Photocatalytic methane oxidation over a TiO₂/SiNWs p-n junction catalyst at room temperature.

IF 2.6 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Beilstein Journal of Nanotechnology Pub Date : 2024-09-02 eCollection Date: 2024-01-01 DOI:10.3762/bjnano.15.92

Qui Thanh Hoai Ta, Luan Minh Nguyen, Ngoc Hoi Nguyen, Phan Khanh Thinh Nguyen, Dai Hai Nguyen

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引用次数: 0

Abstract

Rapid recombination of charge carriers in semiconductors is a main drawback for photocatalytic oxidative coupling of methane (OCM) reactions. Herein, we propose a novel catalyst by developing a p-n junction titania-silicon nanowires (TiO₂/SiNWs) heterostructure. The structure is fabricated by atomic layer deposition of TiO₂ on p-type SiNWs. The TiO₂/SiNWs heterostructure exhibited an outstanding OCM performance under simulated solar light irradiation compared to the single components. This enhanced efficiency was attributed to the intrinsic electrical field formed between n-type TiO₂ and p-type SiNWs, which forces generated charge carriers to move in opposite directions and suppresses charge recombination. Besides, surface morphology and optical properties of the the p-n TiO₂/SiNWs catalyst are also beneficial for the photocatalytic activity. It is expected that the results of this study will provide massive guidance in synthesizing an efficient photocatalyst for CH₄ conversion under mild conditions.

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室温下 TiO2/SiNWs p-n 结催化剂的光催化甲烷氧化作用。

半导体中电荷载流子的快速重组是光催化甲烷氧化偶联（OCM）反应的主要缺点。在此，我们通过开发一种 p-n 结二氧化钛-硅纳米线（TiO2/SiNWs）异质结构，提出了一种新型催化剂。该结构是通过在 p 型硅纳米线上原子层沉积 TiO2 制成的。与单一成分相比，TiO2/SiNWs 异质结构在模拟太阳光照射下表现出卓越的 OCM 性能。效率的提高归功于 n 型 TiO2 和 p 型 SiNWs 之间形成的固有电场，该电场迫使产生的电荷载流子向相反的方向移动，从而抑制了电荷重组。此外，p-n TiO2/SiNWs 催化剂的表面形貌和光学特性也有利于提高光催化活性。预计本研究的结果将为在温和条件下合成一种用于转化 CH4 的高效光催化剂提供大量指导。

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

Beilstein Journal of Nanotechnology NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

5.70

自引率

3.20%

发文量

109

审稿时长

2 months

期刊介绍： The Beilstein Journal of Nanotechnology is an international, peer-reviewed, Open Access journal. It provides a unique platform for rapid publication without any charges (free for author and reader) – Platinum Open Access. The content is freely accessible 365 days a year to any user worldwide. Articles are available online immediately upon publication and are publicly archived in all major repositories. In addition, it provides a platform for publishing thematic issues (theme-based collections of articles) on topical issues in nanoscience and nanotechnology. The journal is published and completely funded by the Beilstein-Institut, a non-profit foundation located in Frankfurt am Main, Germany. The editor-in-chief is Professor Thomas Schimmel – Karlsruhe Institute of Technology. He is supported by more than 20 associate editors who are responsible for a particular subject area within the scope of the journal.