TiN/TiO2复合光电极的构建及TiN的等离激元光热作用OA

TiN nanoparticles exhibit significant plasmonic photothermal properties,yet their role within TiN/TiO2 composite photoanodes remains unclear.In this work,TiN nanoparticles were controllably synthesized via a Sol-Gel method using urea as the nitrogen source.A series of TiN/TiO2 composite photoanodes were fabricated by adjusting the spin-coating volume of the TiN dispersion.The results show that TiN nanoparticles with size in the range of 10-30 nm can be obtained by controlling the urea/TiCl4 molar ratio to 8.The TiN/TiO2 composite photoelectrode,fabricated by spin-coating 200 μL of 2%(in mass)ethanol dispersion of these nanoparticles,achieves a photocurrent density of 1.47 mA·cm-2 and an open-circuit photovoltage of 0.69 V under simulated solar illumination,enhanced by 75%and 57%,respectively,compared to pristine TiO2 photoelectrode,and the electrode maintains stable performance for over 3 h.Introduction of TiN enhances visible light absorption of material.Therefore,under illumination,TiN nanoparticles undergo rapid heating,and the generated heat is efficiently transferred to the TiO2 substrate,promoting interfacial charge transfer and surface reaction kinetics.These findings demonstrate that the photothermal effect of TiN can elevate the local temperature at the photoelectrode surface,thereby enhancing photoelectrochemical water splitting performance.