Construction of cobalt-based metal-organic framework derivatives for efficient oxygen evolution reaction

Cobalt-based metal-organic frameworks (Co-MOFs) derivatives have garnered significant attention as advanced electrocatalysts due to their unique structural advantages, including high-density catalytic active centers, atomiclevel site uniformity, tunable porous architectures, and exceptional specific surface areas. Capitalizing on the thermal stability of YMUN 2/4 frameworks, we have engineered YMUN 2-300 and 4-300 through a programmed thermal activation strategy (2 degrees C center dot min(-1) ramp to 300 degrees C under N-2 atmosphere), which strategically enhanced oxygen evolution reaction (OER) performance while preserving structural integrity. The linear scanning voltammetry (LSV), chronopotentiometry (CP), and electrochemical impedance spectroscopy (EIS) have been used to evaluate the OER electrochemical activity of 2-300 and 4-300 in 1.0 M KOH electrolyte. The investigated results reveal that 2-300 and 4-300 have prominent overpotential of 247.0 mV, 186.0 mV (at J = 10 mA center dot cm(-2)), respectively, and keeps great chemical stability until 1000 min. Compared to other MOFs materials, 2-300 and 4300 display similar or superior electrocatalytic performance, attributed to synergistic effects of carbonized conductive networks and stabilized Co active sites.