Oxygen Evolution Performance of Bio-based MOFs Derived Co9S8/N, O-C Electrocatalysts

It is crucial to develop efficent oxygen evolution reaction (OER)catalysts for improving the performance of water-splitting devices. Metal-organic frameworks (MOFs)-derived metal-carbon (M-C)materials are widely used as OER catalysts due to their high specific surface area, easy adjustment of composition and structure. In this work, cobalt-gallic acid MOFs (Co-gallate)were assembled from gallic acid as the organic linkers. Via ligands exchange of thiocyanuric acid (TTCA), Co-gallate@TTCA was prepared. After carbonization of Co-gallate@TTCA, Co9 S8/N, O-C electrocatalyst was obtained and the OER catalytic performance was evaluated. Compared with Co/O-C prepared by direct carbonization of Co-gallate, the overpotential of Co9 S8/N, O-C material was only 270 mV with a Tafel slope of 71. 5 mV·dec-1 at a current density of 10 mA·cm-2, and the OER performance was significantly improved. Moreover, the synthesized Co9 S8/N, O-C material exhibits long-term catalytic stability. In this work, a readily available bio-based MOF was used as a sacrificial template, and N and S-containing ligands were introduced into the MOFs structure through ligand exchange. By changing the composition and structure of the carbonized products, the catalytic activity and kinetic performance of the catalysts are effectively improved. © 2024 Cailiao Daobaoshe/ Materials Review. All rights reserved.