TY - GEN
T1 - Recent progress in anode materials for soud oxide fuel cells
AU - Li, Q.
AU - Thangadurai, V.
PY - 2010
Y1 - 2010
N2 - In this paper, we report our recent progress in the development of anode materials for intermediate temperature solid oxide fuel cells (IT-SOFCs). Mo-doped Ce1-xMoxO2+δ (x = 0.05, 0.07, 0.1, 0.13) (CMO), Mo + RE-co-doped Ce0.9-xRExMo 0.1O2.1-0.5x (x = 0.2, 0.3) (RE = Y, Sm, Gd) (CRMO) and Nd2WO6-type Sm2-xAxM 1-yByO6-δ (A = Ca, Sr; M = Mo, W; B = Ce, Ni) have been investigated in our laboratory. For CMO and CRMO, the formation of fluorite-like structure was confirmed by powder X-ray diffraction (PXRD) and the change in the lattice constant was found to be consistent with the Shannon ionic radius trend. CRMO samples treated under dry H2 at elevated temperatures were found to retain the original fluorite structure while CMO showed presence of Mo in the PXRD. Sm2-xAxMoO 6-δ (A = Ca, Sr) after heating under 97% H2 +3% H2O up to 850 °C changed from Nd2WO6-type structure into Sm2MoO5 due to the reduction of Mo VI that was confirmed by PXRD. For CRMO and SMO, the electrical conductivity was determined using 2-probe AC and DC methods and 4-probe DC method in wet H2. The total electrical conductivity obtained from these two different techniques was found to be very close within the experimental error over the investigated temperature range. Among the CRMO samples studied, Ce0.7Sm0.2Mo0.1O2 exhibits the highest total conductivity of 7.8 × 10-2 Scm -1 at 450°C in wet H2 which is comparable to that of perovskite-type La0.75Sr0.25Cr0.5Mn 0.5O3-δ. Nd2WO6-type Sm 1.9Ca0.1MoO6-δ exhibits appreciable conductivity of 8.2 × 10-2 Scm-1 at 550°C in wet H2 with activation energy of 0.08 eV and it appears to be chemically stable against the reaction with YSZ electrolyte at 800 °C for 24 h in 97% H2 +3% H2O.
AB - In this paper, we report our recent progress in the development of anode materials for intermediate temperature solid oxide fuel cells (IT-SOFCs). Mo-doped Ce1-xMoxO2+δ (x = 0.05, 0.07, 0.1, 0.13) (CMO), Mo + RE-co-doped Ce0.9-xRExMo 0.1O2.1-0.5x (x = 0.2, 0.3) (RE = Y, Sm, Gd) (CRMO) and Nd2WO6-type Sm2-xAxM 1-yByO6-δ (A = Ca, Sr; M = Mo, W; B = Ce, Ni) have been investigated in our laboratory. For CMO and CRMO, the formation of fluorite-like structure was confirmed by powder X-ray diffraction (PXRD) and the change in the lattice constant was found to be consistent with the Shannon ionic radius trend. CRMO samples treated under dry H2 at elevated temperatures were found to retain the original fluorite structure while CMO showed presence of Mo in the PXRD. Sm2-xAxMoO 6-δ (A = Ca, Sr) after heating under 97% H2 +3% H2O up to 850 °C changed from Nd2WO6-type structure into Sm2MoO5 due to the reduction of Mo VI that was confirmed by PXRD. For CRMO and SMO, the electrical conductivity was determined using 2-probe AC and DC methods and 4-probe DC method in wet H2. The total electrical conductivity obtained from these two different techniques was found to be very close within the experimental error over the investigated temperature range. Among the CRMO samples studied, Ce0.7Sm0.2Mo0.1O2 exhibits the highest total conductivity of 7.8 × 10-2 Scm -1 at 450°C in wet H2 which is comparable to that of perovskite-type La0.75Sr0.25Cr0.5Mn 0.5O3-δ. Nd2WO6-type Sm 1.9Ca0.1MoO6-δ exhibits appreciable conductivity of 8.2 × 10-2 Scm-1 at 550°C in wet H2 with activation energy of 0.08 eV and it appears to be chemically stable against the reaction with YSZ electrolyte at 800 °C for 24 h in 97% H2 +3% H2O.
UR - https://www.scopus.com/pages/publications/79959522589
U2 - 10.1149/1.3502352
DO - 10.1149/1.3502352
M3 - Conference contribution
AN - SCOPUS:79959522589
SN - 9781607681991
T3 - ECS Transactions
SP - 213
EP - 220
BT - Electrode Processes Relevant to Fuel Cell Technology
PB - Electrochemical Society, Inc.
ER -