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Femtosecond Laser-Induced Surface Modification of the Electrolyte in Solid Oxide Electrolysis Cells

1
Institute of Thermodynamics, Leibniz University Hannover, Welfengarten 1, 30167 Hannover, Germany
2
Research Center Energy Storage Technologies, Clausthal University of Technology, Am Stollen 19A, 38640 Goslar, Germany
3
Fraunhofer Heinrich Hertz Institute, Am Stollen 19H, 38640 Goslar, Germany
*
Author to whom correspondence should be addressed.
Energies 2020, 13(24), 6562; https://doi.org/10.3390/en13246562
Received: 4 November 2020 / Revised: 27 November 2020 / Accepted: 9 December 2020 / Published: 12 December 2020
(This article belongs to the Section Hydrogen Energy)
Electrolyte-supported solid oxide cells are often used for steam electrolysis. Advantages are high mechanical stability and a low degradation rate. The aim of this proof of concept study was to use a femtosecond laser to process the electrolyte of an electrolyte-supported solid oxide cell and evaluate the effect of this laser treatment on the electrochemical performance. The femtosecond laser treatment induces a macroscopic and a superimposed microscopic structure. It can be proven that the electrolyte remains gas tight and the electrochemical performance increases independently of the laser parameters. The initial area-specific resistance degradation during a constant current measurement of 200 h was reduced from 7.9% for a non-treated reference cell to 3.2% for one of the laser-treated cells. Based on electrochemical impedance measurements, it was found that the high frequency resistance of the laser-treated cells was reduced by up to 20% with respect to the reference cell. The impedance spectra were evaluated by calculating the distribution of relaxation times, and in advance, a novel approach was used to approximate the gas concentration resistance, which was related to the test setup and not to the cell. It was found that the low frequency polarization resistance was increased for the laser-treated cells. In total, the area-specific resistance of the laser-treated cells was reduced by up to 14%. View Full-Text
Keywords: solid oxide electrolysis cell; electrochemical impedance spectroscopy; distribution of relaxation time; femtosecond laser solid oxide electrolysis cell; electrochemical impedance spectroscopy; distribution of relaxation time; femtosecond laser
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MDPI and ACS Style

Marquardt, T.; Hollmann, J.; Gimpel, T.; Schade, W.; Kabelac, S. Femtosecond Laser-Induced Surface Modification of the Electrolyte in Solid Oxide Electrolysis Cells. Energies 2020, 13, 6562. https://doi.org/10.3390/en13246562

AMA Style

Marquardt T, Hollmann J, Gimpel T, Schade W, Kabelac S. Femtosecond Laser-Induced Surface Modification of the Electrolyte in Solid Oxide Electrolysis Cells. Energies. 2020; 13(24):6562. https://doi.org/10.3390/en13246562

Chicago/Turabian Style

Marquardt, Tobias, Jan Hollmann, Thomas Gimpel, Wolfgang Schade, and Stephan Kabelac. 2020. "Femtosecond Laser-Induced Surface Modification of the Electrolyte in Solid Oxide Electrolysis Cells" Energies 13, no. 24: 6562. https://doi.org/10.3390/en13246562

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