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Intermediate-temperature solid oxide fuel cell (LSCF) cathode material with brownmillerite structure

A fuel cell cathode and solid oxide technology, which is applied to battery electrodes, structural parts, circuits, etc., and can solve problems such as inappropriate cathode materials

Inactive Publication Date: 2010-08-04
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing cathode materials are not suitable for working under medium temperature conditions;

Method used

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  • Intermediate-temperature solid oxide fuel cell (LSCF) cathode material with brownmillerite structure
  • Intermediate-temperature solid oxide fuel cell (LSCF) cathode material with brownmillerite structure
  • Intermediate-temperature solid oxide fuel cell (LSCF) cathode material with brownmillerite structure

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specific Embodiment approach 1

[0007] Specific embodiment 1: In this embodiment, the general formula of the composition of the cathode material of the medium temperature solid oxide fuel cell with the mayorite structure is A 2 Fe 2-x M x O 5±δ , where A is the main group of alkaline earth metals, M is a transition metal element, 0.1<x<1.0, δ=0~0.01.

[0008] The cathode material of the medium-temperature solid oxide fuel cell of the mayorite structure in this embodiment is prepared by the glycine-nitrate method.

specific Embodiment approach 2

[0009] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the A is Ca, Sr or Ba. Others are the same as the first embodiment.

specific Embodiment approach 3

[0010] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that M is Co, Mn or Ni. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to an intermediate-temperature solid oxide fuel cell (LSCF) cathode material with a brownmillerite structure, which belongs to the field of intermediate cathode materials. The invention solves the problem that the traditional cathode material is not suitable for working at moderate temperature. The product has the general formula of A2Fe2-xMxO5+ / -delta, wherein A is main group alkaline-earth metal, M is a transition metal element, x is larger than 0.1 and smaller than 1.0, and delta is equal to 0-0.01. The product expresses high oxygen ion and electron mixed electrical conductivity and low electrode polarization resistance at 500-800 DEG C, and a cathode polarization overpotential numerical value is smaller than that of the LSCF cathode material with a brownmillerite structure. The material is used as a cathode and expresses favorable thermal and chemical stability and oxygen catalytic reduction property below 800 DEG C. The product has a thermal expansion coefficient approaching to a solid electrolyte SDC material and is suitable for being used as a cathode material of the LSCF.

Description

technical field [0001] The invention belongs to the field of cathode materials; in particular, it relates to a cathode material of a medium-temperature solid oxide fuel cell with a mayorite structure. Background technique [0002] As a new type of energy conversion device, solid oxide fuel cells are increasingly being paid attention to by countries because of their high efficiency and cleanliness. Traditional SOFCs suffer from poor stability and short life due to their high operating temperature (around 1000°C). The development of medium-temperature solid oxide fuel cells has become one of the hotspots in its research field. However, the catalytic activity of the electrode decreased rapidly with the decrease of the reaction temperature, and the polarization resistance increased. Traditional high temperature solid oxide battery cathode material La l-x Sr x MnO 3 (LSM) is no longer suitable for mid-temperature solid oxide fuel cells due to its lower electrical conductivit...

Claims

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Application Information

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IPC IPC(8): H01M4/86
CPCY02E60/50
Inventor 李强赵辉霍丽华程晓丽
Owner HEILONGJIANG UNIV
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