当前位置: X-MOL 学术Nano Res. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Mesocrystalline TiO2 nanosheet arrays with exposed {001} facets: Synthesis via topotactic transformation and applications in dye-sensitized solar cells
Nano Research ( IF 9.5 ) Pub Date : 2017-01-02 , DOI: 10.1007/s12274-017-1463-0
Yanhe Zhang , Jinguang Cai , Yurong Ma , Limin Qi

A facile, fluorine-free approach for synthesizing vertically aligned arrays of mesocrystalline anatase TiO2 nanosheets with highly exposed {001} facets was developed through topotactic transformation. Unique mesocrystalline {001}-faceted TiO2 nanosheet arrays vertically aligned on conductive fluorine-doped tin oxide glass were realized through topotactic conversion from single-crystalline precursor nanosheet arrays based on lattice matching between the precursor and the anatase crystals. The morphology and microstructure of the {001}-faceted TiO2 nanosheets could be readily modulated by changing the reactant concentration and annealing temperature. Owing to enhanced dye adsorption, reduced charge recombination, and enhanced light scattering arising from the exposed {001} facets, in addition to the advantageous features of low-dimensional structure arrays (e.g., fast electron transport and efficient charge collection), the obtained TiO2 nanosheet arrays exhibited superior performance when they were used as anodes for dye-sensitized solar cells (DSSCs). Particularly, {001}-faceted TiO2 nanosheet arrays ~15 μm long annealed at 500 °C showed a power conversion efficiency of 7.51%. Furthermore, a remarkable efficiency of 8.85% was achieved for a DSSC based on double-layered TiO2 nanosheet arrays ~35 μm long, which were prepared by conversion from the precursor nanoarrays produced via secondary hydrothermal growth.

Open image in new window


中文翻译:

介晶二氧化钛2个 {001}面暴露的纳米片阵列:通过全向变换合成及其在染料敏化太阳能电池中的应用

通过电位变换,开发了一种简便,无氟的方法来合成具有高度暴露的{001}面的介晶锐钛矿型TiO 2纳米片的垂直排列阵列。通过基于前体与锐钛矿晶体之间的晶格匹配,从单晶前体纳米片阵列进行位错转换,实现了在导电氟掺杂的氧化锡玻璃上垂直排列的独特的介晶{001}面TiO 2纳米片阵列。{001}面TiO 2的形貌和微观结构通过改变反应物浓度和退火温度可以容易地调节纳米片。除了低维结构阵列的有利功能(例如,快速的电子传输和高效的电荷收集)外,由于增强的染料吸附,减少的电荷重组以及暴露的{001}面所引起的增强的光散射,还获得了低分子结构阵列的优势(例如,快速的电子传输和高效的电荷收集)当将2个纳米片阵列用作染料敏化太阳能电池(DSSC)的阳极时,它们表现出优异的性能。特别地,在500℃下退火的长约15μm的{001}面TiO 2纳米片阵列显示了7.51%的功率转换效率。此外,基于双层TiO 2的DSSC达到了8.85%的显着效率 长约35μm的纳米片阵列,是通过二次水热生长产生的前体纳米阵列转化而制得的。

在新窗口中打开图像
更新日期:2017-01-02
down
wechat
bug