Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A-site layered perovskite type electrode material and preparation method thereof

An electrode material and perovskite-type technology, which is applied in the field of A-site layered perovskite-type electrode materials and its preparation, can solve the problems of fuel gas and oxidant catalytic activity that are not very ideal, so as to improve redox catalytic activity, The effect of increasing the conductivity and increasing the concentration of oxygen vacancies

Inactive Publication Date: 2018-10-12
UNIV OF SCI & TECH BEIJING
View PDF5 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalytic activity of the above-mentioned electrode materials for fuel gas and oxidant is still not very ideal.

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
  • A-site layered perovskite type electrode material and preparation method thereof
  • A-site layered perovskite type electrode material and preparation method thereof
  • A-site layered perovskite type electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Synthesis of LnBaMn by Citric Acid-Combustion Method 2-x m x o 5+δ (Ln=Sm, M=Mn) Dense sample. According to SmBaMn 2 o 5+δ Stoichiometric ratio preparation, the Sm 2 o 3 , Ba(NO 3 ) 2 、C 4 h 6 MnO 4 4H 2 Dissolve O in deionized water respectively, add citric acid at a ratio of 1:2 to metal ions and citric acid, add EDTA at a ratio of 1:1 to metal ions and EDTA and stir continuously to form a uniform solution, and add ammonia water Adjust the pH value of the solution to 3. Then obtain a homogeneous sol in a water bath at 50°C, place the sol in an oven at 100°C to obtain a dry gel, and then heat it at 300°C until it spontaneously burns to form a very fluffy SmBaMn 2 o 5+δ Precursor powder. Grind the powder, put it into a high-temperature furnace for roasting, the temperature is 800°C, and the holding time is 12 hours, so that the organic matter in it is fully decomposed. The above powders were ground and placed in a tube furnace at H 2 Treat in a mixed ga...

Embodiment 2

[0034] Synthesis of LnBaMn by Citric Acid-Combustion Method 2-x m x o 5+δ (Ln=Nd, M=Fe, x=0.2) Dense sample. According to NdBaMn 1.8 Fe 0.2 o 5+δ Stoichiometric ratio preparation, the Nd 2 o 3 , Ba(NO 3 ) 2 、C 4 h 6 MnO 4 4H 2 O and Fe(NO 3 ) 3 9H 2 Dissolve O in deionized water respectively, add citric acid at a ratio of 1:2 to metal ions and citric acid, add EDTA at a ratio of 1:1 to metal ions and EDTA and stir continuously to form a uniform solution, and use ammonia water Adjust the pH of the solution to 8. Then obtain a uniform sol in a water bath at 100°C, heat the sol in an oven at 50°C to obtain a dry gel, and then heat it at 200°C until it spontaneously burns to form a very fluffy NdBaMn 1.8 Fe 0.2 o 5+δ Precursor powder. Grind the powder, put it into a high-temperature furnace for roasting, the temperature is 1200°C, and the holding time is 4 hours, so that the organic matter in it can be fully decomposed. The above powders were ground and placed...

Embodiment 3

[0036] Synthesis of LnBaMn by Citric Acid-Combustion Method 2-x m x o 5+δ (Ln=Gd, M=Co, x=0.5) electrode powder. According to GdBaMn 1.5 co 0.5 o 5+δ Stoichiometric preparation, the Gd 2 o 3 , Ba(NO 3 ) 2 、C 4 h 6 MnO 4 4H 2 O, Co(NO 3 ) 2 ·6H 2 Dissolve O in deionized water respectively, add citric acid at a ratio of 1:2 to metal ions and citric acid, add EDTA at a ratio of 1:1 to metal ions and EDTA and stir continuously to form a uniform solution, and use ammonia water Adjust the pH of the solution to 6. Then obtain a uniform sol in a water bath at 70°C, place the sol in an oven at 80°C to obtain a dry gel, and then heat it at 240°C until it self-combusts to form a very fluffy GdBaMn 1.5 co 0.5 o 5+δ Precursor powder. Grind the powder, put it into a high-temperature furnace for roasting, the temperature is 1100°C, and the holding time is 10h, so that the organic matter in it can be fully decomposed. The above powders were ground and placed in a tube fur...

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

No PUM Login to View More

Abstract

The invention discloses an A-site layered perovskite type electrode material and a preparation method thereof, belonging to the technical field of solid oxide fuel cells. By utilizing the high oxygenion conductivity property of the A-site layered perovskite oxide, and the multivalent state and the anti-reduction property of the B-site Mn ion, the invention synthesizes and prepares a symmetric electrode material with stable structure and excellent electrochemical performance. Through the doping of B-site transition metal ions (Fe, Co, Ni), the catalytic activity of the material is further controlled. The molecular formula of the electrode material is: LnBaMn2xMxO5+delta, wherein Ln is equal to Sm, Gd, Nd, M is equal to Mn, Fe, Co, Ni, x is not less than 0 and not greater than 2, and deltais not less than 0 and not greater than 1. The electrode material is classified into a dense electrode material and a porous film type electrode material. The presence of A-site ions provides sufficient oxygen vacancy concentration for the material, which contributes to the improvement of the ionic conductivity of the material. The selected transition metal elements, with low-cost feature and lower metal-oxygen strengthening feature, may further improve oxygen vacancy concentration in the grid. At the same time, the d-electron features of the elements may also enhance the catalytic activity ofthe material.

Description

technical field [0001] The invention belongs to the technical field of solid oxide fuel cells, in particular to an A-site layered perovskite type (AA'B 2 o 5+δ ) solid oxide fuel cell electrode material LnBaMn 2 o 5+δ (Ln=Sm, Gd, Nd), and doping the Mn site with transition metal M (M=Mn, Fe, Co, Ni), significantly improved the catalytic activity of the material to fuel gas and oxidant, and obtained a The structure is stable in reducing atmosphere, and it can be used as the electrode material LnBaMn for the cathode and anode of solid oxide fuel cells at the same time 2- x m x o 5+δ (Ln=Sm, Gd, Nd, M=Mn, Fe, Co, Ni, 0≤x≤2, 0≤δ≤1). The material can be prepared by solid phase method and sol-gel combustion method. Background technique [0002] The current direct combustion of fossil fuels has caused huge environmental problems. In order to solve environmental pollution and alleviate the greenhouse effect, countries around the world are actively developing new energy tech...

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
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90
CPCH01M4/8825H01M4/9033Y02E60/50
Inventor 赵海雷张旸杜志鸿李魁李科云张赛赛
Owner UNIV OF SCI & TECH BEIJING
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com