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Anticarbon dioxide solid oxide fuel cell cathode material and preparation method thereof

A fuel cell cathode and solid oxide technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as corrosion and performance attenuation, and achieve the effects of overcoming severe attenuation, excellent stability, and good oxygen reduction catalytic activity

Pending Publication Date: 2021-12-17
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under operating conditions, SOFC cathodes are often in the air environment, and are susceptible to corrosion by water vapor and carbon dioxide, resulting in performance attenuation. Therefore, the development of cobalt-free, high-activity, and high-stability cathodes is currently a hot spot in this research field.

Method used

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  • Anticarbon dioxide solid oxide fuel cell cathode material and preparation method thereof
  • Anticarbon dioxide solid oxide fuel cell cathode material and preparation method thereof
  • Anticarbon dioxide solid oxide fuel cell cathode material and preparation method thereof

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preparation example Construction

[0029] The present invention provides a method for preparing a solid oxide fuel cell cathode material described in any one of the above technical solutions, comprising:

[0030] A) dissolving Sr salt, Mn salt and Fe salt in dilute acid, adding citric acid and ethylenediaminetetraacetic acid, adjusting the pH value, stirring the reaction to obtain a reaction mixture;

[0031] B) continue heating the reaction mixture to obtain a precursor;

[0032] C) Calcining the precursor to obtain a solid oxide fuel cell cathode material.

[0033] The preparation method of the solid oxide fuel cell cathode material provided by the invention first dissolves Sr 2+ salt, soluble Mn 2+ Salt and Soluble Fe 3+ The salts were dissolved in dilute acid in sequence, and then citric acid and ethylenediaminetetraacetic acid were added.

[0034] The Sr salt of the present invention is preferably Sr(NO 3 ) 2 , the Mn salt is preferably (CH 3 COO) 2 Mn 4H 2 O; the Fe salt is preferably Fe(NO 3 ) ...

Embodiment 1

[0054] SrFe 0.9 mn 0.05 o 3-δ Powder preparation

[0055] Weigh Fe(NO 3 ) 3 9H 2 O (analytical pure) 19.19g, Sr (NO 3 ) 2 (analytical pure) 10.5815g and (CH 3 COO) 2 Mn 4H 2 O (analytical pure) 0.6127g is dissolved in dilute nitric acid solution, then adds citric acid (analytical pure) 31.521g and EDTA (analytical pure) 29.224g, drips ammoniacal liquor to adjust the pH value of the solution to be 7, and obtains a mixed solution; Use a magnetic stirrer to stir for two hours; use a heating furnace to heat the solution until it spontaneously ignites to obtain the battery cathode material—SrFe 0.95 mn 0.05 o 3-δ Precursor powder; calcining the precursor powder in a high-temperature sintering furnace at 1000°C for 2 hours to obtain the battery cathode material—SrFe 0.95 mn 0.05 o 3-δ Powder material.

Embodiment 2

[0057] SrFe 0.9 mn 0.1 o 3-δ Powder preparation

[0058] Weigh Fe(NO 3 ) 3 9H 2 O (analytical pure) 18.18g, Sr (NO 3 ) 2 (analytical pure) 10.5815g and (CH 3 COO) 2 Mn 4H 2 O (analytical pure) 1.2255g is dissolved in dilute nitric acid solution, then adds citric acid (analytical pure) 31.521g and EDTA (analytical pure) 29.224g, drips ammoniacal liquor and adjusts the pH value of the solution to be 7 to obtain a mixed solution; Use a magnetic stirrer to stir for two hours; use a heating furnace to heat the solution until it spontaneously ignites to obtain the battery cathode material—SrFe 0.9 mn 0.1 o 3-δ Precursor powder; calcining the precursor powder in a high-temperature sintering furnace at 1000°C for 2 hours to obtain the battery cathode material—SrFe 0.9 mn 0.1 o 3-δ Powder material.

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Abstract

The invention provides a solid oxide fuel cell cathode material. The chemical formula of the cathode material is SrFe1-xMnxO3-delta, and x is not less than 0.05 and not more than 0.5. According to the cathode material disclosed by the invention, the SrFeO3-delta material is converted from a tetragonal phase to a cubic phase at room temperature by doping low-valence elements at a B site, has good oxygen reduction catalytic activity, shows excellent anti-carbon dioxide stability, and overcomes the defect that a common cathode is severely attenuated in a carbon dioxide-containing atmosphere; and the cathode material is an excellent carbon dioxide-resistant cathode material for the solid oxide fuel cell.

Description

technical field [0001] The invention relates to the technical field of solid oxide fuel cells, in particular to a solid oxide fuel cell cathode material and a preparation method thereof. Background technique [0002] Solid oxide fuel cell (SOFC) is a new generation of clean and efficient energy conversion device, which can directly convert chemical energy into electrical energy, and has high energy conversion efficiency because it is not limited by the Carnot cycle. The main polarization loss of anode-supported SOFC comes from the cathode, so the cathode needs to have excellent catalytic activity for the oxygen reduction reaction (ORR). Classical cathode materials such as Sm 0.5 Sr 0.5 CoO 3-δ , La 0.6 Sr 0.4 co 0.8 Fe 0.2 o 3-δ , Ba 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3-δ etc. are all cobalt-based materials with excellent performance. However, the disadvantages of cobalt-based materials are also very obvious, such as high thermal expansion coefficient, which does not ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/90H01M4/88
CPCH01M4/9033H01M4/8885H01M2004/8684Y02E60/50
Inventor 宦道明张璐夏长荣彭冉冉
Owner UNIV OF SCI & TECH OF CHINA
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