Metal-covalent organic frameworks (metal-COFs) for energy storage
Metal- and covalent organic frameworks (MOFs and COFs) are emergent classes of crystalline, highly porous 2D and 3D materials. Whereas MOFs comprise metal centers or clusters bridged by coordinating organic ligands, COFs are built from purely organic materials linked by strong covalent bonds. These can be prepared in different topologies, readily modified post-assembly, and have been exploited for numerous applications ranging from gas storage to catalysis. Redox-active variants of such materials have recently emerged as promising candidates for electrochemical energy storage, though their use has been restricted by the poor stability and low electrical conductivity of the intrinsic framework structure. We are developing strategies to construct and characterize novel families of redox-active metal-COFs, where organometallic complexes are used directly as ‘struts’ and ‘nodes’. This approach takes advantage of the coordinative stability of these metal centers in different oxidation states.