Constructing MIL-53(Fe)@ZIF-67(Co) binary metal–organic framework hierarchical heterostructure electrodes for efficient oxygen evolution

Abstract

Improving the efficiency of anodic oxygen evolution (OER) is important to solve the global energy crisis and greenhouse problems. In this paper, a preparation method of MIL-53(Fe)@ZIF-67(Co) composite electrode is...

Interfacial Co–O–Fe bonding in novel amorphous NiCo-ZIF@MIL-100 as efficient active sites enabling electrocatalytic water oxidation

“…4c of the O 1s XPS spectrum, it could be shown that the dominant peaks of NiCo-ZIF@MIL (1 : 2) originate from the O-H (532.3 eV), C-C]O (531.16 eV), and O-M (530.48 eV). 23,27 Additionally, this interaction between NiCo-ZIF and MIL-100 affects the coordination environment of O, which leads to obvious shis of binding energies (compared with ESI Fig. S3c †).…”

“…23 Compared to single MOF materials, dual-MOF materials tend to exhibit higher catalytic activity, due to the fact that the multiphase structure of the double-MOF composites exposes more active sites, and the synergistic interaction between the composites enhances the charge transfer ability, optimizes the conversion of oxygen-containing intermediates, and reduces the free energy, thus improving the catalytic performance of the materials. [24][25][26][27] In general, MIL-100 is synthesized with benzene-1,3,5-tricarboxylic acid as a ligand. Since the hydroxyl group could construct defects and modify the active sites to promote the adsorption of OH − and oxygen-containing intermediates, which improves the OER activity, 28 we chose a hydroxyl dimer as the ligand to prepare Fe-MIL-100.…”

Tuning the d-band states of NiFe-MOFs by combining early and late transition metals for enhanced electrocatalytic oxygen evolution

“…Metal–organic frameworks (MOFs) are highly ordered porous coordination polymers with 2D or 3D structures formed from metal cluster nodes (secondary building units, SBUs) and polydentate organic ligands, 1–4 which are widely used in CO 2 separation, 5,6 sensing, 7 photocatalysis, 8 environmental detection, 9,10 energy conversion 11,12 and other applications. 13 It is worth noting that MOFs are highly versatile platforms to construct highly efficient oxygen evolution reaction (OER) electrocatalysts benefiting from abundant metal sources and organic ligands, large specific surface area, adjustable porosity and tunable functionality.…”