| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Temperature Electrochemistry: An FMD Symposium Honoring Uday B. Pal
|
| Presentation Title |
Quantitatively Relating Reaction Site Density and Performance in Electrocatalyst-infiltrated Ni-YSZ Symmetric Cells |
| Author(s) |
Jillian R. Mulligan, Srikanth Gopalan, Uday Pal, Soumendra Basu |
| On-Site Speaker (Planned) |
Jillian R. Mulligan |
| Abstract Scope |
The performance of Ni-YSZ anodes for solid oxide fuel cell (SOFC) applications has been shown to improve with the infiltration of nanoscale electrocatalysts. Infiltration of mixed ionic and electronic-conducting (MIEC) materials, such as gadolinium-doped ceria (GDC), increases the electrode reaction site density by adding double phase boundaries (DPBs) where reactions can take place. In this research, microstructure techniques, including scanning electron microscopy (SEM) and three-dimensional (3D) reconstruction, are combined with electrochemical methods, including electrochemical impedance spectroscopy (EIS) and distribution of relaxation times (DRT) analysis, to understand the relationship between reaction site density and electrode performance. GDC infiltration improved electrode performance significantly in a symmetric cell, decreasing its polarization resistance by more than a factor of eight and lowering the resistance associated with the active site reactions by a factor of more than twenty-one. The relationship between active site density and performance is also discussed for the uninfiltrated electrode case. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Temperature Materials, Energy Conversion and Storage, |