超小型黄色缺陷型TiO2纳米颗粒，用于无助催化剂的光催化制氢,Nano Energy

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超小型黄色缺陷型TiO2纳米颗粒，用于无助催化剂的光催化制氢
Nano Energy ( IF 16.8 ) Pub Date : 2016-04-06 16:15:19
Qingping Wu, Feng Huang, Mingshi Zhao, Ju Xu, Jiangcong Zhou, Yuansheng Wang

蓝色TiO ₂（Ti ³⁺缺陷TiO ₂）纳米粒子已被广泛研究用于光催化H _2的生产。但是，Ti ^3+的能级在导带以下约1.0eV，不能引发可见光驱动的H ₂生成。因此，Pt或NiO _x通常被用作助催化剂，其在经济上没有吸引力并且对环境具有污染性。在本文中，没有引入任何外部掺杂剂的情况下，首次合成了超小的黄色TiO ₂纳米颗粒（〜3nm）。掺入黄色TiO _2中的钛空位（受体）和钛间隙（供体）通过各种表征技术证明了它们的存在，并提出了它们的形成机理。光催化评估表明，受体-供体缺陷在催化过程中起着关键作用，不仅引发而且促进了可见光驱动的H ₂产生。活性的提高还通过黄色TiO ₂的模拟太阳光驱动的H ₂生成量比正常TiO _2的〜3.7倍来证明。。合理的解释是受体-供体缺陷缔合形成内部极化，用于自发分离光生电荷载流子。通过光致发光光谱和光致发光发射衰减曲线证实了改善的电荷-载流子分离。取代传统的基于TiO ₂的光催化剂，受主-供体缺陷工程化的光催化剂系统提供了一种新的方法，可以同时启动和促进可见光驱动的无H ₂助催化剂的生产。

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Ultra-small yellow defective TiO2 nanoparticles for co-catalyst free photocatalytic hydrogen production

Blue TiO₂ (Ti³⁺defected TiO₂) nanoparticles have been intensively investigated for photocatalytic H₂ production. However, the Ti³⁺, with energy level ~1.0eV below the conduction band, cannot initiate visible light driven H₂ production. Thus, Pt or NiO_x is often used as a co-catalyst, which is economically unattractive and environmentally contaminative. In this paper, the ultra-small yellow TiO₂ nanoparticles (~3nm) have been firstly synthesized without introducing any external dopants. The titanium vacancies (acceptor) and titanium interstitials (donor) that incorporated in the yellow TiO₂ are evidenced by various characterization techniques, and their formation mechanism is proposed. Photocatalytic evaluations indicate that the acceptor-donor defects play key roles in the catalytic process, not only initiating, but also promoting the visible light driven H₂ production. The improved activity is also evidenced by that the simulated solar light driven H₂ production for the yellow TiO₂ is ~3.7 fold comparing to that of the normal TiO₂. A reasonable explanation is that the acceptor-donor defect associates form internal polarization for spontaneously separating photo-generated charge-carriers. The improved charge-carrier separation has been confirmed by photoluminescence spectra and photoluminescence emission decay profiles. Instead of the traditional TiO₂ based photocatalysts, the acceptor-donor defect engineered photocatalyst system offers a new approach for simultaneously initiating and promoting visible light driven co-catalyst free H₂ production.

更新日期：2016-04-07

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