학술논문
Ce_(0.9)Sr_(0.1)Cr_(0.5)Mn_(0.5)O_(3-δ) as the anode materials for solid oxide fuel cells running on H_2 and H_2S
Document Type
Article
Author
Source
Korean Journal of Chemical Engineering, 28(8), 137, pp.1764-1769 Aug, 2011
Subject
Language
English
ISSN
1975-7220
0256-1115
0256-1115
Abstract
Perovskite-type Ce_(0.9)Sr_(0.1)Cr_(0.5)Mn_(0.5)O_(3-δ) (CSCMn) was synthesized and evaluated as anode for solid oxygen fuel cells based on Ce_(0.8)Sm_(0.2)O_(1.9) (SDC). The conductivities of CSCMn were evaluated with DC four-probe method in 3% H_2-N_2 and 5% H_2S-N_2 at 450-700 ℃, respectively. The compositions of CSCMn powders were studied by XRD and thermodynamic calculations. Meanwhile, sintering temperatures affecting phases of CSCMn is also proposed with XRD, and the analysis is given with thermodynamic calculations. CSCMn exhibits good chemical compatibility with electrolyte (SDC) in N_2. After exposure to 5% H_2S-N_2 for 5 h at 800 ℃, CSCMn crystal structures change and some sulfides are detected, as evidenced by XRD and Raman analyses. The electrochemical properties are measured for the cell comprising CSCMn- SDC/SDC/Ag in 5% H_2S-N_2 at 600 ℃ and in 3% H_2-N_2 at 450 and 500 ℃. The electrochemical impedance spectrum (EIS) is used to analyze ohm and polarization resistance of the cell at various temperatures.