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Graphene-modified nickel-base composite anode material of solid oxide fuel cell and preparation method thereof

A solid oxide and graphene modification technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems such as nickel catalyst sintering growth, battery performance degradation, battery structure damage, etc., to improve interface contact and improve electrode quality. Activity, effect of reducing polarization impedance

Active Publication Date: 2013-08-07
SHAANXI COAL & CHEM TECH INST
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Problems solved by technology

[0005] Since the Ni-YSZ anode is sintered at high temperature (generally greater than 1350°C) to ensure the compactness of the film, and the high Ni content (about 50wt.%) leads to the particle size of Ni in the anode at the micron level, resulting in In traditional anodes, the interface contact between nickel and electrolyte materials is not good, and the nickel catalyst is easy to sinter and grow during the reduction process, resulting in low anode activity and serious carbon deposition; and during the long-term operation of the battery, the gap between Ni and NiO The cycle transformation between them will lead to a large volume change, which will seriously damage the battery structure and lead to a decrease in battery performance.

Method used

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  • Graphene-modified nickel-base composite anode material of solid oxide fuel cell and preparation method thereof

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[0038] The preparation method of the solid oxide fuel cell nickel-based composite anode material modified by graphene of the present invention comprises the following steps:

[0039] 1) Preparation of nickel-based composite anode material:

[0040] Take the following three methods to composite nickel metal salt, oxide or hydroxide, YSZ and graphene oxide into a nickel-based composite anode material;

[0041] ①Compound NiO with graphene oxide, and then compound with YSZ:

[0042] Composite nickel metal salt, oxide or hydroxide and graphene oxide by means of impregnation, mechanical mixing and / or high-temperature solid-state reaction, and then compound the obtained NiO / graphene oxide composite with YSZ.

[0043] ②Compound NiO with YSZ, and then compound with graphene oxide:

[0044] Composite nickel metal salt, oxide or hydroxide and YSZ by means of impregnation, mechanical mixing and / or high-temperature solid-state reaction, and then composite the obtained NiO / YSZ composite wit...

Embodiment 1

[0068] 1) Using the thermal decomposition method of nitrate to compound nickelate and graphene oxide and then compound with YSZ to prepare nickel-based composite anode material:

[0069] Weigh 2g graphene oxide and 32.173g Ni(NO 3 ) 2 ·6H 2 O, add 100ml of absolute ethanol, ultrasonically disperse for 2h, ball mill at 450r / min for 3.5h, and decompose at 700°C to obtain a mixture of 2g of graphene oxide and 8g of nickel oxide. Then mix with 6.668g of YSZ (the molar content of yttrium oxide in YSZ is 8%) (the mass ratio of graphene oxide to NiO is 0.25:1, and the mass ratio of (NiO+graphene oxide):YSZ is 60:40) , add 5g of organic binder (such as PVB and n-butanol (1:1 by weight) solvent, the amount is 30% of the total weight of the anode) to the powder, mix and grind thoroughly to obtain a nickel-based composite anode material.

[0070] 2) Determination of the volume expansion rate of graphene oxide modified composite anode materials:

[0071] Add an organic adhesive (such ...

Embodiment 2

[0076] 1) Using the method of thermal decomposition of nitrate, compound nickelate and YSZ and then compound with graphene oxide to prepare nickel-based composite anode material:

[0077] Take by weighing 34.182g nickel nitrate (Ni(NO 3 ) 2 ·6H 2 O) and 15.3g of ScSZ (the molar content of scandium oxide in ScSZ is 0.05%) was added to 100ml of absolute ethanol, ultrasonically dispersed for 2h, ball milled at a speed of 450r / min for 3.5h, and decomposed at 1100°C to obtain 8.5g of NiO and 15.3 Composite of ScSZ of g. Mix this composite with 1.7g graphene oxide (the mass ratio of graphene oxide to NiO is 0.2:1, and the mass ratio of (NiO+graphene oxide): YSZ is 40:60) and grind them evenly. Add 8g of organic adhesive (such as PVB and n-butanol (1:1 by weight) solvent, the dosage is 30% of the total weight of the anode) and mix and grind thoroughly to obtain a nickel-based composite anode material.

[0078] 2) Determination of the volume expansion rate of graphene oxide modifi...

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Abstract

The invention discloses a graphene-modified nickel-base composite anode material of a solid oxide fuel cell and a preparation method thereof. The modified nickel-base composite anode material is prepared by compounding metal salt, an oxide or hydroxide of metal, YSZ ((Yttria Stabilized Zirconia) and graphene oxide, and then a battery assembly is prepared by compounding the nickel-base composite anode material and an electrolyte material. Through testing the performance of the battery assembly, the performance of the battery assembly is greatly improved in comparison with a battery with an un-modified anode. The graphene oxide is added in a conventional nickel-base anode material for modifying the anode material, the reduced graphene is capable of stopping nickel particles from sintering and growing, and the surface appearance of the material is improved. The graphene-modified nickel-base composite anode material has the characteristics of uniformity in particle distribution, difficulty in sintering, high strength, small volume expansion ratio, stable structure and the like; and the cyclic oxidation-reduction resisting capability of the nickel-base anode material is improved. The application of the anode material has important significance to the promotion of the application of a nickel-base anode solid oxide fuel cell technology.

Description

technical field [0001] The invention relates to a solid oxide fuel cell (SOFC), in particular to a graphene-modified nickel-based solid oxide fuel cell composite anode material and a preparation method thereof. Background technique [0002] In 2004, Andre Geim and Konstantin Novoselov, physicists at the University of Manchester in the United Kingdom, successfully separated graphene from graphite and confirmed that it could exist alone. They jointly won the 2010 Nobel Prize in Physics for the groundbreaking experiment of three-dimensional graphene materials. [0003] Graphene is a carbon molecule composed of carbon atoms arranged in a hexagonal shape and connected to each other, and its structure is very stable. It has high conductivity, high toughness, high strength and super large specific surface area. The thickness of graphene is only 0.335 nanometers, which is not only thin but also very hard; as a single substance, the migration speed of electrons in graphene reaches ...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/88
CPCY02E60/50
Inventor 张云付东升杨阳
Owner SHAANXI COAL & CHEM TECH INST
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