Abstract
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.
| Original language | English |
|---|---|
| Title of host publication | ECS Transactions - Solid Oxide Fuel Cells 11 (SOFC-XI) |
| Pages | 2039-2048 |
| Number of pages | 10 |
| Edition | 2 PART 3 |
| DOIs | |
| Publication status | Published - Dec 1 2009 |
| Event | 11th International Symposium on Solid Oxide Fuel Cells (SOFC-XI)- 216th ECS Meeting - Vienna, Austria Duration: Oct 4 2009 → Oct 9 2009 |
Publication series
| Name | ECS Transactions |
|---|---|
| Number | 2 PART 3 |
| Volume | 25 |
| ISSN (Print) | 1938-5862 |
| ISSN (Electronic) | 1938-6737 |
Other
| Other | 11th International Symposium on Solid Oxide Fuel Cells (SOFC-XI)- 216th ECS Meeting |
|---|---|
| Country | Austria |
| City | Vienna |
| Period | 10/4/09 → 10/9/09 |
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All Science Journal Classification (ASJC) codes
- Engineering(all)
Cite this
Performance and long-term durability of nanostructured Ni anodes doped with transition metals prepared by spray mist dryer. / Araki, K.; Yamamoto, J.; Shiratori, Yusuke; Ito, Kohei; Sasaki, Kazunari.
ECS Transactions - Solid Oxide Fuel Cells 11 (SOFC-XI). 2 PART 3. ed. 2009. p. 2039-2048 (ECS Transactions; Vol. 25, No. 2 PART 3).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
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, Yusuke
AU - Ito, Kohei
AU - Sasaki, Kazunari
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.
UR - http://www.scopus.com/inward/record.url?scp=77649105226&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77649105226&partnerID=8YFLogxK
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)
ER -