AgX(Cl, Br)-TiO2复合材料光电化学研究

doi:10.15541/jim20150467

无机材料学报 ›› 2016, Vol. 31 ›› Issue (3): 269-273.DOI: 10.15541/jim20150467 CSTR: 32189.14.10.15541/jim20150467

AgX(Cl, Br)-TiO₂复合材料光电化学研究

张亚萍¹, 张安玉¹, 于濂清¹(), 董开拓¹, 李焰², 郝兰众¹

1.中国石油大学(华东) 理学院, 新能源物理与材料科学重点实验室, 青岛 266580
2.中国石油大学(华东) 机电学院, 青岛 266580

收稿日期:2015-09-28 修回日期:2015-12-08 出版日期:2016-03-20 网络出版日期:2016-02-24
作者简介:
于濂清(1979-), 男, 博士, 副教授. E-mail: iyy2000@163.com
基金资助:
国家自然科学基金(21476262);青岛市科技发展计划(14-2-4-108-jch);中央高校基本科研业务经费(R1510059A, 14CX05038A)

Photoelectrochemical Properties of AgX(Cl, Br)-TiO₂ Heterojunction Nanocomposites

ZHANG Ya-Ping¹, ZHANG An-Yu¹, YU Lian-Qing¹(), DONG Kai-Tuo¹, LI Yan², HAO Lan-Zhong¹

1. College of Science, China University of Petroleum, Qingdao 266580, China
2. College of Mechanics, China University of Petroleum, Qingdao 266580, China

Received:2015-09-28 Revised:2015-12-08 Published:2016-03-20 Online:2016-02-24
Supported by:
National Natural Science Foundation of China (21476262);Technology Project of Qingdao (14-2-4-108-jch);Fundamental Research Funds for the Central Universities (R1510059A, 14CX05038A)

摘要/Abstract

摘要：

以阳极氧化法制备的高度有序TiO₂纳米管阵列作为基底, 用沉积法在TiO₂纳米管上复合AgCl和AgBr纳米颗粒形成AgX-TiO₂异质结。采用XRD、FESEM等分析结果表征, 结果表明: AgCl以厚度为50 nm、长度为1 μm的片状结构堆叠分布, AgBr的沉积过程较温和, 沉积速度相对更慢, 均匀分散在TiO₂纳米管表面; 随着沉积次数增加, 纳米管阵列表面形貌发生改变。光电化学研究表明: 样品经过复合AgBr后, 可以有效提高TiO₂纳米管阵列的光电转化效率, 当AgBr沉积1次时, 其光电转化效率达到2.67%, 而复合的AgCl对于TiO₂纳米管阵列的光电效率改善效果欠佳。

关键词: 阳极氧化法, 二氧化钛纳米管, 卤化银, 光电化学

Abstract:

Sunlight-driven photoelectrochemical water splitting into hydrogen and oxygen presents a great way to develop green solar energy. Titanium dioxide is believed to be one of the most stable photoanode materials. Here, ordered TiO₂ nanotube arrays were prepared by anodic oxidation method. Then AgCl or AgBr were successfully deposited on TiO₂ nanotube arrays by dipping method. The morphology and crystal structures of AgX-TiO₂ heterojunctions were tested by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). The results showed that AgCl was deposited with 50 nm thickness and 1 μm length structure, while AgBr can be evenly dispersed on surface of TiO₂ nanotube arrays. AgX amount increased with extending impregnation recycling time, and formed different surface morphology of nanotube arrays. Electrochemical test indicated that suitable amount of AgBr in the TiO₂nanotube arrays improved the photoelectrochemical properties, an optimum photoconversion efficiency obtained at 2.67%. Excess deposited AgX will lead to incompletely utilizing sunlight due to blocked nanotube arrays, and result in lower photoconversion efficiency.

Key words: anodic oxidation method, nanotube, TiO₂, photoelectrochemical properties

中图分类号:

TG146

张亚萍, 张安玉, 于濂清, 董开拓, 李焰, 郝兰众. AgX(Cl, Br)-TiO₂复合材料光电化学研究[J]. 无机材料学报, 2016, 31(3): 269-273.

ZHANG Ya-Ping, ZHANG An-Yu, YU Lian-Qing, DONG Kai-Tuo, LI Yan, HAO Lan-Zhong. Photoelectrochemical Properties of AgX(Cl, Br)-TiO₂ Heterojunction Nanocomposites[J]. Journal of Inorganic Materials, 2016, 31(3): 269-273.

图/表 4

图1 沉积AgX对TiO2复合材料的影响

Fig. 1 AgX deposited on TiO2 nanotubes(a) XRD patterns (a) and SEM images of (b) pure TiO2, (c) AgBr after 1 cycle (d) AgBr after 3 cycles, (e) AgCl after 1 cycle and (f) AgCl after 5 cycles

图2 AgCl-TiO2异质结复合纳米材料的I-t曲线(a), Mott-schottky曲线(b)和光转化率曲线(c)

Fig. 2 I-t (a), Mott-schottky (b) and photoconversion rate (c) curves of AgCl-TiO2 composites

表1 AgX-TiO2复合纳米材料的的光电性质

Table1 Photoelectric properties of AgX-TiO2 composite

AgX	Cycles	Photovoltage /V	Photocurrent /(mA·cm^-2)	Photoconversion rate/%
Blank	0	-0.440	0.260	0.95
AgCl	1 3 5 7 9	-0.215 -0.296 -0.287 -0.302 -0.274	0.180 0.251 0.231 0.169 0.148	0.51 0.58 0.60 0.58 0.48
AgBr	1 3 5 7 9	-0.186 -0.586 -0.280 -0.222 -0.400	0.258 0.238 0.215 0.268 0.151	2.67 0.46 0.58 0.62 0.29

图3 AgBr-TiO2异质结复合纳米材料I-t曲线(a), Mott-schottky曲线(b), 光转化率曲线(c)和能级结构示意图(d)

Fig. 3 I-t (a), Mott-schottky (b), photoconversion rate (c) and energy level structure (d) curves of AgBr-TiO2 heterojunction composites

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AgX(Cl, Br)-TiO₂复合材料光电化学研究

Photoelectrochemical Properties of AgX(Cl, Br)-TiO₂ Heterojunction Nanocomposites

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