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

doi:10.6023/A16050256

Acta Chim. Sinica ›› 2016, Vol. 74 ›› Issue (10): 825-832.DOI: 10.6023/A16050256 Previous Articles Next Articles

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电化学沉积法制备CeO₂@Ag@CdSe纳米管阵列及其光电化学性能研究

赵秘^a, 李浩华^b, 沈小平^a

a 江苏大学化学化工学院镇江 212013;
b 江苏大学材料科学与工程学院镇江 212013

投稿日期:2016-05-24 发布日期:2016-10-20
通讯作者: 沈小平,E-mail:xiaopingshen@163.com;Tel.:0511-88791800;Fax:0511-88791800 E-mail:xiaopingshen@163.com
基金资助:
项目受国家自然科学基金（Nos.51272094，51302111）和教育部博士点基金（No.20123227110018）资助.

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

Zhao Mi^a, Li Haohua^b, Shen Xiaoping^a

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

Received:2016-05-24 Published:2016-10-20
Supported by:
Project supported by the National Natural Science Foundation of China (Nos. 51272094, 51302111) and Specialized Research Fund for the Doctoral Program of Higher Education of China (No. 20123227110018).

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.

Key words: photoelectrochemical, electrodeposition, heterostructure, nanotube arrays, photostability

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

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电化学沉积法制备CeO₂@Ag@CdSe纳米管阵列及其光电化学性能研究

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

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电化学沉积法制备CeO2@Ag@CdSe纳米管阵列及其光电化学性能研究