TY - JOUR
T1 - Rock salt ordered-type double perovskite anode materials for solid oxide fuel cells
AU - Zheng, Kun
AU - Świerczek, Konrad
AU - Zaja̧c, Wojciech
AU - Klimkowicz, Alicja
N1 - Funding Information:
The project was funded by the National Science Centre Poland (NCN) on the basis of the decision number DEC-2011/03/N/ST5/04785.
PY - 2014/4/1
Y1 - 2014/4/1
N2 - B-site rock salt-type ordered double perovskites Sr2 - xBa xMMoO6 - δ (M = Co, Ni; x = 0, 0.5, 1, 1.5 and 2) were evaluated as novel anode materials for SOFC fuel cells. Phase composition, crystal structure, oxygen content, transport properties, chemical stability in relation to ceria electrolyte and chemical stability of Sr 2 - xBaxMMoO6 - δ under reducing atmospheres were studied. It was found that Sr2CoMoO 6 - δ and Sr2NiMoO6 - δ possess I4/m symmetry at room temperature, while all other anode materials are cubic with Fm-3m space group. SrBaMMoO6 - δ oxides exhibit thermal expansion coefficient in the range 11.7-14.3 · 10- 6 K - 1, which is comparable to that of Ce0.8Gd 0.2O1.9 electrolyte. All Sr2 - xBa xMMoO6 - δ oxides show low electrical conductivity in air (ca. 10- 3-10- 1 S cm- 1 at 800 C). Stability studies performed in reducing conditions indicate that these materials decompose at temperatures lower than 800 C in 5 vol.% H2 in Ar and lower than 700 C in pure H2, which suggests that previous literature data showing enhanced conductivity in reducing conditions may not be entirely correct. Interestingly, despite total decomposition of the anode material, relatively high performance of constructed SOFCs was recorded. Moreover, addition of Ni to the anode caused an increase of power density up to 0.16 W cm- 2 at 850 C.
AB - B-site rock salt-type ordered double perovskites Sr2 - xBa xMMoO6 - δ (M = Co, Ni; x = 0, 0.5, 1, 1.5 and 2) were evaluated as novel anode materials for SOFC fuel cells. Phase composition, crystal structure, oxygen content, transport properties, chemical stability in relation to ceria electrolyte and chemical stability of Sr 2 - xBaxMMoO6 - δ under reducing atmospheres were studied. It was found that Sr2CoMoO 6 - δ and Sr2NiMoO6 - δ possess I4/m symmetry at room temperature, while all other anode materials are cubic with Fm-3m space group. SrBaMMoO6 - δ oxides exhibit thermal expansion coefficient in the range 11.7-14.3 · 10- 6 K - 1, which is comparable to that of Ce0.8Gd 0.2O1.9 electrolyte. All Sr2 - xBa xMMoO6 - δ oxides show low electrical conductivity in air (ca. 10- 3-10- 1 S cm- 1 at 800 C). Stability studies performed in reducing conditions indicate that these materials decompose at temperatures lower than 800 C in 5 vol.% H2 in Ar and lower than 700 C in pure H2, which suggests that previous literature data showing enhanced conductivity in reducing conditions may not be entirely correct. Interestingly, despite total decomposition of the anode material, relatively high performance of constructed SOFCs was recorded. Moreover, addition of Ni to the anode caused an increase of power density up to 0.16 W cm- 2 at 850 C.
KW - Anode materials
KW - Cation ordering
KW - Chemical stability
KW - Double perovskite
KW - Solid oxide fuel cells
UR - http://www.scopus.com/inward/record.url?scp=84893244945&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84893244945&partnerID=8YFLogxK
U2 - 10.1016/j.ssi.2014.01.030
DO - 10.1016/j.ssi.2014.01.030
M3 - Article
AN - SCOPUS:84893244945
SN - 0167-2738
VL - 257
SP - 9
EP - 16
JO - Solid State Ionics
JF - Solid State Ionics
ER -