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A solid oxide fuel cell stack comprises a plurality of first modules and a plurality of second modules stacked alternately. Each first module comprises a first distribution member which defines internal passages for the supply of a first reactant to the fuel cells. The first distribution member is e

A solid oxide fuel cell stack comprises a plurality of first modules and a plurality of second modules stacked alternately. Each first module comprises a first distribution member which defines internal passages for the supply of a first reactant to the fuel cells. The first distribution member is enclosed by a porous support structure which carries the fuel cells on its two parallel surfaces. A plurality of passages are defined between the porous support structure and the first distribution member which distribute and remove the first reactant from the anodes. Each second module comprises a second distribution member which defines internal passages for the supply of a second reactant to the fuel cells. The passages in the first distribution member contain a catalyst for steam reforming the fuel. The catalyst is in intimate thermal contact with the fuel cells. Additionally a low temperature adiabatic preformer supplied with hydrocarbon fuel prereforms the fuel and supplies it to the passages.

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A solid oxide fuel cell stack comprising a plurality of solid oxide electrolyte members, each solid oxide electrolyte member having a first surface and a second oppositely facing surface, an anode electrode on the first surface of each solid oxide electrolyte member and a cathode electrode on the se

A solid oxide fuel cell stack comprising a plurality of solid oxide electrolyte members, each solid oxide electrolyte member having a first surface and a second oppositely facing surface, an anode electrode on the first surface of each solid oxide electrolyte member and a cathode electrode on the second opposite surface of each solid oxide electrolyte member to form a fuel cell, each anode electrode partially defining an anode chamber, each cathode electrode partially defining a cathode chamber, means to define passages internally of the solid oxide fuel cell stack, the passages supplying hydrogen to the anode chambers, the passages containing a catalyst suitable for steam reforming hydrocarbon fuel to hydrogen and other product gases, the means to define the passages being in intimate thermal contact with the solid oxide fuel cells such that waste heat from the solid oxide fuel cells provides the endothermic heat requirements for the steam reforming reaction, an adiabatic prereformer to convert heavier hydrocarbon fuels to methane, hydrogen and oxides of carbon and supplies the methane, hydrogen and oxides of carbon to the passages, means to supply oxidant to the cathode chambers, means to supply hydrocarbon fuel to the prereformer.