Ag-TiO2 nanotube arrays prepared by electrochemical deposition with high photocatalytic hydrogen evolution efficiency

IF 2.1 4区材料科学 Q3 CHEMISTRY, MULTIDISCIPLINARY

Journal of Nanoparticle Research Pub Date : 2024-09-04 DOI:10.1007/s11051-024-06118-9

Rui Piao, Man Dai, Xueqin Wang, Peng Qiao, Hejin Liu, Xianshu Zheng, Yanxiu Liu, Hua Song

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Abstract

A series of Ag-TiO₂ nanotube catalysts were prepared by electrochemical deposition. Doping of Ag nanoparticles was regulated by adjusting the deposition voltage, which altered the photocatalytic performance of the sample. The electrochemical properties of the Ag-TiO₂ nanotubes were characterized using X-ray photoelectron spectroscopy, scanning electron microscopy (SEM), photoluminescence (PL) spectroscopy, and ultraviolet–visible (UV–vis) diffuse reflection spectroscopy. PL and UV–vis spectroscopy showed that the Ag-TiO₂ nanotubes had a higher visible-light absorption activity and a lower photogenerated electron–hole pair recombination rate. SEM analysis showed that the highly ordered tubular structure of the TiO₂ nanotubes was not disrupted after electrochemical deposition, and the size and quantity of the Ag nanoparticles deposited on the TiO₂ nanotubes increased with increasing deposition voltage. The Ag-TiO₂ nanotubes prepared at a deposition voltage of 1 V exhibited the highest hydrogen evolution efficiency, with a theoretical hydrogen production rate of 12.59 µmol∙cm⁻²∙h⁻¹ under UV irradiation. This was 2.1-fold higher than that of pure TiO₂ nanotubes and was attributable to the local surface plasmon resonance effect of Ag nanoparticles, which enhanced the visible light absorption by the TiO₂ nanotubes.

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通过电化学沉积制备具有高光催化氢气进化效率的 Ag-TiO2 纳米管阵列

通过电化学沉积法制备了一系列 Ag-TiO2 纳米管催化剂。通过调节沉积电压来调节银纳米粒子的掺杂量，从而改变样品的光催化性能。利用 X 射线光电子能谱、扫描电子显微镜（SEM）、光致发光（PL）光谱和紫外-可见（UV-vis）漫反射光谱对 Ag-TiO2 纳米管的电化学性能进行了表征。光致发光和紫外-可见光谱显示，Ag-TiO2 纳米管具有更高的可见光吸收活性和更低的光生电子-空穴对重组率。扫描电镜分析表明，电化学沉积后，TiO2 纳米管高度有序的管状结构没有被破坏，沉积在 TiO2 纳米管上的 Ag 纳米颗粒的尺寸和数量随着沉积电压的增加而增加。沉积电压为 1 V 时制备的 Ag-TiO2 纳米管的氢进化效率最高，在紫外线照射下的理论产氢率为 12.59 µmol∙cm-2∙h-1。这比纯 TiO2 纳米管高出 2.1 倍，原因是 Ag 纳米粒子的局部表面等离子体共振效应增强了 TiO2 纳米管对可见光的吸收。

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来源期刊

Journal of Nanoparticle Research 工程技术-材料科学：综合

CiteScore

4.40

自引率

4.00%

发文量

198

审稿时长

3.9 months

期刊介绍： The objective of the Journal of Nanoparticle Research is to disseminate knowledge of the physical, chemical and biological phenomena and processes in structures that have at least one lengthscale ranging from molecular to approximately 100 nm (or submicron in some situations), and exhibit improved and novel properties that are a direct result of their small size. Nanoparticle research is a key component of nanoscience, nanoengineering and nanotechnology. The focus of the Journal is on the specific concepts, properties, phenomena, and processes related to particles, tubes, layers, macromolecules, clusters and other finite structures of the nanoscale size range. Synthesis, assembly, transport, reactivity, and stability of such structures are considered. Development of in-situ and ex-situ instrumentation for characterization of nanoparticles and their interfaces should be based on new principles for probing properties and phenomena not well understood at the nanometer scale. Modeling and simulation may include atom-based quantum mechanics; molecular dynamics; single-particle, multi-body and continuum based models; fractals; other methods suitable for modeling particle synthesis, assembling and interaction processes. Realization and application of systems, structures and devices with novel functions obtained via precursor nanoparticles is emphasized. Approaches may include gas-, liquid-, solid-, and vacuum-based processes, size reduction, chemical- and bio-self assembly. Contributions include utilization of nanoparticle systems for enhancing a phenomenon or process and particle assembling into hierarchical structures, as well as formulation and the administration of drugs. Synergistic approaches originating from different disciplines and technologies, and interaction between the research providers and users in this field, are encouraged.