Polarization-enhanced photoelectrochemical properties of BaTiO3/BaTiO3−x/CdS heterostructure nanocubes,Dalton Transactions

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Polarization-enhanced photoelectrochemical properties of BaTiO3/BaTiO3−x/CdS heterostructure nanocubes
Dalton Transactions ( IF 3.5 ) Pub Date : 2021-2-16 , DOI: 10.1039/d1dt00103e
Mingjun Zhu _{1,

2,

3,

4} , Ganghua Zhang _{1,

2,

3,

4,

5} , Lianna Zhai _{1,

2,

3,

4} , Jianwu Cao _{1,

2,

3,

4} , ShaSha Li _{1,

2,

3,

4} , Tao Zeng _{1,

2,

3,

4,

6}

Affiliation

With the aim of improving the photocatalytic activity for water splitting, novel core–shell-structured crystalline-BaTiO₃/amorphous-BaTiO_3−x/crystalline-CdS composite nanocubes are prepared by a facile two-step synthesis approach. Basic characterization techniques such as X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy and transmission electron microscopy are carried out on the as-prepared composite nanocubes in order to confirm the quality of their crystal structure, morphology and chemical components correspondingly. UV-Vis-NIR measurements of the as-prepared composite nanocubes validate the presence of extended visible-light absorbance due to oxygen-deficient BaTiO_3−x. Photoelectrochemical tests are carried out on the as-prepared nanocomposite films that are coated directly on indium tin oxide (ITO) glass substrates. The as-prepared composite nanocubes show a photocurrent density of 100 μA cm⁻² without electric field poling, whereas they show about 200 μA cm⁻² with an electric field poling of 18.8 kV cm⁻¹. This study suggests that the photoelectrochemical performance is highest in our prepared BaTiO₃/BaTiO_3−x/CdS composite film compared to the pure BaTiO₃, CdS and BaTiO₃/BaTiO_3−x films, and it may offer a new potential route for designing cost-effective, highly stable and efficient photocatalysts.

中文翻译：

BaTiO3 / BaTiO3-x / CdS异质结构纳米立方体的偏振增强光电化学性能

为了提高水分解的光催化活性，通过一种简便的两步合成方法制备了新型核-壳结构的结晶BaTiO ₃ /非晶BaTiO _{3− x} /结晶CdS复合纳米立方体。对所制备的复合纳米立方体进行了基本的表征技术，如X射线衍射，扫描电子显微镜，能量色散X射线光谱和透射电子显微镜，以确认其晶体结构，形态和化学成分的质量。。制备的复合纳米立方体的UV-Vis-NIR测量证实了由于缺氧的BaTiO ₃₋_x而导致的可见光吸收范围扩大。在直接涂覆在氧化铟锡（ITO）玻璃基板上的制备好的纳米复合膜上进行光电化学测试。所制备的复合纳米立方体表现出100μA厘米的光电流密度^-2无电场极化，而它们显示出约200μA厘米^-2与电场极化18.8千伏厘米^-1。研究表明，与纯BaTiO ₃，CdS和BaTiO ₃ / BaTiO ₃₋_x相比，我们制备的BaTiO ₃ / BaTiO _{3− x} / CdS复合膜的光电化学性能最高。膜，它可能为设计经济高效，高度稳定和高效的光催化剂提供一条新的潜在途径。

更新日期：2021-02-26

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