Anode material for a high temperature fuel cell

Robert Gilles (Inventor), Andreas Kaiser (Inventor), Emad Batawi (Inventor)

Research output: Patent

78 Downloads (Pure)

Abstract

Anode material for a fuel cell which is to be operated at a high temperature above 700 DEG C., which said anode material being a porous composite material with a heterogeneous phase of solid materials which is formed by two reticular systems which penetrate each other in interlaced manner of particles connected by sintering, namely a first reticular system of ceramic material, and also a second reticular system of metallic material for the purpose of bringing about redox processes and an electrical conductivity, characterised in that the first reticular system is composed of large and small ceramic particles ( 10, 11 ) with average diameters d50 greater than 5 mum or smaller than 1 mum respectively, in that 50 to 80% of the first reticular system is formed from the large ceramic particles ( 10 ),; and in that a composition of the anode material to be used is given by values which are selected by means of samples of this material and a test method, wherein the test method includes at least one redox cycle, an irreversible change in length of the selected sample adopting in this a value smaller than 0.002, preferably smaller than 0.0005, and the following measurements and evaluations being carried out per redox cycle at a temperature which is at least the same as the operating temperature of the fuel cell: A linear elongation of the sample is measured in the oxidised state of the second reticular system and a value L1 is determined. The second reticular system is reduced, is oxidised again after at least one hour, and a value L2 of the linear elongation is determined for the newly oxidised state.; One obtains the specific value of the irreversible change in length as the ratio (L1-L2):L1.
Original languageEnglish
IPCB22F3/11
Patent numberUS7691524 B2
Filing date29/03/2004
CountryUnited States
Publication statusPublished - 2004
Externally publishedYes

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