Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 307, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2022.121156
Keywords
Pesudo-1 TMoS2; Reducible species; Structure modulation; Low crystallinity; Photo/electrocatalytic water splitting
Funding
- Opening Project of State Key Laboratory of Organic-Inorganic Composites [oic-202101001]
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This study reveals the role of reducible-NH and -NH2 species as structural stabilizers in supporting the lamellar structure of 1T MoS2, and proposes a novel strategy to modulate the crystallinity and layer thickness of 1T MoS2 for promoting its catalytic activity.
2D-layered metallic molybdenum disulfide i.e. 1T MoS2 possess prominent electronic conductivity and abundant electrochemically active sites. However, tuning its metastable crystal structure for promoting catalytic performance is a big technical challenge. Here, we reveal the role of the intercalated reducible-NH and-NH2 species as structural stabilizers in supporting the lamellar structure of 1T MoS2, and then propose a novel H2O2-cleaning strategy to reduce the amount of reducible-NH and-NH2 species for modulating the crystallinity and layer thickness of 1T MoS2 without degrading to 2H MoS2. The resultant pseudo-1T MoS2 exhibits larger specific surface area (up by 1.6 times) and higher electron mobility compared to original 1T MoS2, leading to excellent photo/electrocatalytic HER activity. Impressively, pseudo-1T MoS2 achieves high visible-light-driven photo-catalytic HER rate of 235.0 mmol.h(-1).g(-1) in combination with CdS. This work offers an extendable crystal structural fine-tuning approach to promote the catalytic activity of metallic transition metal dichalcogenides.
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