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
CN101794885AInactive Publication Date: 2010-08-04HEILONGJIANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HEILONGJIANG UNIV
Publication Date
2010-08-04
Estimated Expiration
Not applicable · inactive patent

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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.
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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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