In-situ precipitation method self-assembled core-shell structure nanoparticle modified perovskite oxide electrode material, preparation method and application thereof

A perovskite oxide, core-shell structure technology, applied in battery electrodes, structural parts, solid electrolyte fuel cells, etc., can solve problems such as poor catalytic activity, carbon deposition, particle agglomeration and growth, and achieve good controllability. Effect

Pending Publication Date: 2022-01-18
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

However, no nanoparticle-precipitated Sr reported in the literature 2 Fe 1.5 Mo 0.5 o 6-δ -GDC cathode material (H.Lv, Y.Zhou, X.Zhang, Y.Song, Q.Liu, G.Wang, X.Bao, Infiltration of Ce 0.8 Gd 0.2 o 1.9 nanoparticles onSr 2 Fe 1.5 Mo 0.5 o 6 -delta cathode for CO 2 electroreduction in solid oxide electrolysis cell, Journal of Energy Chemistry, 35(2019) 71-78.) In carbon dioxide electrolysis at 800°C, 1.4V is only 0.263mA cm -2
And the Sr with NiFe alloy modification 2.0 Fe 1.35 Mo 0.45 Ni 0.2 o 6-d –Gd 0.2 Ce 0.8 o 1.9 The electrolysis current of the material is also only 0.619mA cm -2
show poor performance
[0005] However, as an anode for solid oxide fuel cells, perovskite oxides not only exhibit poorer catalytic activity than Ni-based materials, but also face the challenge of carbon deposition.
Electrodes of perovskite oxide coated with metal nanoparticles still have problems of particle agglomeration and a small amount of carbon deposition because the metal nanoparticles are directly exposed on the surface

Method used

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  • In-situ precipitation method self-assembled core-shell structure nanoparticle modified perovskite oxide electrode material, preparation method and application thereof
  • In-situ precipitation method self-assembled core-shell structure nanoparticle modified perovskite oxide electrode material, preparation method and application thereof
  • In-situ precipitation method self-assembled core-shell structure nanoparticle modified perovskite oxide electrode material, preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A cathode material for a solid oxide electrolytic cell with high carbon dioxide electrolysis performance, the specific structure is FeO-coated NiFe alloy core-shell structure nanoparticles modified (PrSr) 2 (NiFeMo) 2 o 6-δ Double perovskite oxide composites.

[0037] (1) Press Pr 0.4 Sr 1.6 Ni 0.2 Fe 1.3 Mo 0.5 o 6-δ (PSNFM) Stoichiometric ratio Take praseodymium nitrate, strontium carbonate, nickel nitrate, ferric nitrate and molybdenum acid and dissolve them in deionized water, then add the corresponding weight of citric acid and EDTA. Aqueous ammonia was added dropwise to adjust the pH value to 8. Stir and heat until a sol is obtained, and then dehydrate in an oven at 250° C. to obtain a xerogel. The dry gel was ground and calcined at 1200° C. for 10 h to obtain a pure-phase perovskite precursor powder. XRD analysis shows that the precursor is a phase-pure double perovskite structure, such as figure 1 shown.

[0038] (2) Place part of the powder in step...

Embodiment 2

[0045] A solid oxide fuel cell anode material with anti-coking ability, the specific structure is FeO coated NiFe alloy core-shell structure nanoparticles modified (PrSr) 2 (NiFeMo) 2 o 6-δ (R-PSNFM) double perovskite oxide composites:

[0046] (1) By solid-phase method, according to stoichiometric ratio Pr 0.4 Sr 1.6 Ni 0.2 Fe 1.3 Mo 0.5 o 6-δ (PSNFM) Weigh praseodymium oxide, strontium carbonate, nickel oxide, iron oxide and molybdenum oxide with absolute ethanol, mix them by ball milling for 24 hours, and then sinter at 1200°C for 12 hours to form a phase to obtain a perovskite precursor powder. The obtained perovskite oxide has a precursor at 900 degrees 97% H 2 -H 2 The reduction pretreatment under O atmosphere for 2 hours resulted in R-PSNFM. After surface reduction by XRD analysis, the material maintained a double perovskite structure and NiFe alloy peaks appeared. SEM analysis also shows that a large number of nanoparticles are uniformly dispersed on the surf...

Embodiment 3

[0054] A kind of solid oxide electrolytic cell cathode material with high carbon dioxide electrolysis efficiency, specific molecular formula is (Pr 0.8 Sr 1.2 ) 0.95 Ni 0.2 Fe 1.3 Mo 0.5 o 6-δ .

[0055] (1) Press (Pr 0.8 Sr 1.2 ) 0.95 Ni 0.2 Fe 1.3 Mo 0.5 o 6-δ (PSNFM) stoichiometric ratio Weigh praseodymium nitrate, strontium carbonate, nickel nitrate, ferric nitrate and molybdenum acid and dissolve them in deionized water, then add the corresponding weight of citric acid and EDTA. Aqueous ammonia was added dropwise to adjust the pH value to 8. Stir and heat until a sol is obtained, and then dehydrate in an oven at 250° C. to obtain a xerogel. The dry gel was ground and then calcined at 1200° C. for 10 h to obtain a pure-phase double perovskite precursor powder. XRD analysis showed that the precursor was a phase-pure double perovskite structure.

[0056] (2) Place part of the powder in step (1) directly under 97% H at 800°C 2 -H 2 The reduced powder (R-PSN...

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Abstract

The invention discloses an in-situ precipitation method self-assembled core-shell structure nanoparticle modified perovskite oxide electrode material, a preparation method and application thereof. The preparation method comprises the steps: preparing a perovskite oxide precursor, and obtaining core-shell structure nanoparticles of NiFe alloy coated with ion oxide FeO through an in-situ reduction precipitation method, wherein the nanoparticles are loaded on the surface of the perovskite oxide. According to the invention, the electrode material is applied to a cathode of a solid oxide electrolytic cell for high-temperature carbon dioxide electrolysis, so that the catalytic activity of the cathode material to carbon dioxide is effectively improved; as the anode of the solid oxide fuel cell, the electrode material has high fuel oxidation performance, and can improve the carbon deposition resistance; and the method has the characteristics of simple preparation, controllable conditions and obviously improved performance, and has wide application prospects in the field of preparation of solid oxide electrolytic cell cathodes and solid oxide fuel cell anodes.

Description

technical field [0001] The invention belongs to the technical field of solid oxide electrolytic cell and solid oxide fuel cell, and specifically relates to an in-situ precipitation method self-assembled core-shell structure nano particle modified perovskite oxide electrode material and its preparation method and application. [0002] technical background [0003] With the rapid development of industrialization, human beings have intensified the development and utilization of energy, which has also caused serious environmental problems. It is an effective solution to find energy conversion devices with high energy conversion efficiency and environmental friendliness. A solid oxide fuel cell is an efficient energy conversion device that converts fuel (H 2 , CH 4 , C 3 h 8 etc.) to convert chemical energy into electrical energy and store it. The solid oxide electrolytic cell converts electrical energy into chemical energy, such as electrolyzing water and (CO 2 ) system H ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M8/10H01M8/1016
CPCH01M4/8657H01M4/8828H01M8/1016H01M8/10Y02E60/50
Inventor 杨成浩谭婷
Owner SOUTH CHINA UNIV OF TECH
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