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Ultrasonically-assisted synthesis of CeO2 within WS2 interlayers forming type II heterojunction for a VOC photocatalytic oxidation
Ultrasonics Sonochemistry ( IF 8.7 ) Pub Date : 2022-11-28 , DOI: 10.1016/j.ultsonch.2022.106245
Esmail Doustkhah 1 , Ramin Hassandoost 2 , Negar Yousef Tizhoosh 2 , Mohamed Esmat 3 , Olga Guselnikova 4 , M Hussein N Assadi 5 , Alireza Khataee 6
Affiliation  

Here, we investigate the band structure, density of states, photocatalytic activity, and heterojunction mechanism of WS2 with CeO2 (CeO2@WS2) as a photoactive heterostructure. In this heterostructure, CeO2′s growth within WS2 layers is achieved through ultrasonicating WS2 and intercalating CeO2′s precursor within the WS2 interlayers, followed by hydrothermal treatment. Through a set of density functional calculations, we demonstrate that CeO2 and WS2 form an interface through a covalent bonding that can be highly stable. The electrochemical impedance spectroscopy (EIS) found that the CeO2@WS2 heterostructure exhibits a remarkably higher conductivity (22.23 mS cm−2) compared to either WS2 and CeO2, assignable to the interface in CeO2@WS2. Furthermore, in a physically mixed CeO2-WS2 where the interaction between particles is noncovalent, the resistance was significantly higher (0.67 mS cm−2), confirming that the heterostructure in the interface is covalently bonded. In addition, Mott-Schottky and the bandgap measurements through Tauc plots demonstrate that the heterojunction in CeO2 and WS2 is type II. Eventually, the CeO2@WS2 heterostructure indicated 446.7 µmol g −1 CO2 generation from photocatalytic oxidation of a volatile organic compound (VOC), formic acid, compared to WS2 and CeO2 alone.



中文翻译:


超声波辅助合成 WS2 夹层内的 CeO2,形成 II 型异质结,用于 VOC 光催化氧化



在这里,我们研究了 WS 2与 CeO 2 (CeO 2 @WS 2 ) 作为光活性异质结构的能带结构、态密度、光催化活性和异质结机制。在该异质结构中,CeO 2在WS 2层内的生长是通过对WS 2进行超声处理并将CeO 2的前体插入到WS 2夹层内,然后进行水热处理来实现的。通过一组密度泛函计算,我们证明了CeO 2和WS 2通过共价键形成高度稳定的界面。电化学阻抗谱(EIS)发现,与WS 2和CeO 2相比,CeO 2 @WS 2异质结构表现出明显更高的电导率(22.23 mS cm -2 ),这归因于CeO 2 @WS 2中的界面。此外,在物理混合的CeO 2 -WS 2中,颗粒之间的相互作用是非共价的,电阻明显更高(0.67 mS cm -2 ),证实了界面中的异质结构是共价键合的。此外,莫特-肖特基和通过Tauc图的带隙测量表明CeO 2和WS 2中的异质结是II型。最终,与单独的WS 2和CeO 2相比,CeO 2 @WS 2异质结构表明,挥发性有机化合物(VOC)、甲酸的光催化氧化产生了446.7 µmol g -1 CO 2

更新日期:2022-12-03
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