Rapid degradation phenomenon of NiCu-Ce sub(0.8Gd) sub(0).2O sub(1.9 anode at high p(H) sub(2)O) in different concentrations of dry methane

Degradation phenomena of Ni sub(0.5Cu) sub(0).5-CGO (Ce sub(0.8Gd) sub(0).2O sub(1.9) bimetallic anode in different concentrations of dry methane were studied in LSM ((La) sub(0).75Sr sub(0.25)) sub(0).95MnO sub(3-I)&nda sh; CGO cathode supported SOFCs. According to XRD, SEM and EIS analyses, the degradation of the Ni) sub(0).5Cu sub(0.5-CGO bimetallic anode could be mainly attributed to re-oxidation of Ni by H) sub(2)O and/or by rapid sintering of Ni due to a high p(H sub(2O) appeared at a high current density. Furthermore, it is found that the degradation of anode resulted by the re-oxidation of Ni and/or by rapid sintering of Ni in the as-prepared cells generally occurred when the partial pressure ratio of the produced H) sub(2)O and CH sub(4 at the outlet of anode increased above a threshold value in different concentrations of dry methane.)