The present invention relates to a
solid oxide fuel
cell, which comprises: a plurality of tubular electrodes, reacting gases supplying means, and a preheat
piping. The tubular electrodes are concentrically arranged while enabling the polarity of a surface of any one of the plural electrodes is the same as that of the corresponding surface of a neighbor
electrode faced thereto; wherein each tubular
electrode further comprises an
anode layer, a
cathode layer, and a
solid electrolyte layer sandwiched between the
anode layer and the
cathode layer. The supplying reacting gases means is capable of supplying fuel and gas respectively to the
anode and
cathode of the tubular electrodes. The preheat
piping, connected to the supplying reacting gases means, collects the heat generated from the
combustion reaction of residual fuel and gas, which can be utilized to preheat the gases supplying reacting means. The
concentric electrode structure of the invention is compact and space saving, so that the efficiency per
unit volume of the fuel
cell adopting the same is enhanced. Moreover, by employing the referring fuel
cell as one power
generating unit, a fuel cell module can be formed by combining a plurality of the power generating units that the modularized design enables the fuel cell module to incorporate any amount of
fuel cells therein with flexible formation while enabling each fuel cell of the fuel cell module to be maintained and replaced with ease.