Structural defects in MOfs for efficient direct CO2 capture
We developed a new approach for the design of advanced adsorbents for CO2 capture, based on the controlled introduction of structural defects into metal-organic frameworks (MOFs). By partially removing metal centers from an ordered framework, we demonstrated that the resulting vacancies can significantly enhance CO2 capture from diluted sources, such as air.
At the center of the study way NICS-24, a material developed at the National Institute of Chemistry, which we used as a model system for the precise introductions of defects that can be deliberately exploited to improve CO2 adsorption. The partial deficiency of metal centers lead to improved CO2 diffusion through the porous srtucture while also weakening the interaction with adsorption sites. This enables faster uptake and more efficient release of CO2, which is crucial for practical applications in direct air capture processes.
The study combines detailed insight into structural changes at the atomic level with their impact on the macroscopic performance of the material. The results open new opportunities for the development of advanced CO2 capture materials, in which structural defects are not regarded as imperfections, but rather as an important tool for improving adsorption efficiency.
Link to article: https://pubs.acs.org/doi/10.1021/jacs.6c04820
Contact: matjaz.mazaj(at)ki.si