Boosting Charge Mediation in Ferroelectric BaTiO _{3− <i>x</i>} ‐Based Photoanode for Efficient and Stable Photoelectrochemical Water Oxidation

Oxygen evolution reaction (OER) is a bottleneck to photoelectrochemical (PEC) water splitting; however, there remains an impressive challenge for intrinsic charge transport the development of integrated photoanodes. Herein, covalent triazine frameworks as conjugated molecules are grafted on surfaces ferroelectric BaTiO3−x (CTF/BTO) nanorod array, and then oxyhydroxide oxygen cocatalyst (OEC) constructed photoanode. The OEC/CTF/BTO array not only achieves high photocurrent density 0.83 mA cm−2 at 1.23 V versus reversible hydrogen electrode (vs RHE) low onset potential ≈0.23 VRHE, but also optimizes outstanding stability. To disclose origin, enhanced PEC activity can be contributed integration CTF OEC, enhancing light-harvesting capability, boosting carrier mediation, promoting oxidation kinetics through electrochemical analysis functional theory calculations. This study provides alternative accelerate transfer, paves rational design fabrication photoanodes splitting performance.