Carbon coating stabilized Ti3+-doped TiO2 for photocatalytic hydrogen generation under visible light irradiation
Carbon coating stabilized Ti3+-doped TiO2 for photocatalytic hydrogen generation under visible light irradiation
复制标题
碳涂层稳定的 Ti3 掺杂 TiO2 用于可见光照射下光催化制氢
DOI：
10.1039/c5dt01204j
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发表时间：
2015-01-01
影响因子：
4
通讯作者：
Zou, Zhigang
中科院分区：
文献类型：
--
作者：
Fu, Gao;Zhou, Peng;Zou, Zhigang
Ti 3+自掺杂是将TiO 2光响应扩展到可见光区的有效方法。然而，由于Ti 3+在非均相反应期间容易氧化，因此获得稳定的Ti 3+掺杂的TiO 2似乎是一个挑战。在这里，我们提出了一个简单的碳涂层路线，以稳定的Ti 3+掺杂的二氧化钛，其中的Ti 3+和碳涂层的前体原位形成从异丙醇钛的水热水解。碳包覆Ti 3+掺杂的TiO 2具有优异的光催化产氢稳定性。基于电子顺磁共振（EPR）分析，提出稳定机理是导电碳涂层作为阻挡层阻止了H2O和O-2扩散到光催化剂表面，氧化了表面O空位和TiO 2中的Ti 3+。我们的研究结果提供了一个简单的路线，以制备一个高度稳定的二氧化钛基光催化剂与可见光响应。
Self-doping by Ti3+ is a useful method to expand the light response of TiO2 into the visible light region. However, to obtain a stable Ti3+-doped TiO2 seems to be a challenge due to the easy oxidation of Ti3+ during the heterogeneous reaction. Here, we propose a simple carbon coating route to stabilize the Ti3+-doped TiO2, in which both the Ti3+ and precursor of the carbon coating layer were in situ formed from the hydrothermal hydrolysis of titanium isopropoxide. The carbon coated Ti3+-doped TiO2 exhibited excellent stability for photocatalytic hydrogen production. Based on electron paramagnetic resonance (EPR) analysis, the proposed stabilizing mechanism is that the conductive carbon coating layer as a barrier layer prevents the H2O and O-2 from diffusing into the surface of the photocatalyst, which can oxidize the surface O vacancies and Ti3+ in TiO2. Our findings offer a simple route to prepare a highly stable TiO2-based photocatalyst with visible light response.