Intermediate-temperature solid oxide fuel cell one-dimensional nano composite cathode and preparation method thereof

A solid oxide, fuel cell technology, applied in battery electrodes, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problem of high cathode polarization resistance

Active Publication Date: 2012-08-01
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the technical problem of high cathode polarization resistance prepared by the existing LSCF / GDC composite powder, and provides a one-dimensional nano-composite cathode of a medium-temperature solid oxide fuel cell and a preparation method thereof

Method used

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  • Intermediate-temperature solid oxide fuel cell one-dimensional nano composite cathode and preparation method thereof
  • Intermediate-temperature solid oxide fuel cell one-dimensional nano composite cathode and preparation method thereof
  • Intermediate-temperature solid oxide fuel cell one-dimensional nano composite cathode and preparation method thereof

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specific Embodiment approach 1

[0027] Specific embodiment 1: The one-dimensional nanocomposite cathode of a medium temperature solid oxide fuel cell in this embodiment is based on Ce 0.8 Gd 0.2 O 1.9 (GDC) The electrolyte sheet is the substrate, and the surface of the substrate is coated with nanorod-like La 0.8 Sr 0.2 Co 0.2 Fe 0.8 O 3 Powder, and La 0.8 Sr 0.2 Co 0.2 Fe 0.8 O 3 Ce attached to nanorods 0.8 Gd 0.2 O 1.9 Nano particles.

[0028] The one-dimensional nanocomposite cathode of the intermediate temperature solid oxide fuel cell of this embodiment is to prepare nanofibers by electrospinning. After the fibers are sintered, a rod-like structure powder is obtained, and the rod-like structure powder is mixed with GDC nanopowders Then, a slurry is prepared and coated on the GDC electrolyte sheet, and after sintering, a one-dimensional nanocomposite cathode of a medium temperature solid oxide fuel cell is obtained. On the cathode, the one-dimensional rod-shaped LSCF and GDC nano-combination extend the elect...

specific Embodiment approach 2

[0029] Specific implementation manner 2: The preparation method of a one-dimensional nanocomposite cathode of an intermediate temperature solid oxide fuel cell of this embodiment is carried out in the following steps:

[0030] 1. Electrospinning precursor liquid preparation: According to the molar ratio of lanthanum nitrate, iron nitrate, cobalt nitrate and strontium nitrate of 4:4:1:1, weigh lanthanum nitrate, iron nitrate, cobalt nitrate and strontium nitrate respectively. Add to N,N-dimethylformamide, magnetically stir until the nitrate is completely dissolved, then add polyvinylpyrrolidone, and stir at room temperature for 4h-6h to obtain an electrospinning precursor solution; among them, the electrospinning precursor solution The mass percentage of nitrate is 15%-25%, and the mass percentage of polyvinylpyrrolidone is 8%-12%;

[0031] 2. Electrospinning to prepare nanofibers: the electrospinning precursor obtained in step 1 is added to the syringe, and a flat stainless steel i...

specific Embodiment approach 3

[0036] Specific embodiment three: This embodiment is different from the specific embodiment two in that the mass ratio of the terpineol solution of LSCF nanorod powder and ethyl cellulose in step four is 1:1. Others are the same as the second embodiment.

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Abstract

Disclosed are an intermediate-temperature solid oxide fuel cell one-dimensional nano composite cathode and a preparation method thereof, which relate to an intermediate-temperature solid oxide fuel cell cathode and a preparation thereof and resolve the technical problem of high resistance of exiting lanthanum strontium cobalt ferrite (LSCF) / gadolinia doped ceria (GDC) composite powder cathode polarization. Ce0.8Gd0.2O1.9 electrolyte sheets serve as a matrix of the cathode, the surface of the cathode is coated with nano rod shaped La0.8Sr0.2Co0.2Fe0.8O3 powder, and Ce0.8Gd0.2O1.9 nano granules are attached to a nano rod. The preparation method includes the steps of preparing nitrate to be a precursor solution, sintering after electrostatic spinning, obtaining nano rod shaped powder, coating the powder on electrolyte sheets for sintering, permeating a mixture liquid of gadolinium nitrate and cerium nitrate, and obtaining products after sintering; or mixing LSCF nano rod shaped powder and Ce0.8Gd0.2O1.9 nano powder to coat on electrolyte sheets for sintering, and obtaining products. The cathode and the preparation method thereof are used for intermediate-temperature solid oxide fuel cells.

Description

Technical field [0001] The invention relates to a cathode of an intermediate temperature solid oxide fuel cell and a preparation method thereof. Background technique [0002] As a new energy source with great development potential, solid oxide fuel cell has the advantages of high energy conversion rate, low environmental pollution, and wide range of available fuels, and has attracted more and more attention. In the current situation of increasingly fierce international competition, research and development of new energy sources are particularly important. As a new type of energy source, solid oxide fuel cell research is of great significance. [0003] Due to the high operating temperature of the solid oxide fuel cell, there are fewer materials available and high production cost, which hinders its commercial development. One of the keys to reducing the operating temperature of the solid oxide fuel cell is to reduce the polarization loss of the electrode. Many studies have shown tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88B82Y30/00B82Y40/00
CPCY02E60/50
Inventor 熊岳平赵二庆刘连宝刘晓天刘连谭罗林
Owner HARBIN INST OF TECH
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