The synthesis and investigation of the reversible conversion of layered ZrS2 and ZrS3,New Journal of Chemistry

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The synthesis and investigation of the reversible conversion of layered ZrS2 and ZrS3
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2020-04-13 , DOI: 10.1039/c9nj05631a
Viet Quang Dang _{1,

2,

3,

4} , Khalid Al-Ali _{5,

6,

7,

8,

9}

Affiliation

Metal sulfides, particularly zirconium sulfides, have been successfully synthesized from elemental zirconium and sulfur by a so-called diffusion method. The method allows one to control the morphology and phases of zirconium sulfides via tuning the reaction temperature and sulfur vapor pressure. At 550 °C and 650 °C, ZrS₃ nanobelts with a width from 90 to 160 nm and a thickness of about 26 ± 8 nm and 6 ± 2 μm in length were experimentally synthesized. Wider (from 90 to 743 nm) and longer (19.7 ± 3.4 μm) ZrS₃ nanobelts can be obtained by increasing the sulfur vapor pressure. Meanwhile, flake-like ZrS₂ particles were produced at 750 °C. Experimental observation revealed that the liquid–solid mechanism, in combination with sulfur intercalation, is likely a major mechanism that is responsible for the formation of ZrS₃ nanobelts. The reversible conversion between ZrS₃ and ZrS₂ has been observed for the first time by thermal decomposition of ZrS₃ at 650 °C and sulfurization of ZrS₂ in sulfur vapor at 550 °C. This result suggests a potential application of ZrS₂ in the H₂S splitting process for H₂ recovery.

中文翻译：

层状ZrS2和ZrS3可逆转化的合成与研究

已经通过元素扩散法从元素锆和硫中成功地合成了金属硫化物，特别是硫化锆。该方法允许通过调节反应温度和硫蒸气压来控制硫化锆的形态和相。在550°C和650°C下，实验合成了ZrS ₃纳米带，其宽度为90至160 nm，厚度约为26±8 nm，长度为6±2μm。通过增加硫蒸气压，可以获得更宽（从90到743 nm）和更长（19.7±3.4μm）的ZrS ₃纳米带。同时，片状ZrS ₂在750℃下产生颗粒。实验观察表明，液固机制与硫的嵌入结合可能是导致ZrS ₃纳米带形成的主要机制。通过在650°C下热分解ZrS ₃和在550°C下在硫蒸汽中硫化ZrS ₂首次观察到ZrS ₃和ZrS ₂之间的可逆转化。该结果表明ZrS ₂在用于H ₂回收的H ₂ S分裂过程中的潜在应用。

更新日期：2020-04-13

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