Berlin 2024 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 35: Topical Session: Hydrogen in Materials: from Storage to Embrittlement VI
MM 35.2: Vortrag
Mittwoch, 20. März 2024, 12:15–12:30, C 130
In-situ TEM reduction of a solid oxide cell with NiO/YSZ and NiO/BZCY materials for fuel electrode — •Svetlana Korneychuk1,2, Cedric Grosselindemann1, Norbert H Menzler3, André Weber1, and Astrid Pundt1 — 1Karlsruhe Institute of Technology, Karlsruhe, Germany — 2KNMFi, Karlsruhe Institute of Technology, Karlsruhe, Germany — 3Forschungszentrum Jülich GmbH, Jülich, Germany
Solid oxide fuel cells play a key role in the transition to the green economy. The quality of the electrode plays a major role in the performance and durability of a fuel cell. Ni/YSZ or Ni/BZCY fuel cell electrodes of solid oxide cells are commonly reduced from NiO/YSZ or NiO/BZCY under hydrogen atmosphere at high temperatures, prior to operation. The reduction results in a significant change in microstructure. As specific microstructural properties are crucial to achieve high performance and durability of the cell, a comprehensive understanding of the reduction process is required. Using in-situ TEM atmosphere system from Protochips we studied the electrode reduction at the H2 pressures up to 1 atmosphere and temperatures up to 850 °C [1] which fit the real working condition of a solid oxide cell. Grain boundaries and triple junctions between NiO and YSZ or BZCY are determined as the starting points of the reduction process at lower temperatures. The initial temperature of the reduction is crucial to achieve a high number of electrochemically active triple phase boundaries between Ni/YSZ and gas. [1] Korneychuk, S. et al., Rochester, NY October 17, 2023. https://doi.org/10.2139/ssrn.4604921
Keywords: solid oxide cell; NiO reduction in hydrogen; in-situ TEM