Covalent Organic Frameworks Composites Containing Bipyridine Metal Complex for Oxygen Evolution and Methane Conversion.

ABSTRACT: Novel covalent organic framework (COF) composites containing a bipyridine multimetal complex were designed and obtained via the coordination interaction between bipyridine groups and metal ions. The obtained Pt and polyoxometalate (POM)-loaded COF complex (POM-Pt@COF-TB) exhibited excellent oxidation of methane. In addition, the resultant Co/Fe-based COF composites achieved great performance in an electrocatalytic oxygen evolution reaction (OER). Compared with Co-modified COFs (Co@COF-TB), the optimized bimetallic modified COF composites (Co_0.75Fe_0.25@COF-TB) exhibited great performance for electrocatalytic OER activity, showing a lower overpotential of 331 mV at 10 mA cm^-2. Meanwhile, Co_0.75Fe_0.25@COF-TB also possessed a great turnover frequency (TOF) value (0.119 s^-1) at the overpotential of 330 mV, which exhibited high efficiency in the utilization of metal atoms and was better than that of many reported COF-based OER electrocatalysts. This work provides a new perspective for the future coordination of COFs with bimetallic or polymetallic ions, and broadens the application of COFs in methane conversion and electrocatalytic oxygen evolution.

SUBMITTER: Liu X 

PROVIDER: S-EPMC9416349 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature