Observation of H2 Evolution and Electrolyte Diffusion on MoS2 Monolayer by In Situ Liquid-Phase Transmission Electron Microscopy

Jihoon Kim; Anseong Park; Joodeok Kim; Seung Jae Kwak; Jae Yoon Lee; Donghoon Lee; Sebin Kim; Back Kyu Choi; Sungin Kim; Jimin Kwag; Younhwa Kim; Sungho Jeon; Won Chul Lee; Taeghwan Hyeon; Chul Ho Lee; Won Bo Lee; Jungwon Park

doi:10.1002/adma.202206066

Observation of H₂ Evolution and Electrolyte Diffusion on MoS₂ Monolayer by In Situ Liquid-Phase Transmission Electron Microscopy

Jihoon Kim, Anseong Park, Joodeok Kim, Seung Jae Kwak, Jae Yoon Lee, Donghoon Lee, Sebin Kim, Back Kyu Choi, Sungin Kim, Jimin Kwag, Younhwa Kim, Sungho Jeon, Won Chul Lee, Taeghwan Hyeon, Chul Ho Lee, Won Bo Lee, Jungwon Park

KU-KIST Graduate School of Converging Science and Technology

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

Unit-cell-thick MoS₂ is a promising electrocatalyst for the hydrogen evolution reaction (HER) owing to its tunable catalytic activity, which is determined based on the energetics and molecular interactions of different types of HER active sites. Kinetic responses of MoS₂ active sites, including the reaction onset, diffusion of the electrolyte and H₂ bubbles, and continuation of these processes, are important factors affecting the catalytic activity of MoS₂. Investigating these factors requires a direct real-time analysis of the HER occurring on spatially independent active sites. Herein, the H₂ evolution and electrolyte diffusion on the surface of MoS₂ are observed in real time by in situ electrochemical liquid-phase transmission electron microscopy (LPTEM). Time-dependent LPTEM observations reveal that different types of active sites are sequentially activated under the same conditions. Furthermore, the electrolyte flow to these sites is influenced by the reduction potential and site geometry, which affects the bubble detachment and overall HER activity of MoS₂.

Original language	English
Article number	2206066
Journal	Advanced Materials
Volume	34
Issue number	45
DOIs	https://doi.org/10.1002/adma.202206066
Publication status	Published - 2022 Nov 10

Bibliographical note

Funding Information:
J.K. and A.P. contributed equally to this work. J.K., J.K., B.K.C., S.K., J.K., T.H., and J.P. acknowledge the Institutes for Basic Science (Grant No. IBS‐R006‐D1). J.P. acknowledges the National Research Foundation of Korea (NRF) grant, funded by the Korea government (MSIT) (Grant No. NRF‐2021M3H4A1A02049904).

Publisher Copyright:
© 2022 Wiley-VCH GmbH.

Keywords

2D materials
H bubble formation
electrolyte insertion
hydrogen evolution reaction (HER)
molybdenum sulfide (MoS )

ASJC Scopus subject areas

Materials Science(all)
Mechanics of Materials
Mechanical Engineering

Access to Document

10.1002/adma.202206066

Cite this

Kim, J., Park, A., Kim, J., Kwak, S. J., Lee, J. Y., Lee, D., Kim, S., Choi, B. K., Kim, S., Kwag, J., Kim, Y., Jeon, S., Lee, W. C., Hyeon, T., Lee, C. H., Lee, W. B., & Park, J. (2022). Observation of H₂ Evolution and Electrolyte Diffusion on MoS₂ Monolayer by In Situ Liquid-Phase Transmission Electron Microscopy. Advanced Materials, 34(45), Article 2206066. https://doi.org/10.1002/adma.202206066

Kim, J, Park, A, Kim, J, Kwak, SJ, Lee, JY, Lee, D, Kim, S, Choi, BK, Kim, S, Kwag, J, Kim, Y, Jeon, S, Lee, WC, Hyeon, T, Lee, CH, Lee, WB & Park, J 2022, 'Observation of H₂ Evolution and Electrolyte Diffusion on MoS₂ Monolayer by In Situ Liquid-Phase Transmission Electron Microscopy', Advanced Materials, vol. 34, no. 45, 2206066. https://doi.org/10.1002/adma.202206066

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title = "Observation of H2 Evolution and Electrolyte Diffusion on MoS2 Monolayer by In Situ Liquid-Phase Transmission Electron Microscopy",

abstract = "Unit-cell-thick MoS2 is a promising electrocatalyst for the hydrogen evolution reaction (HER) owing to its tunable catalytic activity, which is determined based on the energetics and molecular interactions of different types of HER active sites. Kinetic responses of MoS2 active sites, including the reaction onset, diffusion of the electrolyte and H2 bubbles, and continuation of these processes, are important factors affecting the catalytic activity of MoS2. Investigating these factors requires a direct real-time analysis of the HER occurring on spatially independent active sites. Herein, the H2 evolution and electrolyte diffusion on the surface of MoS2 are observed in real time by in situ electrochemical liquid-phase transmission electron microscopy (LPTEM). Time-dependent LPTEM observations reveal that different types of active sites are sequentially activated under the same conditions. Furthermore, the electrolyte flow to these sites is influenced by the reduction potential and site geometry, which affects the bubble detachment and overall HER activity of MoS2.",

keywords = "2D materials, H bubble formation, electrolyte insertion, hydrogen evolution reaction (HER), molybdenum sulfide (MoS )",

author = "Jihoon Kim and Anseong Park and Joodeok Kim and Kwak, {Seung Jae} and Lee, {Jae Yoon} and Donghoon Lee and Sebin Kim and Choi, {Back Kyu} and Sungin Kim and Jimin Kwag and Younhwa Kim and Sungho Jeon and Lee, {Won Chul} and Taeghwan Hyeon and Lee, {Chul Ho} and Lee, {Won Bo} and Jungwon Park",

note = "Funding Information: J.K. and A.P. contributed equally to this work. J.K., J.K., B.K.C., S.K., J.K., T.H., and J.P. acknowledge the Institutes for Basic Science (Grant No. IBS‐R006‐D1). J.P. acknowledges the National Research Foundation of Korea (NRF) grant, funded by the Korea government (MSIT) (Grant No. NRF‐2021M3H4A1A02049904). Publisher Copyright: {\textcopyright} 2022 Wiley-VCH GmbH.",

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AU - Kim, Jihoon

AU - Park, Anseong

AU - Kim, Joodeok

AU - Kwak, Seung Jae

AU - Lee, Jae Yoon

AU - Lee, Donghoon

AU - Kim, Sebin

AU - Choi, Back Kyu

AU - Kim, Sungin

AU - Kwag, Jimin

AU - Kim, Younhwa

AU - Jeon, Sungho

AU - Lee, Won Chul

AU - Hyeon, Taeghwan

AU - Lee, Chul Ho

AU - Lee, Won Bo

AU - Park, Jungwon

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PY - 2022/11/10

Y1 - 2022/11/10

N2 - Unit-cell-thick MoS2 is a promising electrocatalyst for the hydrogen evolution reaction (HER) owing to its tunable catalytic activity, which is determined based on the energetics and molecular interactions of different types of HER active sites. Kinetic responses of MoS2 active sites, including the reaction onset, diffusion of the electrolyte and H2 bubbles, and continuation of these processes, are important factors affecting the catalytic activity of MoS2. Investigating these factors requires a direct real-time analysis of the HER occurring on spatially independent active sites. Herein, the H2 evolution and electrolyte diffusion on the surface of MoS2 are observed in real time by in situ electrochemical liquid-phase transmission electron microscopy (LPTEM). Time-dependent LPTEM observations reveal that different types of active sites are sequentially activated under the same conditions. Furthermore, the electrolyte flow to these sites is influenced by the reduction potential and site geometry, which affects the bubble detachment and overall HER activity of MoS2.

AB - Unit-cell-thick MoS2 is a promising electrocatalyst for the hydrogen evolution reaction (HER) owing to its tunable catalytic activity, which is determined based on the energetics and molecular interactions of different types of HER active sites. Kinetic responses of MoS2 active sites, including the reaction onset, diffusion of the electrolyte and H2 bubbles, and continuation of these processes, are important factors affecting the catalytic activity of MoS2. Investigating these factors requires a direct real-time analysis of the HER occurring on spatially independent active sites. Herein, the H2 evolution and electrolyte diffusion on the surface of MoS2 are observed in real time by in situ electrochemical liquid-phase transmission electron microscopy (LPTEM). Time-dependent LPTEM observations reveal that different types of active sites are sequentially activated under the same conditions. Furthermore, the electrolyte flow to these sites is influenced by the reduction potential and site geometry, which affects the bubble detachment and overall HER activity of MoS2.

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