Revealing Progressive Degradation of Cobalt Oxide Nanoparticles During Thermochemical Redox Cycling via Operando STEM-EELS
Madeline Van Winkle, Stephen D. House, Yuxiang Peng, Yu-chen Karen Chen-Wiegart, Katherine Jungjohann, John S. Mangum
TL;DR
Researchers used advanced imaging to study how cobalt oxide nanoparticles degrade during energy storage cycles, finding that their performance drops after the first cycle due to structural changes.
Contribution
A novel method using operando STEM-EELS is introduced to observe cobalt oxide nanoparticle degradation during thermochemical cycling at high resolution.
Findings
Reaction kinetics of cobalt oxide nanoparticles decrease after the first cycle due to sintering and nanostructural densification.
Atmospheric conditions affect reaction transition temperatures but have limited impact on sintering over multiple cycles.
Long-term durability of cobalt oxide nanoparticles depends on synthetic or nanostructural modifications rather than environmental factors.
Abstract
Metal oxides are promising materials for long-duration thermochemical energy storage. Efforts to characterize their reaction kinetics, conversion rate, and morphological evolution during thermochemical cycling have largely focused on bulk and microscale measurements. However, the design of nanostructured metal oxides could improve the reaction reversibility and kinetics, warranting the development of platforms to investigate how these materials behave at the nanoscale. Here, we demonstrate the use of correlative, time-resolved electron energy loss spectroscopy and imaging in an environmental transmission electron microscope for studying the thermochemical cyclability of cobalt oxide nanoparticles with high spatial and temporal resolution. The spectroscopic data reveal a striking decrease in reaction kinetics after the first cycle, resulting from sintering-driven nanostructural…
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Taxonomy
TopicsChemical Looping and Thermochemical Processes · Adsorption and Cooling Systems · Thermal Expansion and Ionic Conductivity