Journal
JOURNAL OF CATALYSIS
Volume 416, Issue -, Pages 85-91Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2022.10.023
Keywords
Transition metal dichalcogenides; Scanning electrochemical microscopy; 2D materials; Titanium disulfide; Titanium diselenide; Molybdenum disulfide; Hydrogen; Corrosion
Categories
Funding
- Grant Agency of the Czech Republic [EXPRO: 19-26896X]
- European Union [888797]
- Quality Internal Grants of BUT (KInG BUT) from the OP RDE [CZ.02.2.69/0.0/0.0/19_073/0016948]
- MEYS CR [LM2018110]
- Marie Curie Actions (MSCA) [888797] Funding Source: Marie Curie Actions (MSCA)
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Transition metal dichalcogenides (TMDs) have emerged as promising materials for electrocatalysis, especially for the hydrogen evolution reaction (HER). In this study, the morphological and (electro)chemical changes of synthetic bulk crystals of MoS2, TiS2, and TiSe2 during HER were investigated. The results showed different degrees of corrosion in these materials, with TiSe2 > TiS2 > MoS2.
Among the vast field of 2D materials, transition metal dichalcogenides (TMDs) have emerged as promising materials for electrocatalysis. Many of them, such as MoS2, were found to be potent electrocatalysts for the hydrogen evolution reaction (HER), which is vital for making electrochemical water splitting, a green route for obtaining hydrogen, economically feasible. In this work, we investigated the morphological and (electro)chemical changes undergoing in synthetic bulk crystals of MoS2, TiS2, and TiSe2 during HER. Local electrochemical changes were observed using scanning electrochemical microscopy (SECM). Scanning electron microscopy (SEM) and confocal laser scanning microscopy (CLSM) were utilized to monitor morphological changes. Furthermore, the chemical composition of the materials was analyzed using X-ray photoelectron spectroscopy (XPS) and electron dispersive X-ray spectroscopy (EDS). Changes in the atomic structure were studied using X-ray diffraction (XRD). Our experiments showed different degrees of corrosion occurring in these materials, with the magnitude of corrosion decreasing in the order TiSe2 > TiS2 > MoS2. These findings are of tremendous importance for the development of transition metal dichalcogenide electrocatalysts, which are touted to replace platinum for hydrogen evolution reaction. (C) 2022 Elsevier Inc. All rights reserved.
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