Fabrication of Ag/Ag3PO4/TiO2 heterostructure photoelectrodes for efficient decomposition of 2-chlorophenol under visible light irradiation
Fabrication of Ag/Ag3PO4/TiO2 heterostructure photoelectrodes for efficient decomposition of 2-chlorophenol under visible light irradiation
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可见光照射下有效分解2-氯苯酚的Ag/Ag3PO4/TiO2异质结光电极的制备
DOI：
10.1039/c3ta11254c
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发表时间：
2013-07
影响因子：
11.9
通讯作者：
Guohua Chen
中科院分区：
文献类型：
--
作者：
Wei Teng;Xinyong Li;Qidong Zhao;Guohua Chen
通过连续化学浴沉积的方法在纳米管阵列表面修饰了Ag/Ag3PO4纳米粒子，然后在紫外光照射下将Ag3PO4纳米粒子中的Ag+离子部分还原为Ag0。用扫描电子显微镜(SEM)、高分辨电子显微镜(HRTEM)、X射线衍射仪(XRD)、X射线光电子能谱(XPS)、紫外-可见漫反射光谱(UV-Vis)、光致发光(PL)光谱和电化学技术对Ag/Ag3PO4/TiO2纳米管电极的结构和光学性能进行了表征。以2-氯苯酚在可见光(λ>；420 nm)下的分解反应来评价复合电极的光电催化活性。在二氧化钛纳米管(NTS)表面成功地形成了Ag/Ag3PO4纳米粒子簇，对纳米管的有序结构没有造成破坏。Ag/Ag3PO4/TiO2NTS的荧光强度远低于TiO2NTS。沉积在TiO2NTS上的p型Ag3PO4和Ag纳米粒子能够促进光生电子的转移，从而有效地抑制电子和空穴的复合，导致光电流密度显著增加。此外，在可见光照射下，Ag/Ag3PO4/TiO2光电极对2-CP水溶液的PEC活性明显高于纯TiO2NTS。PEC活性的提高可以归因于Ag3PO4的可见光催化活性以及Ag3PO4与TiO2光催化剂之间的异质结构。电子自旋共振(ESR)的自旋陷阱研究进一步证明，在可见光照射下，Ag/Ag3PO4/TiO2NTS上可以产生·OH。
TiO2 nanotube arrays were decorated with Ag/Ag3PO4 nanoparticles through a sequential chemical bath deposition and followed by partial reduction of Ag+ ions in the Ag3PO4 nanoparticles to Ag0 under UV irradiation. The structure and optical properties of the Ag/Ag3PO4/TiO2 nanotube electrode were characterized by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse reflectance spectroscopy, photoluminescence (PL) spectroscopy and electrochemical techniques. The photoelectrocatalytic (PEC) activity of the composite electrode was evaluated by the decomposition of 2-chlorophenol under visible light irradiation (λ > 420 nm). Clusters of Ag/Ag3PO4 nanoparticles were successfully formed on the surface of the TiO2 nanotubes (NTs) causing no damage to the ordered structure of the nanotubes. The PL intensity of Ag/Ag3PO4/TiO2 NTs was much lower than that of TiO2 nanotubes. The p-type Ag3PO4 and Ag nanoparticles deposited on the TiO2 NTs could promote the transfer of photo-generated electrons, which inhibited the recombination of electrons and holes effectively, leading to a significant increase in the photocurrent density. Moreover, the Ag/Ag3PO4/TiO2 heterostructure photoelectrodes showed much higher PEC activity than the pure TiO2 NTs for the degradation of 2-CP aqueous solution under visible light irradiation. The enhanced PEC activity could be attributed to the visible-light photocatalytic activity of Ag3PO4 and the heterostructure between Ag3PO4 and TiO2. The electron spin resonance (ESR) spin-trap study further demonstrated that ˙OH could be generated on the Ag/Ag3PO4/TiO2 NTs under visible light irradiation.
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