MgTiO₃/MgTi₂O₅/TiO₂ heterogeneous belt-junctions with high photocatalytic hydrogen production activity

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• 作者：Ling Meng ; Zhiyu Ren ; Wei Zhou ; Yang Qu ; Guofeng Wang
• 关键词：MgTiO3/MgTi2O5/TiO2 ; heterogeneous belt ; junctions ; photocatalytic hydrogen production
• 刊名：Nano Research
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：10
• 期：1
• 页码：295-304
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Nanotechnology; Materials Science, general; Atomic/Molecular Structure and Spectra; Condensed Matter Physics; Biotechnology; Biomedicine, general;
• 出版者：Tsinghua University Press
• ISSN：1998-0000
• 卷排序：10

文摘

An effective photocatalytic hydrogen production catalyst comprising MgTiO₃/MgTi₂O₅/TiO₂ heterogeneous belt-junctions was prepared using magnesium ions by a thermally driven doping method. The tri-phase heterogeneous junction was confirmed by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), and high-resolution TEM (HRTEM). The as-prepared MgTiO₃/MgTi₂O₅/TiO₂ heterojunctions exhibited a very high photocatalytic hydrogen production activity (356.1 mol·g_0.1gcat·h-1) and an apparent quantum efficiency (50.69% at 365 nm) that is about twice of that of bare TiO2 nanobelts (189.4 mol·g_0.1gcat·h-1). Linear sweep voltage and transient photocurrent characterization as well as analysis of the electrochemical impedance spectra and Mott–Schottky plots revealed that the high photocatalytic performance is caused by the one-dimensional structure, which imparts excellent charge transportation characteristic, and the MgTiO₃/MgTi₂O₅/TiO₂ tri-phase heterojunction, which effectively drives the charge separation through the inherent electric field. This titanate-based tri-phase heterogeneous junction photocatalyst further enriches the catalyst system for photocatalytic hydrogen production.