anode is kept unchanged the gas introduced to the cathode is co 2 instead and the ocv and the v i p and composition and concentration of reaction products co 2 co o 2 at the cathode are tested and recorded respectively at 840 u00b0 c 890 u00b0 c and 938 u00b0 c it is confirmed that co 2 may be used as cathode oxidant gas of the first sofc suggesting that co 2 g u2192 co g u00bdo 2 g is feasible to be performed at the cathode and o 2 may be successfully provided in progression of electrochemical reaction and be used for current generation experimental results are as shown in fig6 7 a 7 b 7 c 7 d 8 and 9 and the correctness of the system and the feasibility of sofc co 2 ecc are confirmed co concentration may be up to 27 83 mol that is conversion of co 2 0 2783 and o 2 concentration is 0 in one reaction pass indicating that o 2 generated in cracking of co 2 is completely depleted at the cathode afterwards step 34 is performed in which after the cell performance test is completed the gas flow rate is lowered the anode is maintained in a reduction atmosphere and cooled to room temperature at a temperature drop rate of 1 u00b0 c min generally lower than 3 u00b0 c min and then the fed gases are completely closed thus the main test of the system is completed finally step 35 is performed in which the cell performance data is analyzed to identify the feasible achievement of the sofc.