Preparation method of mid-low temperature solid oxide fuel cell cathode material

A fuel cell cathode, solid oxide technology, applied in solid electrolyte fuel cells, battery electrodes, circuits, etc., can solve problems such as poor electrical conductivity and large thermal expansion coefficient, and achieve enhanced dissociation and adsorption capacity and extended service life. , the effect of ohmic resistance and polarization resistance reduction

Inactive Publication Date: 2017-01-11
董晓
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem mainly solved by the present invention: in view of the defects of large thermal expansion coefficient and poor electrical conductivity in the current traditional battery cathode materials, this method first mixes praseodymium nitrate hexahydrate and copper nitrate trihydrate, then adds citric acid, and sinters at high temperature Made Pr 2 CuO 4 powder, then mixed with gadolinium oxide, cerium nitrate hexahydrate, citric acid, etc., calcined, ball milled with lithium oxide and absolute ethanol, and finally mixed with Pr 2 CuO 4 The powder mixture is pressed and molded, and sintered to obtain the cathode material of the medium-low temperat

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0015] Example 1

[0016] First, weigh 8.4g praseodymium nitrate hexahydrate and 2.4g copper nitrate trihydrate, add 80mL deionized water, stir and mix well at 300r / min, add 5.8g citric acid, heat and evaporate to the original volume in a constant temperature water bath at 80℃ 1 / 8 to obtain a viscous colloid, then place the viscous colloid in a muffle furnace and bake at 180°C for 10-15 minutes to obtain oxide powder; add the above oxide powder to the muffle furnace, Calcined at 500°C for 2h, then place it in a mortar and grind it through a 300-mesh sieve. Put the sieved oxide powder into a high-temperature furnace and sinter it at 800°C for 8h to obtain Pr 2 CuO 4 Powder, spare; weigh 3.2g gadolinium oxide into 50mL 20% sulfuric acid solution, stir at 300r / min for 15min, add 20g cerium nitrate hexahydrate, continue to stir until the solid is completely dissolved, add 9.6g citric acid, at 80 In a constant temperature water bath at ℃, heat and evaporate to 1 / 8 of the original volu...

Example Embodiment

[0017] Example 2

[0018] First, weigh 10.2g praseodymium nitrate hexahydrate and 3.0g copper nitrate trihydrate, add 90mL deionized water, stir and mix uniformly at 350r / min, add 7.0g citric acid, heat and evaporate to the original volume in a constant temperature water bath at 90℃ 1 / 8 to obtain a viscous colloid, and then place the viscous colloid in a muffle furnace and bake at 190°C for 10-15 minutes to obtain oxide powder; add the above oxide powder to the muffle furnace, Calcined at 600℃ for 3h, then place it in a mortar and grind it through a 300-mesh sieve. Put the sieved oxide powder into a high-temperature furnace and sinter it at 850℃ for 9h to obtain Pr 2 CuO 4 Powder, spare; weigh 3.4g gadolinium oxide into 65mL 20% sulfuric acid solution, stir at 350r / min for 17min, add 21g cerium nitrate hexahydrate, continue stirring until the solid is completely dissolved, add 10.4g citric acid, Heat and evaporate to 1 / 8 of the original volume under a constant temperature water b...

Example Embodiment

[0019] Example 3

[0020] First, weigh 12.6g praseodymium nitrate hexahydrate and 3.6g copper nitrate trihydrate, add 100mL deionized water, stir and mix uniformly at 400r / min, add 8.7g citric acid, heat and evaporate to the original volume in a constant temperature water bath at 100℃ 1 / 8 to obtain a viscous colloid, then put the viscous colloid in a muffle furnace and bake at 200°C for 10-15 minutes to obtain oxide powder; add the above oxide powder to the muffle furnace, Calcined at 700℃ for 4h, then place it in a mortar and grind it through a 300-mesh sieve. Put the sieved oxide powder into a high-temperature furnace and sinter it at 900℃ for 10h to obtain Pr 2 CuO 4 Powder, ready for use; Weigh 3.6g gadolinium oxide into 80mL 20% sulfuric acid solution, stir at 400r / min for 20min, add 22g cerium nitrate hexahydrate, continue stirring until the solid is completely dissolved, add 11.5g citric acid, In a constant temperature water bath at ℃, heat and evaporate to 1 / 8 of the orig...

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Abstract

The invention discloses a preparation method of a mid-low temperature solid oxide fuel cell cathode material, and belongs to the technical field of cell cathode materials. The method comprises the steps of firstly mixing praseodymium nitrate hexahydrate with copper nitrate trihydrate evenly, then adding a citric acid and carrying out high-temperature sintering to prepare Pr2CuO4 powder; mixing a gadolinium oxide with cerium nitrate hexahydrate, the citric acid and the like, burning the mixture and then carrying out ball-milling on the mixture, a lithium oxide and absolute ethyl alcohol to form powder; and finally carrying out mixing and compression molding on the powder and the Pr2CuO4 powder and carrying out sintering to obtain the mid-low temperature solid oxide fuel cell cathode material. An electrolyte material of a cell is formed by doping metal elements of praseodymium, cerium, gadolinium and the like and the oxygen vacancy concentration is greatly improved, so that the ionic conductivity is improved and the defect of a relatively large thermal expansion coefficient change of the cell cathode material under high temperature operation is compensated. An example proves that the obtained mid-low temperature solid oxide fuel cell cathode material is relatively stable in property under a mid-low temperature condition and has good conductivity, and the service lifetime of the cell is prolonged.

Description

technical field [0001] The invention discloses a method for preparing a cathode material of a medium-low temperature solid oxide fuel cell, and belongs to the technical field of cathode materials for batteries. Background technique [0002] Fossil energy has made great contributions to human progress, and will still play an extremely important role in the development of human society in the next few decades. However, with the rapid development of human civilization, over-exploitation and inefficient use of fossil energy have caused worldwide energy shortages and serious environmental pollution problems. Before successfully developing clean alternative energy sources, more rational and efficient use of existing energy resources is of great significance for the healthy and sustainable development of modern society. As an electrochemical energy conversion device, the fuel cell directly converts the chemical energy in the fuel into electrical energy, and has the outstanding adv...

Claims

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Application Information

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IPC IPC(8): H01M8/10H01M4/86H01M4/88H01M4/90
CPCH01M4/86H01M4/88H01M4/9016H01M8/10Y02E60/50Y02P70/50
Inventor 董晓宋豪陆娜
Owner 董晓
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