Chemical stability of Y-doped Ba(Ce,Zr)O3 perovskites in H2S-containing H2

ZnO-doped BaZr0.85Y0.15O3−δ proton-conducting electrolytes: Characterization and fabrication of thin films

“…The BZY-Zn samples sintered at 1450 • C and 1500 • C exhibited bulk activation energy values (0.31 eV) similar to that for ZnOfree BZY15 sintered at 1650 • C (0.37 eV) [32]. However, samples of BZY-Zn sintered at 1500 • C exhibited much lower grains boundary activation energy values (about 0.31 eV) than pure BZY15 sintered at 1650 • C (1.07 eV) [32].…”

The effects of NiO addition on the structure and transport properties of proton conducting BaZr0.8Y0.2O3−

“…BZY exhibits high proton conductivity and good chemical stability towards H 2 O, CO 2 , and H 2 S [4]. However, the refractory nature of BZY necessitates high sintering temperature (>1600°C) and long annealing time (>24 h) for densification, which lead to evaporation of barium and subsequent segregation of Y 2 O 3 , resulting in a decrease of proton conductivity [3,5,6].…”

H2S poisoning and regeneration of Ni–BaZr0.1Ce0.7Y0.2O3−δ at intermediate temperature

“…4b shows the XRD pattern obtained from the feed side surface of Ni-BZCY after testing in 60 ppm H 2 S at 973 K. A little Ni 3 S 2 , BaS, and doped CeO 2 were found after testing. The formation of BaS and doped CeO 2 suggests that BaCeO 3 reacts with H 2 S [9,14]:…”

“…There are few research results on the stability of BaCeO 3 in H 2 S. Recently, Li et al [14] have studied the chemical stability of BaCe 0.85−x Zr x Y 0.15 O 3−ı in 5000 ppm H 2 S at 723-973 K. In this condition, BaZr 0.85 Y 0.15 O 3−ı was stable whereas BaCe 0.85 Y 0.15 O 3−ı was unstable. Our results show that the reaction between H 2 S and BaCeO 3 may also be enhanced at intermediate temperature because it is thermodynamically favored at lower temperatures [9].…”