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

doi:10.15541/jim20150467

Abstract

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

CLC Number:

TG146

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.

Figures/Tables 4

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

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

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

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

References 27

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

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