Unraveling the role of Lithium in enhancing the hydrogen evolution activity of MoS2: intercalation versus adsorption

Longfei Wu, Nelson Y. Dzade, Miao Yu, Brahim Mezari, Arno van Hoof, Heiner Friedrich, Nora H. de Leeuw, Emiel Hensen, Jan Philipp Hofmann (Corresponding author)

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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 LixMoS2 is predominantly due to the catalytic promotion of edge sites by Li.
Original languageEnglish
Pages (from-to)1733-1740
Number of pages8
JournalACS Energy Letters
Volume4
Issue number7
DOIs
Publication statusPublished - 27 Jun 2019

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Intercalation
Lithium
Hydrogen
Adsorption
Cations
Positive ions
Photosynthesis
Photoemission
Precious metals
Molybdenum
Protons
Catalyst activity
Nuclear magnetic resonance
Spectroscopy
Infrared radiation
X rays
Catalysts
Molecules

Cite this

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title = "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 LixMoS2 is predominantly due to the catalytic promotion of edge sites by Li.",
author = "Longfei Wu and Dzade, {Nelson Y.} and Miao Yu and Brahim Mezari and {van Hoof}, Arno and Heiner Friedrich and {de Leeuw}, {Nora H.} and Emiel Hensen and Hofmann, {Jan Philipp}",
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T1 - Unraveling the role of Lithium in enhancing the hydrogen evolution activity of MoS2: intercalation versus adsorption

AU - Wu, Longfei

AU - Dzade, Nelson Y.

AU - Yu, Miao

AU - Mezari, Brahim

AU - van Hoof, Arno

AU - Friedrich, Heiner

AU - de Leeuw, Nora H.

AU - Hensen, Emiel

AU - Hofmann, Jan Philipp

PY - 2019/6/27

Y1 - 2019/6/27

N2 - 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 LixMoS2 is predominantly due to the catalytic promotion of edge sites by Li.

AB - 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 LixMoS2 is predominantly due to the catalytic promotion of edge sites by Li.

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