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| Home > Publications database > Assembly of 8YSZ nanoparticles into gas-tight 1-2 µm thick 8YSZ electrolyte layers using wet coating methods |
| Home > Publications database > Assembly of 8YSZ nanoparticles into gas-tight 1-2 µm thick 8YSZ electrolyte layers using wet coating methods |
| Journal Article | PreJuSER-19211 |
; ; ;
2012
Elsevier Science
Amsterdam [u.a.]
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Please use a persistent id in citations: doi:10.1016/j.jeurceramsoc.2011.07.012
Abstract: The application of a thin film electrolyte layer with a thickness in the micrometer range could greatly improve current solid oxide fuel cells (SOFCs) in terms of operating temperature and power output. Since the achievable minimal layer thickness with conventional powder coating methods is limited to similar to 5 mu m, a variety of thin film methods have been studied, but results on regular large-scale anode substrates are still lacking in the literature. In this paper, a wet coating process is presented for fabricating gas-tight 1-2 mu m thick 8YSZ electrolyte layers on a regular NiO/8YSZ substrate, with a rough surface, a high porosity and a large pore size. These layers were deposited in a similar way as conventional suspension based layers, but the essential difference includes the use of coating liquids (nano-dispersion, sol) with a considerably smaller particle size (85 nm, 60 nm, 35 nm, 6 nm). Successful deposition of such layers was accomplished by means of an innovative coating process, which involves the preparation of a hybrid polyvinyl alcohol/8YSZ membrane by dip-coating or spin-coating and subsequently burning out the polymer part at 500 degrees C. Results from He leak tests confirmed that the sintered layers posses a very low number of defects and with values in the range 10(-4)-10(-6) (hPa dm(3))/(s cm(2)) the gas-tightness of the thin film layers is satisfactory for fuel cell operation. Moreover, preliminary results have also indicated a potential reduction of the sintering temperature from 1400 degrees C to the range 1200-1300 degrees C, using the presented coating process. (C) 2011 Elsevier Ltd. All rights reserved.
Keyword(s): J ; Fuel cells (auto) ; Films (auto) ; ZrO2 (auto) ; Sol-gel processes (auto) ; Thin 8YSZ electrolyte (auto)
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