Photogenerated charges transfer across the interface between NiO and TiO2 nanotube arrays for photocatalytic degradation: A surface photovoltage study
Photogenerated charges transfer across the interface between NiO and TiO2 nanotube arrays for photocatalytic degradation: A surface photovoltage study
复制标题
光生电荷在 NiO 和 TiO2 纳米管阵列之间的界面上转移以实现光催化降解：表面光电压研究
DOI：
10.1016/j.jcis.2015.11.019
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发表时间：
2016-02-15
影响因子：
9.9
通讯作者：
Xie, Tengfeng
中科院分区：
文献类型：
--
作者：
Hou, Libo;Li, Shuo;Xie, Tengfeng
深入了解复合光催化剂界面中光生电荷的行为，有助于设计高效的光催化反应用光催化剂。利用表面光伏(SPV)谱和瞬时光伏(TPV)研究了NiO/TiO2纳米管阵列(NiO/TiO2NTAs)中光生电荷的分离和转移过程。通过对实验结果的分析，我们发现在NiO/TiO2NTAs界面上形成了界面电场，这归因于NiO和TiO2NTAs之间功函数的差异。在紫外光照射下，二氧化钛中的光生空穴可以沿着界面电场向NiO层转移。大量光生空穴可以被有效分离，从而延长空穴寿命，参与光催化氧化反应。以上结果表明，NiO在TiO2NTAS表面良好的空穴收集过程是提高光催化效率的主要因素。(C)2015 Elsevier Inc.保留所有权利。
To better understand the behavior of photogenerated charges in the composite photocatalyst interface is beneficial to the designing of effective photocatalyst for photocatalytic reaction. In our work, the separation and transfer process of photogenerated charges in NiO/TiO2 nanotube arrays (NiO/TiO2 NTAs) has been studied by surface photovoltage (SPV) spectroscopy and transient photovoltage (TPV) measurement. Through the experimental results analysis, we find that an interfacial electric field is formed at NiO/TiO2 NTAs interface, which is attributed to the work function difference between NiO and TiO2 NTAs. The photogenerated holes in TiO2 can transfer to the NiO layer along the interface electric field under the ultraviolet irradiation. A large amount of photogenerated holes can be separated effectively and then prolonged the holes lifetime to participate in the photocatalytic oxidation reaction. The above results show that the favorable hole-collecting process of NiO in the surface of TiO2 NTAs is the main factor being responsible for the increase the photocatalytic efficiency. (C) 2015 Elsevier Inc. All rights reserved.