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One-dimensional SYCO cathode material and preparation method and method to prepare composite cathode by using the cathode material

A cathode material and composite cathode technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problem of large cathode interface polarization resistance, and achieve the effect of increasing interface length, good thermal shock resistance, and reducing sintering temperature

Inactive Publication Date: 2013-09-25
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a one-dimensional SYCO cathode material and its preparation method and a method for preparing a composite cathode using the cathode material in order to solve the problem of large polarization impedance at the cathode interface of the existing oxide fuel cell

Method used

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  • One-dimensional SYCO cathode material and preparation method and method to prepare composite cathode by using the cathode material
  • One-dimensional SYCO cathode material and preparation method and method to prepare composite cathode by using the cathode material
  • One-dimensional SYCO cathode material and preparation method and method to prepare composite cathode by using the cathode material

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specific Embodiment approach 1

[0021] Specific embodiment 1: The chemical formula of the one-dimensional SYCO cathode material in this embodiment is Sr 1-x Y x CoO 3-δ , where 0≤x≤1, the structure is one-dimensional nanofibers.

[0022] In this embodiment, the one-dimensional nanofibrous cathode material Sr 1-x Y x CoO 3-δ , where x takes 0≤x≤1, and where δ takes 0≤δ≤0.5, which is a perovskite structure material. The diameter of the one-dimensional nanofibrous cathode material is 200-300nm.

specific Embodiment approach 2

[0023] Specific embodiment two: the preparation method of the one-dimensional SYCO cathode material of this embodiment is implemented according to the following steps:

[0024] 1. According to the chemical formula Sr 1-x Y x CoO 3-δ , where 0≤x≤1, according to the molar ratio of Sr element, Y element and Co element as 1-x:x:1, respectively weigh strontium nitrate, yttrium nitrate and cobalt nitrate, then add strontium nitrate, yttrium nitrate and cobalt nitrate into N,N-dimethylformamide, magnetically stirred at room temperature until strontium nitrate, yttrium nitrate and cobalt nitrate are completely dissolved, and polyvinylpyrrolidone is added to stir to obtain an electrospinning precursor solution, and then electrospun to obtain nanofibers;

[0025] 2. Raise the temperature of nanofibers to 300°C at a rate of 2°C / min-10°C / min, sinter at a constant temperature for 1-2h, then continue to heat up to 700-1000°C, and continue sintering for 1-2h to obtain a one-dimensional SYC...

specific Embodiment approach 3

[0027] Embodiment 3: This embodiment differs from Embodiment 2 in that the total mass concentration of yttrium nitrate, strontium nitrate and cobalt nitrate in the electrospinning precursor solution described in step 1 is 15%. Other steps and parameters are the same as in the second embodiment.

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Abstract

The present invention discloses a one-dimensional SYCO cathode material and a preparation method and a method to prepare composite cathode by using the cathode material, and refers to a fuel cell cathode, a preparation method and the application thereof. The invention solves the problem of big interface polarized impedance of cathode material. The chemical formula of the one-dimensional nanometer fibrous SYCO cathode material is Sr1-xYxCoO3-Delta, and the SYCO cathode material is obtained through static spinning. The preparation of the composite cathode comprises the steps of a. preparing fibrous SYCO cathode slurry; b. coating the cathode slurry on an electrolyte and sintering to obtain an SYCO cathode skeleton; c. dipping the cathode skeleton in an electrolyte forerunner liquid and calcining to attach the electrolyte onto the cathode skeleton; and d. repeating step c to increase the electrolyte attached on the cathode skeleton gradually, and calcining to obtain composite cathode. The AC impedance of composite cathode obtained in the invention is up to 0.310 omega cm 2. The invention is mainly applied in solid oxide fuel cells.

Description

technical field [0001] The invention relates to a cathode material of a solid oxide fuel cell, a preparation method and an application method for preparing a composite cathode. Background technique [0002] Solid oxide fuel cell (SOFC) is an all-solid-state power generation device that directly converts chemical energy into electrical energy. composition. The solid oxide fuel cell has the advantages of high energy utilization rate, wide range of fuel sources, low noise, and no harmful gas emissions. It is a new energy system that efficiently utilizes existing fossil resources. [0003] The cathode of the solid oxide fuel cell, also known as the air electrode, is the electron receiver of the external electron conduction circuit. On the air electrode, oxygen in the air reacts with electrons to form O 2- , followed by a solid electrolyte (O 2- Ion conductor) is transported to the anode to react with the fuel, so that the SOFC completes the process of directly converting che...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88
CPCY02E60/50
Inventor 熊岳平刘连宝樊丽权王宇威赵力贾铮
Owner HARBIN INST OF TECH
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