Abstract
A 500nm thick thin film YSZ (yttria-stabilized zirconia) electrolyte was successfully fabricated on a conventionally processed anode substrate by spin coating of chemical solution containing slow-sintering YSZ nanoparticles with the particle size of 20nm and subsequent sintering at 1100°C. Incorporation of YSZ nanoparticles was effective for suppressing the differential densification of ultrafine precursor powder by mitigating the prevailing bi-axial constraining stress of the rigid substrate with numerous local multi-axial stress fields around them. In particular, adding 5vol% YSZ nanoparticles resulted in a dense and uniform thin film electrolyte with narrow grain size distribution, and fine residual pores in isolated state. The thin film YSZ electrolyte placed on a rigid anode substrate with the GDC (gadolinia-doped ceria) and LSC (La 0.6Sr 0.4CoO 3-δ) layers deposited by PLD (pulsed laser deposition) processes revealed that it had fairly good gas tightness relevant to a SOFC (solid oxide fuel cell) electrolyte and maintained its structural integrity during fabrication and operation processes. In fact, the open circuit voltage was 1.07V and maximum power density was 425mW/cm 2 at 600°C, which demonstrates that the chemical solution route can be a viable means for reducing electrolyte thickness for low- to intermediate-temperature SOFCs.
Original language | English |
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Pages (from-to) | 1733-1741 |
Number of pages | 9 |
Journal | Journal of the European Ceramic Society |
Volume | 32 |
Issue number | 8 |
DOIs | |
Publication status | Published - 2012 Jul |
Keywords
- Constrain sintering
- Fuel cells
- Microstructure
- Sol-gel processes
- Y O -ZrO
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry