium, mix the material into the mortar, use KEQ-D-P all-round planetary ball mill to grind for 3 hours, and the fineness is controlled at 10μm The following; then transfer the material to a crucible, put it in a muffle furnace, and calcine in air for 10 hours at a calcination temperature of 950°C; after calcination, take it out and grind it sufficiently to finally obtain a solid precursor powder.

[0020] Take 0.75g of the prepared precursor powder and place it in an agate mortar, grind it for half an hour to prevent small particle products; add an appropriate amount of 5% PVA solution for grinding and granulation; then add the granulation product into a stainless steel tablet mold, and Compress with 4MPa pressure for 2min, and reversely press with 8MPa pressure for 2min to make a circular sheet with a diameter of about 12mm and a thickness o...

Embodiment 2

[0022] According to La 2 o 3 、MoO 3 The molar ratio between CuO and CuO is 1:1.6:0.4 Weigh the material, use absolute ethanol as the medium, mix the material into the mortar, use KEQ-D-P all-round planetary ball mill to grind for 2 hours, and the fineness is controlled at 10μm The following; then transfer the material to a crucible, put it in a muffle furnace, and calcine in air for 10 hours at a calcination temperature of 950°C; after calcination, take it out and grind it sufficiently to finally obtain a solid precursor powder.

[0023] Take 1.0 g of the prepared precursor powder and place it in an agate mortar, grind it for half an hour to prevent small particle products; add an appropriate amount of 5% PVA solution for grinding and granulation; then add the granulation product into a stainless steel tablet mold, and Compress with 4MPa pressure for 2min, and reversely press with 8MPa pressure for 2min to make a circular sheet with a diameter of about 12mm and a thickness of ...

Embodiment 3

[0025] According to La 2 o 3 、MoO 3 The molar ratio between CuO and CuO is 1:1.4:0.6 Weigh the material, use absolute ethanol as the medium, mix the material into the mortar, use KEQ-D-P all-round planetary ball mill to grind for 4 hours, and the fineness is controlled at 10μm The following; then transfer the material to a crucible, put it in a muffle furnace, and calcine in air for 10 hours at a calcination temperature of 950°C; after calcination, take it out and grind it sufficiently to finally obtain a solid precursor powder.

[0026] Take 0.5g of the prepared precursor powder and place it in an agate mortar, grind it for half an hour to prevent small particle products; add an appropriate amount of 5% PVA solution for grinding and granulation; then add the granulation product into a stainless steel tablet mold, and Compress with 4MPa pressure for 2min, and reversely press with 8MPa pressure for 2min to make a circular sheet with a diameter of about 12mm and a thickness of...

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Abstract

The invention relates to a lanthanum molybdate-based intermediate-temperature solid oxide fuel cell electrolyte material and a preparation method thereof. The chemical formula of electrolyte materials is La2Mo(2-x)CuxO(9-delta), wherein in the formula, x is larger than 0 and smaller than or equal to 0.6. La2O3, MoO3 and CuO are weighed and added into a mortar with absolute ethyl alcohol as a medium, and grinding is conducted; then the materials are transferred to a crucible, and the crucible with the materials are placed in a muffle furnace for calcination; the materials are taken out and fully ground after being calcined, and finally solid precursor powder is obtained; the precursor powder is taken to be placed in an agate mortar for grinding; a PVA solution is added for grinding and pelletizing; the pelletized product is added into a stainless steel tabletting die and pressed into round slices. Phase transformations of the prepared electrolyte materials are inhibited; a compact ceramic sintered body with the relative density higher than 98% can be obtained after calcination. Along with increase of the copper doping ratio, the oxygen-ion electrical conductivity shows a gradual decrease tend, and the electrolyte materials are expected to be applicable to the field of the lanthanum molybdate-based fuel cell electrolyte material.

Description

technical field [0001] The invention relates to the technical field of fuel cell electrolyte materials, in particular to a lanthanum molybdate-based intermediate temperature solid oxide fuel cell electrolyte material and a preparation method thereof. Background technique [0002] In the past ten years, since the oxygen ion conductor lanthanum molybdate does not have any ion doping, there will be a large number of oxygen vacancies inside the system, and the conductivity of oxygen ions is relatively high under certain conditions and the system The advantages of relatively stable and low operating temperature have attracted widespread attention from scholars studying hydrogen energy solid oxide fuel cell materials. However La 2 Mo 2 o 9 There is a phase transition point (about 580°C) which greatly limits its application. Much research work has focused on La 2 Mo 2 o 9 Doping at different positions can inhibit the occurrence of phase transition and further improve its ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1016
CPCH01M8/1016H01M2300/0068Y02E60/50
Inventor 阳杰王章彪田长安许晓强朱三娥刘安求张霞李少波侯芮张梦刘程左秀秀陈进孙帅喻小霞
Owner 太湖县市场监督检验所(太湖县功能膜检测研究院)
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