Citation: Zhao Mi, Li Haohua, Shen Xiaoping. Facile Electrochemical Synthesis of CeO₂@Ag@CdSe Nanotube Arrays with Enhanced Photoelectrochemical Performance[J]. Acta Chimica Sinica, ;2016, 74(10): 825-832. doi: 10.6023/A16050256 shu

Facile Electrochemical Synthesis of CeO₂@Ag@CdSe Nanotube Arrays with Enhanced Photoelectrochemical Performance

1.
a School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China;
2.
b School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China

Corresponding author: Shen Xiaoping,
Received Date: 24 May 2016

Fund Project:

In this work, for the first time, three-component CeO₂@Ag@CdSe heterostructured nanotube arrays with remarkable photoelectrochemical (PEC) properties have been synthesized on the FTO conductive glass substrate by an electrodeposition method. One-dimensional vertically ordered CeO₂ nanotube arrays were prepared on the FTO substrate by electrodeposition method with Ce(NO₃)₂·6H₂O and C₂H₆SO as the raw materials. Ag nanoparticles were deposited on the surface of CeO₂ nanotube arrays through a successive electrodeposition in a solution of AgNO₃, and a composite system of CeO₂@Ag was obtained. Then a thin CdSe layer was deposited and covered on the CeO₂@Ag system to form three-component CeO₂@Ag@CdSe heterostructured nanotube arrays. The as-synthesized products were characterized using X-ray diffraction (XRD), X-ray energy dispersive spectroscopy (EDS), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), ultraviolet-visible (UV-Vis) spectroscopy, Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and photoluminescence (PL) spectroscopy. The PEC properties of the obtained products were recorded with electrochemical workstation, and the results showed that the CdSe layer could greatly enhance light harvesting and significantly improve charge separation. Moreover, the modification with Ag nanoparticles can significantly strengthen the light-harvesting ability through the localized surface plasma resonance effect and provide an interior direct pathway to facilitate the separation and transport of photogenerated carriers. It has been demonstrated that the enhanced PEC properties of CeO₂@Ag@CdSe heterostructures are direct consequence of the synergetic effects of enhanced visible light absorption and the effective separation and transportation of photogenerated carriers at interface of type-II heterostructure via the Ag nanoparticles. Therefore, the CeO₂@Ag@CdSe heterostructured nanotubes generate a remarkable photocurrent density of 3.92 mA·cm^-2 at a potential of -0.2 V (vs. Ag/AgCl), which is 4.9 and 17.9 times higher than that of two-component CeO₂@CdSe (0.802 mA·cm^-2) and CeO₂@Ag (0.218 mA·cm^-2) systems, respectively. It also gives an incident photon to current conversion efficiency (IPCE) as high as 72% at around 360 nm. Moreover, the photoelectrode shows high photostability during the test period over 16 min.
- photoelectrochemical,
- electrodeposition,
- heterostructure,
- nanotube arrays,
- photostability
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1.
沈阳化工大学材料科学与工程学院沈阳 110142

Facile Electrochemical Synthesis of CeO2@Ag@CdSe Nanotube Arrays with Enhanced Photoelectrochemical Performance

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通讯作者: 陈斌, bchen63@163.com

Facile Electrochemical Synthesis of CeO₂@Ag@CdSe Nanotube Arrays with Enhanced Photoelectrochemical Performance