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A medium-temperature solid oxide fuel cell composite cathode and preparation method thereof

A solid oxide, fuel cell technology, applied in solid electrolyte fuel cells, fuel cells, battery electrodes, etc., can solve problems such as hindering oxygen ion and electron transport, uneven dispersion of SP and RP two phases, and achieving a simple process. , the effect of improving oxygen surface exchange efficiency and improving electrochemical performance

Active Publication Date: 2022-07-05
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the uneven dispersion of SP and RP two-phase in the existing solid-phase method hinders the transport of oxygen ions and electrons

Method used

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  • A medium-temperature solid oxide fuel cell composite cathode and preparation method thereof
  • A medium-temperature solid oxide fuel cell composite cathode and preparation method thereof
  • A medium-temperature solid oxide fuel cell composite cathode and preparation method thereof

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Effect test

Embodiment 1

[0037] A preparation method of a medium temperature solid oxide fuel cell cathode, the specific steps are:

[0038] 1. Prepare SP:

[0039] (1) Using commercially available lanthanum nitrate (La(NO) with a purity of 99.9% 3 )3 ), strontium nitrate (Sr(NO 3 ) 2 ), cobalt nitrate (Co(NO 3 ) 2 ) and ferric nitrate (Fe(NO 3 ) 3 ) for the reaction raw materials to be dissolved in deionized water and stirred into solutions of 0.4mol / L, 1.2mol / L, 0.4mol / L, and 0.4mol / L, respectively. The concentration of each metal ion can be determined by chemical analysis, according to the molecular formula La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ , 37.50mL, 8.33mL, 12.50mL, 50.00mL of the four kinds of metal ion salt solutions were taken in order, poured into a 500mL beaker and mixed evenly to obtain a mixed solution, and then added deionized water to 250mL to obtain a metal ion concentration of 0.1mol / L of mother liquor;

[0040] (2) 150mL of precipitant (a solution of ammonium bicarbonate...

Embodiment 2

[0046] A preparation method of a medium temperature solid oxide fuel cell cathode, the specific steps are:

[0047] 1. Preparation of RP:

[0048] (1) Using commercially available lanthanum nitrate (La(NO) with a purity of 99.9% 3 ) 3 ), strontium nitrate (Sr(NO 3 ) 2 ), cobalt nitrate (Co(NO 3 ) 2 ) and ferric nitrate (Fe(NO 3 ) 3 ) for the reaction raw materials to be dissolved in deionized water and stirred into solutions of 0.4mol / L, 1.2mol / L, 0.4mol / L, and 0.4mol / L, respectively. The concentration of each metal ion can be determined by chemical analysis, according to the molecular formula LaSrCo 0.2 Fe 0.8 O 4-δ , 62.50mL, 20.83mL, 12.50mL, 50.00mL of the four metal ion salt solutions were taken in order, poured into a 500mL beaker and mixed evenly to obtain a mixed solution, and then added deionized water to 250mL to obtain a metal ion concentration of 0.1 mol / L mother liquor;

[0049] (2) 150mL of precipitant (a solution of ammonium bicarbonate and ammonia w...

Embodiment 3

[0054] A preparation method of a composite cathode of a medium temperature solid oxide fuel cell, the specific steps are:

[0055] 1. Prepare SP:

[0056] (1) Using commercially available lanthanum nitrate (La(NO) with a purity of 99.9% 3 ) 3 ), strontium nitrate (Sr(NO 3 ) 2 ), cobalt nitrate (Co(NO 3 ) 2 ) and ferric nitrate (Fe(NO 3 ) 3 ) for the reaction raw materials to be dissolved in deionized water and stirred into solutions of 0.4mol / L, 1.2mol / L, 0.4mol / L, and 0.4mol / L, respectively. The concentration of each metal ion can be determined by chemical analysis, according to the molecular formula La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ , 37.50mL, 8.33mL, 12.50mL, 50.00mL of the four kinds of metal ion salt solutions were taken in order, poured into a 500mL beaker and mixed evenly to obtain a mixed solution, and then added deionized water to 250mL to obtain a metal ion concentration of 0.1mol / L of mother liquor;

[0057] (2) 150mL of precipitant (a solution of amm...

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Abstract

The invention discloses a composite cathode of a medium temperature solid oxide fuel cell and a preparation method thereof. The composite cathodes are represented by the molecular formula La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3‑δ and LaSrCo 0.2 Fe 0.8 O 4‑δ A composite of two materials. The preparation method is as follows: preparing a cationic solution containing La, Sr, Co and Fe ions according to the molecular formula; adding a precipitant to the cationic solution for reaction, and the obtained precipitating solution is aged, filtered, washed and dried in an oven, and then sieved , calcined to obtain SP and RP powders; the powders were ball-milled and coated on both sides of the SDC electrolyte sheet, and then calcined. The impedance of the obtained cathode is basically stable at 0.1Ωcm within 100h of open circuit operation at 750℃ 2 , which reduces the preparation cost and impedance of the composite cathode material, and has high stability.

Description

technical field [0001] The invention relates to a preparation method of a high-performance composite cathode material for medium-temperature solid oxide fuel cells, and belongs to the field of preparation of solid oxide fuel cells. Background technique [0002] Solid Oxide Fuel Cell (SOFC) is an all-solid-state chemical power generation device that directly converts chemical energy stored in fuel and oxidant into electrical energy with high efficiency and environmental friendliness at medium and high temperature. Since electrodes are prone to sintering problems at high temperatures, SOFC research in recent years has focused on reducing the operating temperature to moderate temperatures (600–800 °C) to improve service life. However, the traditional cathode materials of SOFC have poor activity for electrochemical reduction of oxygen at moderate temperature, and the overall efficiency of the cell is low. This is due to the larger radius of alkaline earth metal cations on the A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88H01M8/12H01M8/1213
CPCY02E60/50
Inventor 周鼎付佳佳舒梦雅王智敏祁华贝尹屹梅
Owner SHANGHAI INST OF TECH