Proton Transport in Metal-Organic Frameworks.

Solid-state proton conductors (SSPCs), which are a key component for the safety and efficiency of fuel cells, have received much attention due to their broad application in electrochemical devices. In particular, the development of new materials with high conducting performance and an understanding of the conduction mechanism have become critical issues in this field. Porous metal-organic frameworks (MOFs) or porous coordination polymers (PCPs) have recently emerged and have been extensively studied as a new type of proton conductor due to their crystallinity, designability, and high porosity. These properties are able to adsorb the guest molecules working as conducting media. During the past decade, major advances in proton-conductive MOFs have been achieved with high performance (>10