In:
ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2015-01, No. 9 ( 2015-04-29), p. 902-902
Abstract:
Since TiO 2 was discovered for water-splitting to generate hydrogen under UV light, plenty of techniques have been explored to obtain suitable sensitizers for visible-light adsorption in order to increase the activity of water-splitting reaction for hydrogen generation [1-3]. Among them, dispersing a 2D graphene andsimilar layered material on TiO 2 nanoparticle exhibits highly photocatalytic activities (i.e. MoS 2 ) [2]. In this paper, graphene-liked WS 2 was chosen due to its activity as HER (hydrogen evolution reaction) catalyst and relatively abundant storage [4]. The expected composite was formed through high energy ball milling technique which makes WS 2 disperse on the surface of TiO 2 nanoparticles [5]. The composites consist of 99.5% TiO 2 and 0.5% WS 2 and were prepared by high energy ball milling for five different periods of time-2hours, 4hours, 8hours, 16hours and 32hours. To identify phase evolution of the as-prepared nanocomposites during high energy ball milling procedure, X-ray diffraction (XRD) was performed to examine phase transition, which is shown in Fig.1. It can be seen that, with increasing milling time, the crystallization decrease at first and increase after further milling. To further study the photoelectrochemical (PEC) characterization of composites after ball milling, a three-electrode setup was used, which is shown in inset of Fig. 2. This three-electrode device consists of a reference electrode (Ag/AgCl), a Pt wire counter electrode, a quartz container filled of 0.5M Na 2 SO 4 aqueous solution and a working electrode. Sintered composites on indium-tin-oxide (ITO) glass substrate acts as the working electrode. Fig.2 shows the PEC measurement results of pure TiO 2 and milled composites with milling time for 2hours, 8hours and 32hours. As can be seen, composite reaches the best photocurrent response with 8 hours milling. It is obvious that compared to pure TiO 2 sample, adding of WS 2 and high energy ball milling make positive effect to composites. In summary, the structure of TiO 2 and WS 2 nanocomposites through high energy ball milling has been studied by X-ray diffraction. Photoelectrochemical properties of the TiO 2 coated with few layered WS 2 shows the optimization photochemical response for 8 hours milled nanocomposites. This work provides a facile and low cost process for large amount production of few layer doped TiO 2 nanocomposites. References [1] A. Fujishima, K. Honda, Nature, 238 (1972) 37. [2] Q. Liu, Z. Pu, A. M. Asiri, A. H. Qusti, A. Q. Al-Youbi, X. Sun,. J Nanopart Res 15 (2013) 1. [3] W. Zhou, Z. Yin, Y. Du, X. Huang, Z. Zeng, Z. Fan, & H. Zhang, Small , 9 (2013) 140. [4] D. Merki, X. Hu, Energ Environ Sci, 4 (2011) 3878. [5] H. C. Nazareno, Y. Zhao, K. Wang, IEEE Nano (2014) Figure 1
Type of Medium:
Online Resource
ISSN:
2151-2043
DOI:
10.1149/MA2015-01/9/902
Language:
Unknown
Publisher:
The Electrochemical Society
Publication Date:
2015
detail.hit.zdb_id:
2438749-6
Permalink
