Long-term tests of Ni–Zr0.9Sc0.1O1.95 anode impregnated with CeO2 in H2 + H2O gas mixtures

The present paper reports the data on the long-term monitoring (during 1500 h at 800 °С in the atmosphere of wet hydrogen and 40% H2 + 60% H2O) of Ni–Zr0.9Sc0.1O1.95 anode polarization resistance before and after its impregnation with cerium oxide. In wet hydrogen difference between the rates of polarization resistance degradation before and after impregnation is insignificant and reaches a level close to stationary one after 500 h of testing. In 40% H2 + 60% H2O gas mixture a behavior of the initial anode is similar to the above mentioned, whereas, the high rate of increase the polarization resistance of impregnated anode and sintering cerium oxide species was observed. After the long-term tests, the re-impregnation allows increasing the anode activity. The re-impregnation of anode increases its activity the higher, the greater of anode degraded during the long-term tests.