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Quantifying Percolated Triple Phase Boundary Density and Its Effects on Anodic Polarization in Ni-Infiltrated Ni/YSZ SOFC Anodes
- Source :
- Journal of The Electrochemical Society. 168:114507
- Publication Year :
- 2021
- Publisher :
- The Electrochemical Society, 2021.
-
Abstract
- Increasing the density of percolated triple phase boundaries (TPBs) by infiltrating nanoscale electrocatalysts can improve the performance of solid oxide fuel cell (SOFC) anodes. However, the complex microstructure of these infiltrated nanocatalysts creates challenges in quantifying their role in anode performance improvements. In this research, scanning electron microscopy of fractured cross-sections of a Ni-nanocatalyst infiltrated anodic symmetric cell along with three-dimensional (3-D) reconstruction of the same anode have been used to quantify the changes in percolated TPB densities due to infiltration. This change in percolated TPB density has been compared to the improvement in anode activation polarization resistance measured by electrochemical impedance spectroscopy (EIS). It was found that increased TPB densities only partially accounted for the measured performance improvement. Distribution of relaxation times (DRT) analyses showed that a reduction in the time constants of the catalytic processes in the anode also play a role, suggesting that the added nanoscale percolated TPB boundaries are more electrochemically active as compared to the cermet TPB boundaries.
- Subjects :
- Materials science
Renewable Energy, Sustainability and the Environment
Materials Chemistry
Electrochemistry
Composite material
Condensed Matter Physics
Polarization (electrochemistry)
Triple phase boundary
Yttria-stabilized zirconia
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Anode
Subjects
Details
- ISSN :
- 19457111 and 00134651
- Volume :
- 168
- Database :
- OpenAIRE
- Journal :
- Journal of The Electrochemical Society
- Accession number :
- edsair.doi...........47e7e81b0653e041567cade4b678cd0f
- Full Text :
- https://doi.org/10.1149/1945-7111/ac3599