TY - GEN
T1 - Performance and long-term durability of nanostructured Ni anodes doped with transition metals prepared by spray mist dryer
AU - Araki, K.
AU - Yamamoto, J.
AU - Shiratori, Y.
AU - Ito, K.
AU - Sasaki, K.
PY - 2009/12/1
Y1 - 2009/12/1
N2 - Various additives for Ni anodes mixed with scandium stabilized zirconia (ScSZ) prepared by spray mist dryer are examined for SOFCs in order to improve their anodic activity and long-term durability. Among the additives examined, it is found that the addition of Mn was highly effective to improve anode activity and sulfur tolerance. In case 5 mol% Mn was added to Ni, at 800°C and 200 mA/cm2 for 50% pre-reformed CH4 fuels (S/C = 2.5), the anodic overvoltage was as low as 18 mV and the initial cell voltage drop by 5 ppm H2S was ca. 30 m V, which was less than half of the initial cell voltage drop for undoped Ni-cermet anodes. Mn-oxide reacts with NiO during preparation, while Ni metal nanoparticles will be segregated after reduction and Mn-oxide acts as pinning sites to depress grain growth and agglomeration of Ni particles, leading to lower anodic overvoltage and higher sulfur tolerance. Long-term durability up to 3000 hours has been verified.
AB - Various additives for Ni anodes mixed with scandium stabilized zirconia (ScSZ) prepared by spray mist dryer are examined for SOFCs in order to improve their anodic activity and long-term durability. Among the additives examined, it is found that the addition of Mn was highly effective to improve anode activity and sulfur tolerance. In case 5 mol% Mn was added to Ni, at 800°C and 200 mA/cm2 for 50% pre-reformed CH4 fuels (S/C = 2.5), the anodic overvoltage was as low as 18 mV and the initial cell voltage drop by 5 ppm H2S was ca. 30 m V, which was less than half of the initial cell voltage drop for undoped Ni-cermet anodes. Mn-oxide reacts with NiO during preparation, while Ni metal nanoparticles will be segregated after reduction and Mn-oxide acts as pinning sites to depress grain growth and agglomeration of Ni particles, leading to lower anodic overvoltage and higher sulfur tolerance. Long-term durability up to 3000 hours has been verified.
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U2 - 10.1149/1.3205749
DO - 10.1149/1.3205749
M3 - Conference contribution
AN - SCOPUS:77649105226
SN - 9781566777391
T3 - ECS Transactions
SP - 2039
EP - 2048
BT - ECS Transactions - Solid Oxide Fuel Cells 11 (SOFC-XI)
T2 - 11th International Symposium on Solid Oxide Fuel Cells (SOFC-XI)- 216th ECS Meeting
Y2 - 4 October 2009 through 9 October 2009
ER -