TiN/TiO2复合光电极的构建及TiN的等离激元光热作用

doi:10.15541/jim20250483

摘要/Abstract

摘要： TiN纳米颗粒具有显著的等离激元光热特性,但其与TiO₂光电极的光热性能还有待研究。本研究以尿素为氮源,采用溶胶-凝胶法可控制备了TiN纳米颗粒,调控TiN分散液的旋涂用量制备了一系列TiN/TiO₂复合光电极。研究表明,控制尿素/四氯化钛摩尔比为8可制得10~30 nm的TiN颗粒。采用该颗粒的200 μL 2%(质量分数)乙醇分散液,通过旋涂法制备的TiN/TiO₂复合光电极,在模拟太阳光照射下光电流密度达到1.47 mA·cm^-2、开路光电压达到0.69 V,较纯TiO₂光电极分别提升75%和57%,并可稳定输出3 h以上。引入TiN增强了材料在可见光区吸收,在光照下TiN纳米颗粒快速升温,热量有效传递至TiO₂基底,促进界面电荷转移与表面反应动力学,说明TiN的光热效应可提升光电极表面局域温度以增强光电极水分解性能。

关键词: TiN纳米材料, 溶胶凝胶法, TiN/TiO₂复合光电极, 光电化学, 等离激元光热作用

Abstract: 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 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 wt% 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.

Key words: TiN nanomaterials, Sol-Gel method, TiN/TiO₂ composite photoanode, photoelectrochemistry, plasmonic photothermal effect

中图分类号:

TQ116

李扬扬, 桑丽霞, 陈梦佳, 杜春旭. TiN/TiO₂复合光电极的构建及TiN的等离激元光热作用[J]. 无机材料学报, DOI: 10.15541/jim20250483.

LI Yangyang, SANG Lixia, CHEN Mengjia, DU Chunxu. Construction of TiN/TiO₂ Composite Photoanodes and Plasmonic Photothermal Role of TiN[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20250483.

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TiN/TiO₂复合光电极的构建及TiN的等离激元光热作用

Construction of TiN/TiO₂ Composite Photoanodes and Plasmonic Photothermal Role of TiN

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