Design of five two-dimensional Co-metal-organic frameworks for oxygen evolution reaction and dye degradation...

Two-dimensional (2D) metal-organic frameworks (MOFs) have been extensively investigated as oxygen evolution reaction (OER) materials because of their numerous advantages such as large specific surface areas, ultrathin thicknesses, well-defined active metal centers, and adjustable pore structures. Five Co-metal-organic frameworks, namely, [Co(L) (4.4'-bbidpe)H₂O]_n [YMUN 1 (YMUN for Youjiang Medical University for Nationalities)], {[Co₂(L)₂ (4.4'-bbibp)₂]·[Co³(L) (4.4'-bbibp)]·DMAC}_n (YMUN 2), [Co(L) (3,5-bip)]_n (YMUN 3), [Co(L) (1,4-bimb)]_n (YMUN 4), and [Co(L) (4.4'-bidpe)H₂O]_n (YMUN 5), were designed and fabricated from flexible dicarboxylic acid 1,3-bis(4'-carboxylphenoxy)benzene (H₂L) and rigid/flexible imidazole ligands. Their frameworks consist of two-dimensional lamellar networks with a number of differences in their details. Their frameworks are discussed and compared, and their oxygen evolution reaction electrochemical activities and photocatalysis dye degradation properties are investigated.