Exploiting the Bragg Mirror Effect of TiO₂ Nanotube Photonic Crystals for Promoting Photoelectrochemical Water Splitting.

IF 4.4 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Nanomaterials Pub Date : 2024-10-23 DOI:10.3390/nano14211695

Ming Meng, Hucheng Zhou, Jing Yang, Liwei Wang, Honglei Yuan, Yanling Hao, Zhixing Gan

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Abstract

Exploiting the Bragg mirror effect of photonic crystal photoelectrode is desperately desired for photoelectrochemical water splitting. Herein, a novel TiO₂ nanotube photonic crystal bi-layer structure consisting of a top nanotube layer and a bottom nanotube photonic crystal layer is presented. In this architecture, the photonic bandgap of bottom TiO₂ nanotube photonic crystals can be precisely adjusted by modulating the anodization parameters. When the photonic bandgap of bottom TiO₂ nanotube photonic crystals overlaps with the electronic bandgap of TiO₂, the bottom TiO₂ nanotube photonic crystal layer will act as a Bragg mirror, leading to the boosted ultraviolet light absorption of the top TiO₂ nanotube layer. Benefiting from the promoted UV light absorption, the TiO₂ NT-115-NTPC yields a photocurrent density of 1.4 mA/cm² at 0.22 V vs. Ag/AgCl with a Faradic efficiency of 100%, nearly two times higher than that of conventional TiO₂ nanotube arrays. Furthermore, incident photon-to-current conversion efficiency is also promoted within ultraviolet light region. This research offers an effective strategy for improving the performance of photoelectrochemical water splitting through intensifying the light-matter interaction.

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利用二氧化钛纳米管光子晶体的布拉格镜效应促进光电化学水分离。

利用光子晶体光电电极的布拉格镜效应进行光电化学水分离是人们的迫切愿望。本文提出了一种新型 TiO2 纳米管光子晶体双层结构，该结构由顶部纳米管层和底部纳米管光子晶体层组成。在这种结构中，底部 TiO2 纳米管光子晶体的光子带隙可以通过调节阳极化参数来精确调整。当底部 TiO2 纳米管光子晶体的光子带隙与 TiO2 的电子带隙重叠时，底部 TiO2 纳米管光子晶体层将起到布拉格镜的作用，从而促进顶部 TiO2 纳米管层对紫外线的吸收。得益于对紫外线的吸收，TiO2 NT-115-NTPC 在 0.22 V 电压下与 Ag/AgCl 相比可产生 1.4 mA/cm2 的光电流密度，法拉第效率达到 100%，比传统的 TiO2 纳米管阵列高出近两倍。此外，入射光子到电流的转换效率在紫外光区也有所提高。这项研究为通过加强光物质相互作用来提高光电化学分水性能提供了一种有效的策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nanomaterials NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

8.50

自引率

9.40%

发文量

3841

审稿时长

14.22 days

期刊介绍： Nanomaterials (ISSN 2076-4991) is an international and interdisciplinary scholarly open access journal. It publishes reviews, regular research papers, communications, and short notes that are relevant to any field of study that involves nanomaterials, with respect to their science and application. Thus, theoretical and experimental articles will be accepted, along with articles that deal with the synthesis and use of nanomaterials. Articles that synthesize information from multiple fields, and which place discoveries within a broader context, will be preferred. There is no restriction on the length of the papers. Our aim is to encourage scientists to publish their experimental and theoretical research in as much detail as possible. Full experimental or methodical details, or both, must be provided for research articles. Computed data or files regarding the full details of the experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material. Nanomaterials is dedicated to a high scientific standard. All manuscripts undergo a rigorous reviewing process and decisions are based on the recommendations of independent reviewers.