TY  - EJOUR
AU  - Chakraborty, Pritam
AU  - Wolf, Stephanie
AU  - Ummethala, Govind
AU  - Meise, Ansgar
AU  - Mehlkoph, Tobias
AU  - Park, Junbeom
AU  - Heggen, Marc
AU  - Tavabi, Amir H.
AU  - Vibhu, Vaibhav
AU  - de Haart, L. G. J.
AU  - Dunin-Borkowski, Rafal E.
AU  - Basak, Shibabrata
AU  - Eichel, Rüdiger-A.
AU  - Jodat, Eva
AU  - Karl, André
TI  - Unveiling the Exsolution Mechanisms and Investigation of the Catalytic Processes of Sr2FeMo0.65Ni0.35O6-δ  Using in Situ Transmission Electron Microscopy
JO  - NANOTODAY-D-24-01469
PB  - Elsevier
M1  - FZJ-2025-00694
PY  - 2024
AB  - Solid oxide cells (SOCs) are crucial for transitioning to green energy but face high-temperature degradation challenges, in which catalyst agglomeration is one of the major obstacle. Nanoparticle exsolution in double-perovskite materials such as Sr2FeMo0.65Ni0.35O6-δ (SFM-Ni) offer a promising solution by creating electrode materials with uniformly dispersed, stable metallic FeNi3 nanocatalysts strongly bonded to the parent oxide, mitigating high-temperature agglomeration issues. Thus, understanding the dynamic evolution of microstructure and catalytic behavior in such materials is vital for developing high-performing SOC catalysts. In this study, detailed investigation using in situ electron microscopy was conducted to elucidate the mechanisms of FeNi3 nanoparticle exsolution on SFM-Ni under reducing conditions. In situ environmental transmission electron microscopy (ETEM), in situ transmission electron microscopy (TEM) coupled with mass spectrometry were employed to analyze exsolution processes and their impact on catalytic performance, along with other techniques. Electrochemical impedance spectroscopy (EIS) measurements confirmed the enhanced long-term performance of symmetrically fabricated SFM-Ni/GDC/8YSZ/GDC/SFM-Ni cells and further scanning electron microscopy (SEM) investigation of the operated cells validated our findings at macro scale. Additionally, focused ion beam-scanning electron microscopy (FIB-SEM) tomography on the electrochemically operated cells revealed various microstructural changes introduced due to the exsolutions, underscoring the role of exsolution dynamics in SOC performance. This study attempts to unravel the mechanisms behind the formation of the uniformly dispersed FeNi3 nano-exsolutions which significantly boost catalytic efficiency of SFM-Ni electrodes. These insights can guide the preparation of improved electrode materials for SOCs, enhancing electrochemical performance at both the micro and macro levels, advancing the field of sustainable energy technologies.
LB  - PUB:(DE-HGF)25
DO  - DOI:10.2139/ssrn.4928089
UR  - https://juser.fz-juelich.de/record/1037390
ER  -