Enhanced activity and stability of MoS2 through enriching 1T-phase by covalent functionalization for energy conversion applications

[Display omitted] •Active 1T-MoS2 nanosheets are covalently functionalized with n-butyl chains (~4%).•Introduction of n-butyl chains increased the interlayer spacing to 13.8 Å from ~9 Å.•Functionalization and solvent enrichment process improved the stability of 1T-MoS2.•en-Bu-1T-MoS2 showed superior...

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Veröffentlicht in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2021-01, Vol.403, p.126318, Article 126318
Hauptverfasser: Vedhanarayanan, Balaraman, Shi, Jing, Lin, Jeng-Yu, Yun, Sining, Lin, Tsung-Wu
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Sprache:eng
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Zusammenfassung:[Display omitted] •Active 1T-MoS2 nanosheets are covalently functionalized with n-butyl chains (~4%).•Introduction of n-butyl chains increased the interlayer spacing to 13.8 Å from ~9 Å.•Functionalization and solvent enrichment process improved the stability of 1T-MoS2.•en-Bu-1T-MoS2 showed superior performance in clean energy (HER & DSSC) applications. The selective enrichment of a highly active form/phase of material is essential for the development of potential candidates for specific applications. Herein, we demonstrate the first example of the covalent functionalization of a highly active 1T phase of outstanding 2D material, such as MoS2, and its enrichment (>94%) using a solvent extraction technique. Covalent functionalization stabilizes the metastable 1T phase with increased interlayer distance, which makes it a more suitable candidate for energy applications. The enriched functionalized 1T-MoS2 with n-butyl groups (en-Bu-1T-MoS2) shows a lower overpotential of 169 mV (vs. Reversible Hydrogen Electrode, RHE) with the loading mass of 0.9 mg cm−2 toward the hydrogen evolution reaction (HER). The continuous HER of en-Bu-1T-MoS2-based electrode for >200 h showed only
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2020.126318