Air-electrode material of middle- and low-temperature solid oxide fuel cell and preparation method thereof
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A solid oxide, fuel cell technology, used in fuel cells, battery electrodes, chemical instruments and methods, etc., can solve problems such as structural stability to be improved, achieve good ionic and electronic conduction characteristics, and improve ionic and electronic conductivity. , the effect of good comprehensive performance
Inactive Publication Date: 2018-10-12
CHINA UNIV OF MINING & TECH
View PDF3 Cites 13 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
Sr 3 Fe 2 o 7-δ Oxygen transport performance is anisotropic, showing excellent mixed ion electronic conductivity, and also shows good electrochemical performance as an electrode material, but Sr 3 Fe 2 o 7-δ The structural stability of the
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
preparation example Construction
[0024] The preparation method of the air electrode material is as follows: the improved citric acid combustion method is used to prepare powder, and the improved citric acid combustion method is to add an appropriate amount of complexing agent ethylenediaminetetraacetic acid to the traditional citric acid combustion method, Weigh the chemical raw materials corresponding to each element according to the molar ratio of La:Sr:Fe:Ni=0.25:2.75:1:1, add citric acid and ethylenediaminetetraacetic acid (EDTA) two complexing agents, and then add Dissolve nitric acid and ammonia water, adjust the pH to 7-8, evaporate to dryness and sinter to form a powder, and then pre-fire at 1200°C for 3 hours to obtain the air electrode material powder.
[0025] Concrete preparation steps:
[0026] (1) First calculate the required raw material according to the molar mass of each element: La(NO 3 ) 3 ·6H 2 O, Sr(NO 3 ) 2 , Fe(NO 3 ) 3 9H 2 O, Ni(NO 3 ) 3 ·6H 2 The quality of O, and four kin...
Embodiment 1
[0028] Embodiment 1: weigh La (NO 3 ) 3 ·6H 2 O, Sr(NO 3 ) 2 , Fe(NO 3 ) 3 9H 2 O, Ni(NO 3 ) 3 ·6H 2 O is the raw material, and then weigh the complexing agent citric acid and ethylenediaminetetraacetic acid, wherein the molar ratio of citric acid: ethylenediaminetetraacetic acid: metal ion (La+Sr+Fe+Ni) is 1:0.8:1. Put it into a clean beaker, then add 50-100ml of distilled water, then add 15-20ml of nitric acid, stir, ultrasonically dissolve citric acid and EDTA as much as possible, then add ammonia water, adjust the pH to 7-8, and stir at a constant speed to obtain a clear solution.
[0029] Heat the prepared clear solution in an evaporating dish, concentrate until it evaporates to dryness and starts to burn, stop heating to obtain a powder, then put it into a muffle furnace for pre-calcination at 1200°C-3h, remove organic matter, and obtain La 0.25 Sr 2.75 FeNiO7-δ Powder.
[0030] La 0.25 Sr 2.75 FeNiO 7-δ Add appropriate amount of terpineol containing 10% e...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Login to view more
Abstract
An air-electrode material of a middle- and low-temperature solid oxide fuel cell and a preparation method thereof belong to the field of solid oxide fuel cells. The material selects a Sr<3>Fe<2>O<7-Delta> matrix similar to a perovskite oxide, A site is replaced by trivalent La, the structural stability of the material is further improved, B site employs transition metal Ni to partially substituteFe, and the electrical conductivity and the catalytic activity of the material are further improved. The method comprises the steps of preparing powder by an improved citric acid combustion method, adding an appropriate amount of complexing agent ethylene diamine tetraacetic acid in a traditional citric acid combustion method, weighing a chemical raw material corresponding to each element according to a mole proportion of La, Sr, Fe and Ni being 0.25:2.75:1:1, adding two complexing agents of citric acid and ethylene diamine tetraacetic acid (EDTA), adding nitric acid and ammonia water for dissolving, adjusting PH to be 7-8, performing drying by distillation and sintering to form a powder, and performing pre-sintering for 3 hours under 1,200 DEG C to obtain air-electrode material powder. The material has favorable ion and electron conductivity and favorable electrochemical performance and is an air-electrode material which has favorable comprehensive performance and is suitable for middle and low temperatures.
Description
technical field [0001] The invention relates to the field of solid oxide fuel cells, in particular to a perovskite-like oxide air electrode material for medium and low temperature solid oxide fuel cells. Background technique [0002] As an efficient and clean energy conversion device, solid oxide fuel cell (SOFC) can directly convert chemical energy in fuel into electrical energy without being limited by the Carnot cycle. Reducing the operating temperature of SOFC will help to accelerate the commercialization of SOFC, and there will be a wider selection of materials. However, as the operating temperature of SOFC decreases, the ohmic resistance and polarization resistance of the battery increase greatly, of which the polarization resistance accounts for the majority. According to the oxygen reduction process, mixed ion and electron conductors can effectively expand the three-phase reaction interface and effectively accelerate the oxygen reduction process. Therefore, it is pa...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more