51 and 52 in an air tight manner therefore a plurality of air passages 10 are defined in one of the central recesses 51 for the oxidizing gas and a plurality of similar fuel gas passages 11 are defined in the other of the central recesses 52 for the fuel gas the anodic bonding is now described in the following example an electrode layer 9 and a layer 8 of heat resistant and hard glass for instance made of pyrex glass tradename are formed along the entire peripheral surface of the grid frame 21 of the electrolyte layer 2 on each side thereof by sputtering and a similar electrode layer 9 is formed along the entire peripheral part of the opposing surface of each distribution plate 5 then typically with this assembly heated to about 400 u00b0 c at which sodium ions in the glass become fairly mobile an electric field is produced in the assembly so as to move ions in the fuel cell assembly of the present invention if the electrolyte includes a solid polymer heating the entire assembly to the temperature of 400 u00b0 c may damage the solid electrolyte therefore according to this embodiment a heater not shown is placed under the electrode layer 9 to selectively heat only the peripheral part of the flow distribution plates 5 the heater may include polycrystalline silicon sandwiched between insulating layers such as si 3 n 4 layers if the electrode terminal layer 55 and.