Controlled Decoration of Divalent Nickel onto CdS/CdSe Core/Shell Quantum Dots to Boost Visible-Light-Induced Hydrogen Generation in Water.,ChemPlusChem

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Controlled Decoration of Divalent Nickel onto CdS/CdSe Core/Shell Quantum Dots to Boost Visible-Light-Induced Hydrogen Generation in Water.
ChemPlusChem ( IF 3.0 ) Pub Date : 2018-11-02 , DOI: 10.1002/cplu.201800389
Ping Wang ₁ , Chuanping Li _{1,

2} , Minmin Wang _{1,

2} , Yongdong Jin ₁

Affiliation

The search for a low-cost, noble-metal-free cocatalyst to replace expensive Pt for hydrogen (H2 ) photogeneration in water has become a hot research topic, and among these, Ni-based cocatalysts are promising and highly desired. Developing new strategies and protocols to obtain Ni-based cocatalysts with high activity is therefore vitally important. Herein, we develop a new method to efficiently decorate divalent Ni onto pre-synthesized CdS/CdSe core/shell quantum dots (QDs). The concentration of Ni on the QDs can be easily tuned by varying the amount of the Ni precursor introduced during the synthesis. Further analyses reveal that Ni2+ can be strongly decorated onto QDs. Impressively, the Ni-decorated QDs displayed a significantly enhanced H2 photogeneration performance as compared to the two components prepared separately. Through the optimization of the Ni concentration on the QDs, the turnover frequency (TOF) with respect to Ni and quantum yield ( Φ H 2 ) at 520 nm for H2 evolution from water could reach 322 h-1 and 12.3 %, respectively. A possible mechanism has also been proposed and discussed in detail.

中文翻译：

在CdS / CdSe核/壳量子点上控制二价镍的修饰，以促进可见光诱导的水中氢气的产生。

寻求低成本，无贵金属的助催化剂来代替昂贵的Pt以在水中进行光生氢（H2）光生已成为热门的研究课题，其中，基于Ni的助催化剂是有前途的，并且是人们所迫切需要的。因此，开发新的策略和方案以获得具有高活性的镍基助催化剂至关重要。在这里，我们开发了一种新方法，可以有效地将二价镍修饰到预先合成的CdS / CdSe核/壳量子点（QD）上。通过改变合成过程中引入的Ni前驱体的数量，可以轻松调整QD上Ni的浓度。进一步的分析表明，Ni2 +可以牢固地装饰在量子点上。令人印象深刻的是，与单独制备的两种组分相比，镍装饰的量子点显示出显着增强的H2光生性能。通过优化QDs上的Ni浓度，从水中析出H2的相对于Ni的周转频率（TOF）和在520 nm处的量子产率（ΦH 2）可以分别达到322 h-1和12.3％。还已经提出并详细讨论了一种可能的机制。

更新日期：2018-11-02

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