This title appears in the Scientific Report :
2017
Please use the identifier:
http://dx.doi.org/10.1016/j.tsf.2017.06.038 in citations.
Thin film proton conducting membranes for micro-solid oxide fuel cells by chemical solution deposition
Thin film proton conducting membranes for micro-solid oxide fuel cells by chemical solution deposition
Micro solid oxide fuel cells (μ-SOFC) were manufactured with perovskite type proton conductors on silicon substrates and with structured Pt-grid electrodes. In order to miniaturize the μ-SOFCs and to shorten the ion path through the electrolyte, the thin film proton conductors were only ~ 510 nm thi...
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Personal Name(s): | Engels, J. |
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Griesche, D. / Waser, R. / Schneller, T. (Corresponding author) | |
Contributing Institute: |
Elektronische Materialien; PGI-7 Plasmaphysik; IEK-4 JARA-FIT; JARA-FIT |
Published in: | Thin solid films, 636 (2017) S. 446 - 457 |
Imprint: |
Amsterdam [u.a.]
Elsevier
2017
|
DOI: |
10.1016/j.tsf.2017.06.038 |
Document Type: |
Journal Article |
Research Program: |
Helmholtz Interdisciplinary Doctoral Training in Energy and Climate Research (HITEC) Controlling Collective States |
Publikationsportal JuSER |
Micro solid oxide fuel cells (μ-SOFC) were manufactured with perovskite type proton conductors on silicon substrates and with structured Pt-grid electrodes. In order to miniaturize the μ-SOFCs and to shorten the ion path through the electrolyte, the thin film proton conductors were only ~ 510 nm thick. The thin films consist of 10 mol% yttrium-doped BaZrO3 (BZY10) and they were deposited by means of chemical solution deposition (CSD). CSD was applied, because it represents a highly attractive fabrication method, considering the relatively low investment costs and flexibility with regard to stoichiometry. The backsides of the μ-SOFCs on the substrates were opened by wet chemical and plasma etching to form the freestanding membranes. The completed μ-SOFCs resist up to a temperature of 450 °C. Their electrical properties, such as permittivity, and resistivity were investigated. By means of electrochemical impedance spectroscopy (EIS) in the temperature range of 100 °C to 450 °C, the resistivity properties and the activation energies of the model μ-SOFC were studied with humid hydrogen in nitrogen at the anode and different oxygen partial pressures at the cathode. The results provide a clear hint for a dominating protonic defect transport mechanism in the electrolyte. In the 450 °C measurement, the model μ-SOFCs reached an open circuit voltage of 600 mV with 100% oxygen at the cathode and humid hydrogen in nitrogen at the anode. |