Excavating hidden adsorption sites in metal-organic frameworks using rational defect engineering.

Area of Science:

• Materials Science
• Chemical Engineering
• Computational Chemistry

Background:

• Metal-organic frameworks (MOFs) possess crystalline structures often containing inherent defects.
• Strategic engineering of these defects can significantly alter material properties and enhance performance.
• Defect engineering offers a promising avenue for optimizing existing MOF materials.

Purpose of the Study:

• To computationally screen a large database of experimental MOFs for improved methane storage capacity.
• To identify MOFs amenable to defect engineering, specifically linker vacancy defects.
• To demonstrate the enhancement of methane storage in MOFs through rational defect modification.

Main Methods:

• High-throughput computational screening of an experimental MOF database.
• Identification of MOFs with methane-inaccessible pores.
• Emulation of linker vacancies using modulators.
• Grand canonical Monte Carlo (GCMC) simulations to assess methane storage capacity.

Main Results:

• Identified 13 candidate MOFs exhibiting potential for enhanced methane storage.
• Demonstrated significant improvements in methane storage capacities in defective MOFs.
• Validated the integration and utilization of previously inaccessible pores through defect engineering.

Conclusions:

• Rational defect engineering, particularly linker vacancies, is an effective strategy to enhance MOF performance.
• Computational screening is a viable approach for identifying MOFs suitable for defect-based optimization.
• Engineered MOFs show significant promise for improved gas storage applications, such as methane storage.