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Unraveling the Role of Lithium in Enhancing the Hydrogen Evolution Activity of MoS2: Intercalation versus Adsorption.

ABSTRACT: Molybdenum disulfide (MoS2) is a highly promising catalyst for the hydrogen evolution reaction (HER) to realize large-scale artificial photosynthesis. The metallic 1T'-MoS2 phase, which is stabilized via the adsorption or intercalation of small molecules or cations such as Li, shows exceptionally high HER activity, comparable to that of noble metals, but the effect of cation adsorption on HER performance has not yet been resolved. Here we investigate in detail the effect of Li adsorption and intercalation on the proton reduction properties of MoS2. By combining spectroscopy methods (infrared of adsorbed NO, 7Li solid-state nuclear magnetic resonance, and X-ray photoemission and absorption) with catalytic activity measurements and theoretical modeling, we infer that the enhanced HER performance of Li x MoS2 is predominantly due to the catalytic promotion of edge sites by Li.

SUBMITTER: Wu L 

PROVIDER: S-EPMC6630958 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature

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Unraveling the Role of Lithium in Enhancing the Hydrogen Evolution Activity of MoS<sub>2</sub>: Intercalation versus Adsorption.

Wu Longfei L   Dzade Nelson Y NY   Yu Miao M   Mezari Brahim B   van Hoof Arno J F AJF   Friedrich Heiner H   de Leeuw Nora H NH   Hensen Emiel J M EJM   Hofmann Jan P JP  

ACS energy letters 20190627 7

Molybdenum disulfide (MoS<sub>2</sub>) is a highly promising catalyst for the hydrogen evolution reaction (HER) to realize large-scale artificial photosynthesis. The metallic 1T'-MoS<sub>2</sub> phase, which is stabilized via the adsorption or intercalation of small molecules or cations such as Li, shows exceptionally high HER activity, comparable to that of noble metals, but the effect of cation adsorption on HER performance has not yet been resolved. Here we investigate in detail the effect of  ...[more]

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