Constrained Growth of MoS2 Nanosheets within a Mesoporous Silica Shell and Its Effects on Defect Sites and Catalyst Stability for H2S Decomposition,ACS Catalysis

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Constrained Growth of MoS2 Nanosheets within a Mesoporous Silica Shell and Its Effects on Defect Sites and Catalyst Stability for H2S Decomposition
ACS Catalysis ( IF 11.3 ) Pub Date : 2017-12-22 00:00:00 , DOI: 10.1021/acscatal.7b03123
Kelvin Mingyao Kwok _{1,

2} , Sze Wei Daniel Ong ₂ , Luwei Chen ₂ , Hua Chun Zeng ₁

Affiliation

Molybdenum disulfide (MoS₂) is a two-dimensional transition-metal dichalcogenide that can form layered nanosheets with catalytically active sites present at edge or defect sites. The density of such active sites can be further tuned by modifying the length, layer number, strain, and surface defects of the sheets. Herein, a synthetic approach has been developed to encapsulate nanoscale MoS₂ nanosheets inside a mesoporous silica shell. Small molybdenum(IV) oxide (MoO₂) cores were synthesized and coated with a mesoporous silica phase, followed by a conversion to MoS₂@SiO₂. The space constraint on the inner cores resulted in short, few-layered, highly curved MoS₂ nanosheets with circular or flowerlike morphology. The MoS₂@SiO₂ was evaluated as a catalyst for decomposition of hydrogen sulfide (H₂S), which shows high catalytic turnover frequency and superior thermal stability in comparison to unconstrained MoS₂ catalysts.

中文翻译：

MoS ₂纳米片在介孔二氧化硅壳中的受限生长及其对缺陷位和H ₂ S分解催化剂稳定性的影响

二硫化钼（MoS ₂）是一种二维过渡金属二硫化氢，可以形成层状纳米片，在边缘或缺陷部位具有催化活性部位。这些活性部位的密度可以通过改变片材的长度，层数，应变和表面缺陷来进一步调节。在本文中，已经开发了一种合成方法来将纳米级MoS ₂纳米片封装在介孔二氧化硅壳内。小钼（IV）氧化物（MoO ₂）核合成和涂覆有介孔二氧化硅相，接着通过转换到的MoS ₂ @SiO ₂。内芯上的空间约束导致短的，几层的，高度弯曲的MoS ₂具有圆形或花状形态的纳米片。评估了MoS ₂ @SiO ₂作为用于分解硫化氢（H ₂ S）的催化剂，与不受约束的MoS ₂催化剂相比，该催化剂显示出高的催化转换频率和优异的热稳定性。

更新日期：2017-12-22

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