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

doi:10.6023/A16050256

化学学报 ›› 2016, Vol. 74 ›› Issue (10): 825-832.DOI: 10.6023/A16050256 上一篇下一篇

研究论文

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).

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摘要/Abstract

首次通过高效电化学沉积法在FTO导电玻璃上成功合成三元复合材料CeO₂@Ag@CdSe纳米管阵列.在该体系中，银纳米粒子能够在表面等离子体效应下增强光吸收性能，而且能够提供一个内部通道促进光生载流子的转移与分离.CeO₂@Ag@CdSe纳米棒阵列在偏压为-0.2 V（vs.Ag/AgCl）时，能够产生较高的光生电流3.92 mA·cm^-2，该光生电流密度比双组分系统CeO₂@CdSe（0.802 mA·cm^-2）高4.9倍.该三元材料在360 nm单色光下的光电转换效率高达72%，且该光电极在连续测试16 min后仍能保持其光稳定性能.

关键词: 光电化学, 电化学沉积, 异质结, 纳米管阵列, 光稳定性能

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

引用此文

赵秘, 李浩华, 沈小平. 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[J]. 化学学报, 2016, 74(10): 825-832.

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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