A. Faes, Q. Jeangros
Environmental transmission electron microscopy was utilized to characterize in situ the reduction and oxidation processes of nickel from a Ni/YSZ solid oxide fuel cell anode support within the temperature range of 300-500°C under low hydrogen pressure. The findings indicate that reduction initiates at the NiO/YSZ interface and progresses to the center of the NiO grain, with higher temperatures permitting reduction at the free NiO surface and NiO grain boundaries. The growth of nickel was observed to occur epitaxially on its oxide, accompanied by the formation of nanopores due to a significant volume decrease during the reduction phase. Conversely, upon oxidation, nickel oxide nanocrystallites formed on the nickel surface, filling in the associated porosity and resulting in an inhomogeneous structure with residual voids. This structural change produces expansion within the nickel oxide during a RedOx cycle, highlighting the implications of these processes on the electrochemical performance and structural integrity of solid oxide fuel cells.
@article{dc7c4ca2-fa70-4696-86a3-efda1764d81d,
title={In situ Reduction and Oxidation of Nickel from Solid Oxide Fuel Cells in a Transmission Electron Microscope},
author={A. Faes and Q. Jeangros},
year={2009},
language={en}
}TY - JOUR TI - In situ Reduction and Oxidation of Nickel from Solid Oxide Fuel Cells in a Transmission Electron Microscope AU - A. Faes AU - Q. Jeangros PY - 2009 LA - en ER -
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