Ultrasmall NiS decorated HNb3O8 nanosheeets as highly efficient photocatalyst for H-2 evolution reaction
Ultrasmall NiS decorated HNb3O8 nanosheeets as highly efficient photocatalyst for H-2 evolution reaction
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超小型 NiS 修饰的 HNb3O8 纳米片作为高效光催化剂用于析氢反应
DOI：
10.1016/j.cattod.2018.03.061
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发表时间：
2019
期刊：
影响因子：
5.3
通讯作者：
Wang Xuxu
中科院分区：
文献类型：
--
作者：
Xia Yuzhou;Liang Shijing;Wu Ling;Wang Xuxu
构建高性能、稳定的纳米复合光催化剂是光催化析氢反应的一大挑战，这主要是由于助催化剂与主体之间的界面接触不佳。在这项工作中，超小的NiS高度分散在HNb 3 O 82 D纳米片通过一个简单的静电吸附/自组装过程。有趣的是，层间空间位阻效应极大地抑制了NiS的生长，并在NiS和HNb 3 O 8纳米片之间形成了强烈的相互作用.而传统的共沉淀法和机械混合法对NiS进行改性，由于NiS与HNb 3 O 8纳米片之间的紧密接触，无法得到亚纳米尺寸的NiS。结果表明，在我们的方法制备的样品上，光生载流子的复合被大大抑制。此外，析氢反应的过电位也可以显着降低。因此，所制备的复合材料表现出显着提高的光催化析氢活性以及相当大的稳定性。最佳样品的放氢速率为1519.4 μmol g−1h−1，是裸片的17.4倍.活性也比通过机械混合方法制备的样品高一个数量级。此外，通过开发的方法制备的NiS/HNb 3 O 8显示出与Pt/HNb 3 O 8相当的活性以及过电位，表明铂的替代品。
The construction of high-performance and stable nanocomposite photocatalyst remains a great challenge toward photocatalytic hydrogen evolution reaction, which is mainly due to the mediocre interfacial contact between the cocatalyst and the host. In this work, ultrasmall NiS is highly dispersed on HNb3O82D nanosheet via a facile electrostatic adsorption/self-assembly process. Interestingly, the growth of NiS is greatly suppressed by the interlayered spatial steric inhibition effect and a strong interaction between NiS and HNb3O8nanosheet is formed. While the modification of NiS by the traditional methods, such as the coprecipitation and mechanical mixing methods, could not generate the sub-nanometer size of NiS with the tight contract between NiS and HNb3O8nanosheet. As a result, the recombination of the photogenerated carriers is greatly suppressed on the sample prepared by our method. Furthermore, the overpotential of hydrogen evolution reaction could also be reduced significantly. Thus, the as-prepared composite exhibits a markedly improved photocatalytic H2evolution activity as well as considerable stability. The optimal sample shows the H2evolution rate of 1519.4 μmol g−1h−1, which is about 17.4 times higher than that of the bare HNb3O8nanosheets. The activity is also a magnitude higher than that of the sample prepared by a mechanical mixing method. Additionally, NiS/HNb3O8prepared by the developed method shows a comparable activity as well as overpotential with Pt/HNb3O8, indicating an alternative to platinum.