Method for one-step hydrothermal synthesis preparation of composite anode material of solid oxide fuel cell

A technology of solid oxide and composite cathode, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of reduced reactive sites, reduced three-phase interface, uneven cathode mixing, etc., to achieve improved performance, uniform distribution, and avoid The effect of active site reduction

Inactive Publication Date: 2016-07-20
山西师范大学
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Composite cathode materials are usually mechanically mixed by grinding two kinds of oxide powders. However, the cathode prepared by mechanical mixing has the problem of uneven mixing, which leads to the reduction of the three-phase interface, and the higher synthesis temperature makes the cathode materials different. The degree of sintering reduces the number of reactive sites

Method used

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  • Method for one-step hydrothermal synthesis preparation of composite anode material of solid oxide fuel cell
  • Method for one-step hydrothermal synthesis preparation of composite anode material of solid oxide fuel cell
  • Method for one-step hydrothermal synthesis preparation of composite anode material of solid oxide fuel cell

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of Mn by one-step hydrothermal synthesis 1.5 co 1.5 o 4 / SDC=50:50wt% composite cathode material, where Mn 1.5 co 1.5 o 4 is 0.0014mol, weigh 0.5147gMn(CH 3 COO) 2 4H 2 O (analytically pure), 0.6112gCo(NO 3 ) 2 ·6H 2 O (analytically pure), 0.6600gCe (NO 3 ) 3 ·6H 2 O (analytical grade), 0.1689gSm (NO 3 ) 3 ·6H 2 O (analytically pure), be dissolved in the deionized water of 50ml completely, stir 30min, then slowly drip the NaOH of 3mol / L and adjust the pH value of solution to be 10-11 under strong stirring state, continue to stir 30min, form uniform Suspension, transfer the precursor solution to a 200ml reaction kettle, seal it and place it in an oven to heat up to 180°C, keep it for 12h, then cool it down naturally, after the reaction is completed, filter the product, wash it, and dry it at 80°C for 6-7h. After uniform grinding, the cathode powder was collected, and the powder was characterized by XRD. figure 1 For the obtained XRD spectrum....

Embodiment 2

[0029] Preparation of Mn by one-step hydrothermal synthesis 1.5 co 1.5 o 4 / SDC=50:50wt% composite cathode material, where Mn 1.5 co 1.5 o 4 is 0.0014mol, weigh 0.5147gMn(CH 3 COO) 2 4H 2 O (analytically pure), 0.6112gCo(NO 3 ) 2 ·6H 2 O (analytically pure), 0.6600gCe (NO 3 ) 3 ·6H 2 O (analytical grade), 0.1689gSm (NO 3 ) 3 ·6H 2O (analytically pure), completely dissolved in the mixed solution of 26ml of deionized water and 40ml of absolute ethanol, stirred for 30min, then slowly added dropwise 25%-28% ammonia water under strong stirring and adjusted the pH value of the solution 10-11, continue to stir for 30 minutes to form a uniform suspension, transfer this precursor solution to a 100ml reaction kettle, seal it and place it in an oven to heat up to 180°C, keep it for 12 hours, and then cool it down naturally. The product is filtered, washed, dried at 80° C. for 6-7 hours, ground evenly and collected to obtain cathode powder.

[0030] Mn can also be prepare...

Embodiment 3

[0034] Preparation of NiFe by one-step hydrothermal synthesis 2 o 4 / SDC=50:50wt% composite cathode material, in which NiFe 2 o 4 is 0.006mol, weigh 1.7447gNi(NO 3 ) 2 ·6H 2 O (analytically pure), 4.848gFe (NO 3 ) 3 9H 2 O (analytically pure), 2.8137gCe (NO 3 ) 3 ·6H 2 O (analytically pure), 0.7200gSm (NO 3 ) 3 ·6H 2 O (analytically pure), completely dissolved in 60ml deionized water and stirred evenly. Take another beaker to weigh a certain amount of sodium hydroxide, dissolve it in deionized water, then add it dropwise into the mixed solution under vigorous stirring and adjust the pH value of the solution to 10-11, and continue stirring for 30 minutes to form a uniform suspension. For turbid liquid, transfer the precursor solution to a 100ml reaction kettle, seal it, place it in an oven and heat it up to 180°C, keep it for 12 hours, then cool it down naturally, after the reaction is completed, filter the product, wash it, dry it at 80°C for 6-7 hours, and grind...

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Abstract

The invention provides a method for one-step hydrothermal synthesis preparation of a composite anode material of a solid oxide fuel cell. The composite anode material synthesized according to the method belongs to a hybrid ion-electron conductor and is simultaneously provided with spinel electron conduction phase and a cubic fluorite ionic conduction phase, powder particle is relatively small in size and is uniformly distributed, the composite anode material has high dispersibility, high-temperature processing is not needed during the synthesis process, powder is prevented from being agglomerated during calcination, and the composite anode material is relatively high in reaction activity and can stably run in a low-temperature condition when applied to a single battery.

Description

technical field [0001] The invention relates to a solid oxide fuel cell composite cathode material, in particular to a method for preparing a solid oxide fuel cell composite cathode material by one-step hydrothermal synthesis. Background technique [0002] Solid oxide fuel cell (SOFC) is an electrochemical energy conversion device that can greenly and efficiently convert the chemical energy in existing fossil fuels into electrical energy, and can realize the application of cogeneration of heat and power. A traditional SOFC single cell includes a porous anode, an electrolyte, and a porous cathode, where the cathode is the main site for the oxygen reduction reaction. At present, the key to improving the performance of solid oxide fuel cells is to reduce the polarization loss of the cathode and the ohmic loss of the electrolyte. The electrolyte thin film technology is relatively mature, and the cathode polarization has become the main factor of battery loss. Therefore, seeking...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88
CPCH01M4/8803H01M4/8825Y02E60/50
Inventor 张丽敏
Owner 山西师范大学
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