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Probing Structural Transformations and Degradation Mechanisms by Direct Observation in SIFSIX-3-Ni for Direct Air

Michael L Barsoum¹, Jan Hofmann², Haomiao Xie³

¹Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States.

Journal of the American Chemical Society

|January 25, 2024

Summary

Researchers studied SIFSIX-3-Ni metal-organic frameworks (MOFs) for direct air capture of carbon dioxide (CO2). They found water degrades MOF performance by causing irreversible structural changes, hindering CO2 capture.

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Area of Science:

Materials Science
Environmental Science
Chemistry

Background:

Industrialization increases carbon dioxide (CO2) emissions, driving climate change.
Direct air capture (DAC) technologies are crucial for mitigating greenhouse gas levels.
Metal-organic frameworks (MOFs) like SIFSIX-3-Ni show promise for CO2 capture but face stability challenges.

Purpose of the Study:

Investigate the degradation mechanisms of SIFSIX-3-Ni under conditions simulating DAC regeneration.
Elucidate the role of water in the performance decline of SIFSIX-3-Ni during CO2 adsorption and desorption cycles.
Identify structural changes and their impact on CO2 uptake capacity.

Main Methods:

Growth of large SIFSIX-3-Ni single crystals for detailed analysis.
Single crystal X-ray diffraction to observe molecular dynamics.
In situ X-ray scattering and pair distribution function analysis to study structural transformations.
Accelerated aging experiments mimicking column regeneration conditions.

Main Results:

Identified a novel space group (I4/mcm) for SIFSIX-3-Ni, revealing structural transitions.
Observed water's detrimental role in degrading CO2 adsorption capacity.
Documented irreversible decomposition into nonporous nickel oxide nanosheets upon aging.
Characterized CO2 adsorption and temperature-dependent desorption mechanisms within the framework.

Conclusions:

Water-induced irreversible decomposition limits the long-term stability and CO2 sorption efficiency of SIFSIX-3-Ni.
Understanding these degradation pathways is vital for designing robust DAC sorbents.
Findings offer strategies to enhance MOF stability for practical direct air capture applications.