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One-dimensional nanometer fiber base Ni-GDC composite anode materials and preparation method thereof

A technology of nanofibers and composite anodes, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of anode performance attenuation, etc., and achieve large three-phase interface, good combination, and shape retention Effect

Inactive Publication Date: 2014-01-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a one-dimensional nanofiber-based Ni-GDC composite anode to solve the problem that the nickel agglomeration phenomenon occurs under the high-temperature working condition of the battery when the existing nickel-based anode uses carbon-based fuel, resulting in attenuation of the anode performance. Materials and their preparation methods

Method used

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  • One-dimensional nanometer fiber base Ni-GDC composite anode materials and preparation method thereof
  • One-dimensional nanometer fiber base Ni-GDC composite anode materials and preparation method thereof
  • One-dimensional nanometer fiber base Ni-GDC composite anode materials and preparation method thereof

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specific Embodiment approach 1

[0024] Embodiment 1: The one-dimensional nanofiber-based Ni-GDC composite anode material of this embodiment is to adhere Ni nanoparticles on the surface of GDC nanofibers; wherein the chemical formula of GDC is Ce 0.8 Gd 0.2 o 1.9 .

[0025] The schematic diagram of Ni-GDC cermet anode structure in the prior art is as figure 1 As shown, 1 is GDC and 2 is Ni particles. Although GDC as a scaffold maintains the dispersion and porosity of the Ni metal phase to a certain extent, it cannot meet the commercial requirements of an ideal anode using carbon-based materials as fuel. . Using carbon-based fuel, the structure mode of the existing Ni-GDC cermet anode causes obvious agglomeration of Ni, and the Ni particles agglomerate into large particles, which interrupts the electron conduction path and eventually leads to the failure of the anode performance. decay to failure. The schematic diagram of the structure of the one-dimensional nanofiber-based Ni-GDC composite anode material...

specific Embodiment approach 2

[0026] Embodiment 2: This embodiment differs from Embodiment 1 in that the mass ratio of GDC to Ni is 1: (0.3-0.7). Others are the same as the first embodiment.

[0027] The one-dimensional nanofiber-based Ni-GDC composite anode material of this embodiment is that Ni nanoparticles are adhered to the surface of GDC nanofibers, and the Ni particles present a continuous and uneven distribution form, which effectively reduces the degree of agglomeration of Ni particles and avoids The phenomenon that the three-phase interface is reduced, so as to achieve the purpose of improving the electrochemical performance of the anode.

specific Embodiment approach 3

[0028] Specific embodiment three: the preparation method of the one-dimensional nanofiber-based Ni-GDC composite anode material described in specific embodiment one is carried out according to the following steps:

[0029] 1. According to the chemical formula Ce 0.8 Gd 0.2 o 1.9 , respectively weigh cerium nitrate and gadolinium nitrate according to the molar ratio of Ce and Gd elements of 4:1, then add cerium nitrate and gadolinium nitrate to N,N-dimethylformamide, and magnetically stir at room temperature until Cerium nitrate and gadolinium nitrate are completely dissolved, then polyvinylpyrrolidone is added and stirred to obtain an electrospinning precursor solution, and then electrospinning is performed to obtain nanofibers;

[0030] 2. Sinter the nanofibers at a constant temperature of 280-300°C at a heating rate of 2-5°C / min for 2-3 hours, then continue to heat up to 500-1000°C at a heating rate of 2-5°C / min, and sinter at a constant temperature 2 to 3 hours to obtain...

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Abstract

The invention discloses one-dimensional nanometer fiber base Ni-GDC composite anode materials and a preparation method thereof, and relates to middle-low temperature solid oxide fuel cell anode materials and the preparation method thereof. The one-dimensional nanometer fiber base Ni-GDC composite anode materials and the preparation method thereof are used for solving the problem that anode performance of a nickel base anode degrades, wherein the problem is caused by the nickel united phenomenon generated when carbon-base fuel is used by the nickel base anode on the high-temperature cell working condition. According to the one-dimensional nanometer fiber base Ni-GDC composite anode materials and the preparation method thereof, GDC nanometer fibers are prepared through the electrostatic spinning technology and the calcination method, nickel is plated on the surface of the GDC nanometer fibers, and the one-dimensional nanometer fiber base Ni-GDC composite anode materials are obtained. According to the one-dimensional nanometer fiber base Ni-GDC composite anode materials, the nickel particles plated on the surface of the GDC ceramic fibers are good in dispersibility, the nickel and ceramics have good associative property, the nickel united degree can be effectively reduced by the electrode manufactured by the one-dimensional nanometer fiber base Ni-GDC composite anode, and the one-dimensional nanometer fiber base Ni-GDC composite anode materials and the preparation method thereof can be applied to the field of middle-low temperature solid oxide fuel batteries.

Description

technical field [0001] The invention relates to a medium-low temperature solid oxide fuel cell anode material and a preparation method thereof. Background technique [0002] Solid oxide fuel cell (SOFC), as an energy conversion method different from traditional energy sources, is gradually attracting the attention of various countries. The anode is an indispensable and important part of the fuel cell circuit system, and the SOFC provides fuel gas through the anode. The choice of anode material and the design of microstructure directly affect the working characteristics of SOFC, so it is particularly important to study high-performance anodes. The performance of the anode is mainly reflected in the size of the three-phase interface, that is, the contact position of the fuel electrode-electrolyte-fuel. The larger the three-phase interface (interface area composed of electrolyte-fuel-anode), the more electrode reaction sites. In theory, the electrode The performance will be h...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88
CPCB82Y30/00B82Y40/00H01M4/8652H01M4/8803H01M4/8817H01M4/8853Y02E60/50
Inventor 熊岳平李栋曲红丽樊丽权王宇威于超
Owner HARBIN INST OF TECH
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