Two‐Dimensional Coordination Polymers as Efficient Photoanodes Toward Solar‐Driven Water Oxidation

Amid growing global energy demands and environmental concerns, hydrogen energy has emerged as a promising clean alternative. This study focuses on the development of efficient photoelectrocatalytic materials for the oxygen evolution reaction (OER). Three novel two‐dimensional coordination polymers— SNUT‐9‐Cd , SNUT‐9‐Cd+Co , and SNUT‐9‐Co —were solvothermally synthesized using a tricarboxylic pyridazine‐based ligand, H 3 (5‐CMOIA). Thermogravimetric analysis (TGA) confirmed their high thermal stability, with SNUT‐9‐Co maintaining structural integrity up to 300°C. Mott–Schottky analysis confirmed the n‐type semiconductor behavior of all three compounds. SNUT‐9‐Co stood out with its superior OER performance under simulated solar irradiation, displaying a low overpotential of 261 mV at 0.3 mA·cm −2 , rapid charge transfer, and excellent stability, thereby highlighting its promise as a photoanode for solar‐driven water splitting.