Same titanium glycolate precursor but different products: successful synthesis of twinned anatase TiO2 nanocrystals with excellent solar photocatalytic hydrogen evolution capability,Inorganic Chemistry Frontiers

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Same titanium glycolate precursor but different products: successful synthesis of twinned anatase TiO2 nanocrystals with excellent solar photocatalytic hydrogen evolution capability
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2017-06-20 00:00:00 , DOI: 10.1039/c7qi00278e
Gang Cheng _{1,

2,

3,

4} , Yi Wei _{1,

2,

3,

4} , Jinyan Xiong _{4,

5,

6,

7,

8} , Yixin Gan _{1,

2,

3,

4} , Jiaxin Zhu _{1,

2,

3,

4} , Feifan Xu _{1,

2,

3,

4}

Affiliation

Exploiting a synthesis protocol to tailor TiO₂ with a unique morphology and crystal phase has received considerable interest in the energy and environmental fields. We here describe the use of a titanium glycolate precursor in a hydrothermal hydrolysis reaction to engineer TiO₂ nanocrystals with different crystal phases and structures. Anatase TiO₂ nanocrystals with twinned structures were obtained by using a lower amount of NaOH in the hydrolysis system, while brookite TiO₂ nanocrystals were formed when higher amounts of NaOH were employed. The as-synthesized different TiO₂ nanocrystals have a suitable bandgap to harvest photons and a more negative bottom level of the conduction band than the redox potential of H⁺/H₂ indicating their potential as hydrogen-evolution semiconductor photocatalysts. However, the TiO₂ nanotwins show promoted charge separation efficiency, and thus result in superior photocatalytic H₂ generation activity compared to the anatase and brookite TiO₂ nanocrystals. Our findings provide an effective and versatile solution for the fabrication of TiO₂-based nanostructures with different phases and morphologies through chemical conversion of powder precursor nanoparticles, which could pave the way to the design of other functional nano-oxides with unique structures.

中文翻译：

相同的乙醇酸钛前体，但产品不同：成功合成具有优异的太阳能光催化制氢能力的孪晶锐钛矿型TiO ₂纳米晶体

利用合成方案来定制具有独特形态和晶相的TiO ₂已经在能源和环境领域引起了极大的兴趣。我们在这里描述了在水热水解反应中使用乙醇酸钛前体来工程化具有不同晶相和结构的TiO ₂纳米晶体。通过在水解体系中使用较少量的NaOH，可以得到具有孪晶结构的锐钛矿型TiO ₂纳米晶体，而当使用较高的NaOH时，则形成了板钛矿型TiO ₂纳米晶体。合成后的不同TiO ₂与H ⁺ / H ₂的氧化还原电势相比，纳米晶体具有合适的能带隙来收集光子和更负的导带底部能级，表明它们作为氢演化半导体光催化剂的潜力。然而，TiO ₂纳米孪晶显示出提高的电荷分离效率，因此与锐钛矿和板钛矿TiO ₂纳米晶体相比，产生了优异的光催化H ₂生成活性。我们的发现为制造TiO ₂提供了有效且通用的解决方案通过粉末前驱体纳米粒子的化学转化获得具有不同相和形态的基于纳米的纳米结构，这可以为设计具有独特结构的其他功能性纳米氧化物铺平道路。

更新日期：2017-08-08

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