Unlock instant, AI-driven research and patent intelligence for your innovation.

Bismuth ion doped layered double perovskite cathode material and preparation method thereof

A double perovskite, material structure technology, applied in battery electrodes, solid electrolyte fuel cells, structural parts, etc., can solve problems such as hindering the commercialization of perovskite materials, declining electrochemical performance, and insufficient commercial utilization. The effect of improving oxygen exchange performance, performance enhancement, good electrochemical performance

Pending Publication Date: 2022-07-19
CHANGCHUN UNIV OF SCI & TECH
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As a new energy material, the perovskite-type rare earth composite oxide, as a mixed ion and electron conductor, still has good oxygen exchange capacity at lower temperatures, and also exhibits lower polarization resistance and better catalytic activity. Therefore, It has been widely studied, but the reason that hinders the commercialization of perovskite materials is the problem of unbalanced performance. For example, when the performance is good, the stability is poor; the thermal expansion coefficient is reduced, and the electrochemical performance will decrease when the stability is improved. , although layered double perovskites have improved this problem to some extent compared with ordinary perovskites, they are still insufficient for commercial use.

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
  • Bismuth ion doped layered double perovskite cathode material and preparation method thereof
  • Bismuth ion doped layered double perovskite cathode material and preparation method thereof
  • Bismuth ion doped layered double perovskite cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Nd 1-x Bi x BaCo 2 O 5+δ (x=0.1, NBBC0.1) Preparation of double perovskite powders.

[0024] The specific preparation process is as follows:

[0025] (1) 0.9 mol of Nd weighed according to the composition 2 O 3 Rare earth oxides were preheated at 800 °C for 2 hours, and an appropriate amount of nitric acid was added dropwise at 100~150 °C to heat and stir to completely dissolve to form Nd(NO 3 ) 3 solution, with 0.1 mol Bi (NO 3 ) 33 ,1molBa(NO 3 ) 2 ,2molCo(NO 3 ) 2 ∙6H 2 O other medicines are weighed according to the stoichiometric ratio of 0.9:0.1:1:2 and then added to an appropriate amount of deionized water for sealing and preservation;

[0026] (2) formulate all the medicines, calculate the amount of glycine according to the ratio of G / N=0.54, and put it into other solutions to form a mixed solution;

[0027] 8.1Nd(NO 3 ) 3 +0.9Bi(NO 3 ) 3 +9Ba(NO 3 ) 2 +18Co(NO 3 ) 2 ∙6H 2 O+44C 2 H 5 NO 2 =9Nd 0.9 Bi 0.1 BaCo 2 O 5+δ +62...

Embodiment 2

[0030] Example 2: Nd 1-x Bi x BaCo 2 O 5+δ (x=0.05, NBBC0.05) Preparation of double perovskite powder:

[0031] (1) 0.95mol Nd after weighing according to the composition 2 O 3 Rare earth oxides were preheated at 800 °C for 2 hours, and an appropriate amount of nitric acid was added dropwise at 100~150 °C to heat and stir to completely dissolve to form Nd(NO 3 )3 solution. with 0.05molBi (NO 3 ) 33 ,1molBa(NO 3 ) 2 ,2molCo(NO 3 ) 2 ∙6H 2 O other medicines are weighed according to the stoichiometric ratio of 0.95:0.05:1:2 and then added to an appropriate amount of deionized water for sealing and preservation;

[0032] (2) formulate all the medicines, calculate the amount of glycine according to the ratio of G / N=0.54, and put it into other solutions to form a mixed solution;

[0033] 8.65Nd(NO 3 ) 3 +0.45Bi(NO 3 ) 3 +9Ba(NO 3 ) 2 +18Co(NO 3 ) 2 ∙6H 2 O+44C 2 H 5 NO 2 =9Nd 0.95 Bi 0.05 BaCo 2 O 5+δ +62.5N 2 +88CO 2 +218H 2 O

[0034] (3) Place th...

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 belongs to the field of solid oxide fuel cells, and particularly relates to an A-site Bi-doped modified layered double perovskite material and a preparation method thereof. The structural formula of one material is Ln1-xBixBaCo2O5 + delta, wherein delta is a value enabling the compound of the chemical formula to maintain electric neutrality. The material is prepared by adopting a glycine nitrate method, the process is simple, and expensive experimental instruments are not needed. The material obtained by the invention has the characteristics of excellent oxygen exchange capacity and catalytic activity, sintering temperature reduction, excellent stability and the like, can obtain a solid oxide fuel cell material with high electrochemical performance and stable long-time operation, and is beneficial to reduction of cell cost.

Description

technical field [0001] The invention relates to the technical field of solid oxide fuel cells, in particular to a double perovskite structure medium-temperature solid oxide fuel cell cathode material and a preparation method thereof. Background technique [0002] As a new energy source with high efficiency and utilization rate, solid oxide fuel cells have a long way to be commercialized due to the deterioration of battery performance due to the reaction of electrodes and electrolytes at high temperatures, and the poor long-term operational stability of batteries. to go. [0003] As a new energy material, perovskite-type rare earth composite oxides, as mixed ion and electronic conductors, still have good oxygen exchange capacity at lower temperatures, and also show lower polarization resistance and better catalytic activity. Therefore, It has been widely studied, but the reason that hinders the commercialization of perovskite materials is the problem of unbalanced performanc...

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): H01M4/90H01M4/88H01M8/10
CPCH01M4/9016H01M4/9033H01M4/8825H01M8/10H01M2008/1293
Inventor 金芳军刘小伟孙宁李金华徐铭泽楚学影翟英娇沈羽王芳
Owner CHANGCHUN UNIV OF SCI & TECH