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

A-site doped K2NiF4 type cathode material of intermediate-low temperature solid oxide fuel cell

A fuel cell and cathode material technology, which is applied to solid electrolyte fuel cells, fuel cell parts, battery electrodes, etc., can solve the problems of reducing non-stoichiometric oxygen content, affecting the ionic conductivity of materials, and improving service life, The effect of improving ionic conductivity and improving electronic conductivity

Inactive Publication Date: 2009-12-02
UNIV OF SCI & TECH BEIJING
View PDF0 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

for la 2 NiO 4+δ system, currently the most studied is the A-site Sr-doped La 2-x Sr x NiO 4+δ , according to S.J.Skinner, J.A.Kilner, Oxygen diffusion and surface exchange in La 2-x Sr x NiO 4+δ , Solid State Ionics, 135(2000): 709, the incorporation of Sr, while improving the electronic conductivity, also reduces the non-stoichiometric oxygen content, thereby affecting the ionic conductivity of the material

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 doped K2NiF4 type cathode material of intermediate-low temperature solid oxide fuel cell
  • A-site doped K2NiF4 type cathode material of intermediate-low temperature solid oxide fuel cell
  • A-site doped K2NiF4 type cathode material of intermediate-low temperature solid oxide fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: La 1.7 Ca 0.3 NiO 4+δ Synthesis, conductivity testing and chemical compatibility testing of

[0014] Press La 1.7 Ca 0.3 NiO 4+δ The stoichiometric ratio, weigh an appropriate amount of La 2 o 3 ,. La 2 o 3 Dissolve in dilute nitric acid solution, then add Ni(NO 3 ) 2 ·6H 2 O, Ca(NO 3 ) 2 4H 2 O. According to the metal ion / citric acid ratio of 1:1.5, an appropriate amount of citric acid was weighed and dissolved in the above solution. Stir well, mix evenly, and evaporate in a water bath at 80°C to obtain a gel. Heating the gel to about 300°C, the gel burns to obtain the precursor powder. The precursor powder was calcined at 950°C for 8 hours to obtain the desired cathode powder material La 1.7 Ca 0.3 NiO 4+δ . The synthesized powder was added with 40% by volume of carbon powder and 2% by volume of PVA solution, mixed and dry-pressed, and the prepared sample was kept at 1350° C. for 5 hours to make a porous anode material.

[0015] The obt...

Embodiment 2

[0017] Example 2: La 1.8 Ca 0.2 NiO 4+δ Synthesis of Nitrate-Glycine Method and Preparation of Cathodic Membrane

[0018] Take La(NO 3 ) 3 ·6H 2 O, Ni(NO 3 ) 2 ·6H 2 O, Ca(NO 3 ) 2 4H 2 O is raw material, according to: La 1.8 Ca 0.2 NiO 4+δ The ratio of the elements weighed an appropriate amount of nitrate, dissolved in deionized water. At the same time, weigh glycine into the above solution according to the metal ion / glycine ratio of 1 / 1.5, stir and mix. Evaporate in a water bath at 70°C to obtain a green gel. Continue heating the gel to about 300°C, the gel burns to obtain the precursor powder. The above precursor was ground and calcined at 800 °C for 12 hours to obtain La 1.8 Ca 0.2 NiO 4+δ cathode material. Take a certain amount of powder, add 10% mass fraction of soluble starch and 1% mass fraction of ethyl cellulose, and finally add 1ml of deionized water, mix evenly and apply it evenly on the dense electrolyte fired at high temperature by screen prin...

Embodiment 3

[0019] Example 3: La 1.9 Ca 0.1 NiO 4+δ solid phase synthesis

[0020] Press La 1.9 Ca 0.1 NiO 4+δ The stoichiometric ratio of La 2 o 3 , basic nickel carbonate (analytical pure) and CaCO 3 (analytical pure). Pour the above materials into a ball mill jar, use agate balls as the grinding medium, and alcohol as the dispersant. After mixing and grinding for 5 hours, dry the mixed slurry, and then calcinate at 1100°C for 10 hours to obtain the tetragonal phase K 2 NiF 4 structured cathode material.

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

PropertyMeasurementUnit
Conductivityaaaaaaaaaa
Ionic conductivityaaaaaaaaaa
Login to View More

Abstract

The invention discloses an A-site doped K2NiF4 type cathode material of an intermediate-low temperature solid oxide fuel cell, which belongs to the field of fuel batteries. The A-site doped K2NiF4 type cathode material of the intermediate-temperature solid oxide fuel cell is characterized in that: the A-site of the K2NiF4 type La2NiO4+delta is doped with element Ca, and the molecular formula of the doped K2NiF4 type La2NiO4+delta is La2-x CaxNiO4+delta, wherein x is equal to 0.05 to 0.3. The cathode material of the invention can be used in the intermediate-low temperature solid oxide fuel cell, is stable and has excellent chemical compatibility with an electrolyte of GDC (Ce0.8Gd0.2O2). The doping of the Ca obviously increases electronic conductivity and greatly improves ionic conductivity at the same time. As the Ca raw material is low in price, so the introduction of the Ca reduces material cost.

Description

technical field [0001] The invention belongs to the field of fuel cells, and in particular relates to a tetragonal K doped A-site with stable performance, high electronic conductivity and high ion conductivity 2 NiF 4 Type La 2 NiO 4+δ Medium and low temperature solid oxide fuel cell cathode material. Background technique [0002] Reducing the operating temperature of solid oxide fuel cells and developing medium and low temperature solid oxide fuel cells have become the main trend in the field of solid oxide fuel cells. However, as the temperature decreases, the traditional cathode material LSM (La 1-x Sr x MnO 3-δ ) electrochemical catalytic activity decreased rapidly, and the polarization resistance increased sharply. When the temperature drops from 1000°C to 500°C, the polarization resistance increases about 2000 times. Cathode is an important part of SOFC, and its ohmic loss accounts for 60% of the ohmic loss of the whole battery. Therefore, the research and deve...

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
IPC IPC(8): H01M4/86H01M8/02H01M8/10
CPCY02E60/521Y02E60/50
Inventor 赵海雷沈永娜张翠娟徐南生
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