Photoelectrocatalytic water splitting represents a sustainable strategy for producing “green hydrogen” through visible-light-driven hydrogen evolution (HER) and oxygen evolution reactions (OER) under applied bias. The advancement of cost-effective photoelectrode materials with high efficiency and durability remains imperative, as single-component semiconductors often suffer from inadequate bandgap alignment, inefficient carrier separation, and insufficient stability. Herein, we fabricate Bi 2 WO 6 /Ti 3 C 2 T x -800 composite photoanodes on recyclable carbon felt (CF) substrates via electrophoretic deposition. By strategically modulating the work function at the Mott-Schottky junction of Bi 2 WO 6 /Ti 3 C 2 T x -800, we precisely tailored the energy band structure of Bi 2 WO 6 , enhancing its carrier separation efficiency and light absorption. The optimized system delivers a photocurrent density of 6.44 mA cm −2 at 1.23 V vs. reversible hydrogen electrode (RHE), alongside an applied bias photon-to-current efficiency (ABPE) of 0.73 % at 1.08 V and a charge-transfer efficiency (η tran ) of 74.68 % at 1.23 V, surpassing most reported Bi 2 WO 6 -based counterparts. This work establishes a robust design paradigm for high-performance photoanodes, advancing scalable solar-driven water-splitting technologies.
A series of cobalt-nitrogen modified catalysts were prepared and applied to the degradation of phenol . The Mott Schottky catalyst (CoO/NGr@C) with high pyridine nitrogen content was designed to activate potassium peroxodisulfate (PDS) to generate active free radicals for phenol degradation. The structural properties of the materials are analyzed by XPS , TEM and then the charge density calculation is performed by DFT, which proves the existence of the highly active interface effect. Co–N-C MCM-41 can only degrade phenol into benzoquinone and it is difficult to achieve further degradation of benzoquinone, while the modified CoO/NGr@C can achieve deep mineralization of the intermediate benzoquinone through UV spectrum. EPR was used to prove that both hydroxyl radicals and sulfate radicals exist in the degradation process of phenol. Through the DFT simulation calculation of the material, it is proved that the existence of carbon activated by nitrogen and the electron rearrangement between cobalt and nitrogen-rich carbon lead to the catalytic activity of the material. The degradation conditions of phenol were optimized and the reaction kinetics of further phenol degradation were studied. The activation energy of phenol degradation on CoO/NGr@C is calculated to be 34.38 kJ mol −1 .
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