Rational strategies for proton-conductive metal-organic frameworks

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Proton-conducting materials are vital for electrochemical devices and energy platforms.
• Solid-state proton conductors (SSPCs) offer high performance and safety for fuel cells (FCs).
• Proton-conductive porous metal-organic frameworks (MOFs) show promise as solid-state electrolytes with high conductivity (>10-2 S cm-1).

Purpose of the Study:

• To review rational design strategies for highly proton-conductive MOFs.
• To highlight the role of MOF components (metal centers, linkers, pore space) in proton conduction.
• To discuss current challenges and future research directions in the field.

Main Methods:

• Review of recent literature on proton-conductive MOFs.
• Analysis of design strategies based on MOF structural components.
• Identification of key factors influencing proton conductivity in MOFs.

Main Results:

• MOFs offer structural designability, crystallinity, and porosity beneficial for proton conduction.
• Judicious predesign or post-synthetic modification of MOF components enhances mobile proton concentration and conduction pathways.
• Representative examples of highly proton-conductive MOFs are presented.

Conclusions:

• Rational design of MOF components is key to achieving high proton conductivity.
• Proton-conductive MOFs are promising for advanced solid-state electrolyte applications.
• Further research is needed to overcome challenges and optimize MOF design for fuel cells.