Surface Properties of Anatase TiO2 Nanowire Films Grown from a Fluoride-Containing Solution

被引:3
作者
Berger, Thomas [1 ]
Anta, Juan A. [1 ]
Morales-Florez, Victor [2 ,3 ]
机构
[1] Univ Pablo Olavide, Dept Sistemas Fis Quim & Nat, Area Quim Fis, Seville 41013, Spain
[2] CSIC Univ Sevilla, Inst Ciencia Mat Sevilla, Seville 41092, Spain
[3] Univ Seville, Dept Fis Mat Condensada, E-41012 Seville, Spain
关键词
anatase titania; electronic properties; nanowire films; spectroelectrochemistry; water photooxidation; TITANIUM-DIOXIDE ELECTRODES; SENSITIZED SOLAR-CELL; THIN-FILMS; AQUEOUS-SOLUTION; DIRECT DEPOSITION; IR ABSORPTIONS; 001; FACETS; NANOPARTICLES; PERFORMANCE; RUTILE;
D O I
10.1002/cphc.201300024
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Controlling the surface chemistry of nucleating seeds during wet-chemical synthesis allows for the preparation of morphologically well-defined nanostructures. Synthesis conditions play a key role in the surface properties, which directly affect the functional properties of the material. Therefore, it is important to establish post-synthesis treatments to facilitate the optimization of surface properties with respect to a specific application, without losing the morphological peculiarity of the nanostructure. We studied the surface properties of highly crystalline and porous anatase TiO2 nanowire (NW) electrodes, grown by chemical-bath deposition in fluoride-containing solutions, using a combined electrochemical and spectroscopic approach. As-deposited films showed low capacity for catechol adsorption and a poor photoelectrocatalytic activity for water oxidation. Mild thermal annealing at 200 degrees C resulted in a significant improvement of the electrode photoelectrocatalytic activity, whereas the bulk properties of the NWs (crystal structure, band-gap energy) remained unchanged. Enhancement of the functional properties of the material is discussed on the basis of adsorption capacity and electronic properties. The temperature-induced decrease of recombination centers, along with the concomitant increase of adsorption and reaction sites upon thermal annealing are called to be responsible for such improved performance.
引用
收藏
页码:1676 / 1685
页数:10
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