Acceptor-doped ceria deposited on a porous Ni film as a possible micro-SOFC electrolyte
- 364 Downloads
Micro-SOFCs, miniaturized solid oxide fuel cells (SOFCs) for low temperature operation, are being developed as a power source for portable electronics. Reducing the thickness of the electrolyte and the adoption of acceptor-doped ceria as an electrolyte material are important to minimize the Ohmic resistance at low temperature. Acceptor-doped ceria thin-films are often deposited on nano-porous metal substrates to reduce cracking of the thin electrolyte. However, due to the difficulty of depositing a pore-free electrolyte on a porous medium, the cells often show the low open circuit voltages (OCVs). In this study, we have deposited ∼1 μm-thick Gd-doped ceria on a nano-porous nickel film to assess whether a thin-film, metal-supported GDC can be deposited as a pore-free layer and would thus be suitable as an electrolyte of micro-SOFCs. The Ni-supported GDC cell showed an OCV of ∼0.92 V at 450 °C under a hydrogen/air gradient. The high OCV verifies that the thin-electrolyte layer, deposited on porous Ni using the pulsed laser deposition (PLD) method, is dense enough to prevent gas leakage as also observed in its microstructure.
KeywordsMicro-solid oxide fuel cell Acceptor-doped ceria Open circuit voltage Thin film
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2011-0023389).
- 6.C.-W. Kwon, J.-I. Lee, K.-B. Kim, H.-W. Lee, J.-H. Lee, J.-W. Son, J. Power Sources 210(178) (2012)Google Scholar
- 9.K. Kerman, B.-K. Lai, S. Ramanathan, J. Power Sources 196(2608) (2011)Google Scholar
- 19.C. Wagner, W. Schottky, Z. Phys. Chem. B 11, 25 (1930)Google Scholar