Electrochemical reactor units and modules and systems composed of them

An electrochemical reactor unit, comprising tube-type electrochemical reactor cells,

• a porous material body having a heat releasing function and a current collecting function, and
• a fuel supply means,
• wherein the tube-type electrochemical reactor cells comprise tubes with a micro-size diameter, have a tube structure, and are housed in the porous material body,
• wherein a plurality of the electrochemical reactor cells have a gas seal member and a collector member attached to said porous material body, and are electrically connected in series and one-dimensionally in a direction in which the tube-type electrochemical reactor cells are arranged, and
• wherein the fuel supply means is mounted to the connected electrochemical reactor cells.