High-Resolution Electrochemical Mapping of the Hydrogen Evolution Reaction on Transition-Metal Dichalcogenide Nanosheets.

Takahashi, Yasufumi; Kobayashi, Yu; Wang, Ziqian; Ito, Yoshikazu; Ota, Masato; Ida, Hiroki; Kumatani, Akichika; Miyazawa, Keisuke; Fujita, Takeshi; Shiku, Hitoshi; Korchev, Yuri E; Miyata, Yasumitsu; Fukuma, Takeshi; Chen, Mingwei; Matsue, Tomokazu

Takahashi, Yasufumi; Kobayashi, Yu; Wang, Ziqian; Ito, Yoshikazu; Ota, Masato; Ida, Hiroki; Kumatani, Akichika; Miyazawa, Keisuke; Fujita, Takeshi; Shiku, Hitoshi; Korchev, Yuri E; Miyata, Yasumitsu; Fukuma, Takeshi; Chen, Mingwei; Matsue, Tomokazu.

Afiliación

Takahashi Y; WPI Nano Life Science Institute (NanoLSI, WPI), Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa, 920-1192, Japan.
Kobayashi Y; Precursory Research for Embryonic Science and Technology, (PRESTO) (Japan), Science and Technology Agency (JST), Saitama, 332-0012, Japan.
Wang Z; Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan.
Ito Y; Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD, 21218, USA.
Ota M; Precursory Research for Embryonic Science and Technology, (PRESTO) (Japan), Science and Technology Agency (JST), Saitama, 332-0012, Japan.
Ida H; Institute of Applied Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8573, Japan.
Kumatani A; WPI Nano Life Science Institute (NanoLSI, WPI), Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa, 920-1192, Japan.
Miyazawa K; Graduate School of Environmental Studies, Tohoku University, 6-6-11-604, Aramaki Aoba, Aoba-ku, Sendai, 980-8579, Japan.
Fujita T; Graduate School of Environmental Studies, Tohoku University, 6-6-11-604, Aramaki Aoba, Aoba-ku, Sendai, 980-8579, Japan.
Shiku H; WPI-Advanced Institute for Materials Research (AIMR), Tohoku University, 2-1-1-509, Katahira, Aoba-ku, Sendai, 980-8577, Japan.
Korchev YE; WPI Nano Life Science Institute (NanoLSI, WPI), Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa, 920-1192, Japan.
Miyata Y; School of Environmental Science and Engineering, Kochi University of Technology, Kochi, 782-8502, Japan.
Fukuma T; Department of Applied Chemistry, Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan.
Chen M; WPI Nano Life Science Institute (NanoLSI, WPI), Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa, 920-1192, Japan.
Matsue T; Department of Medicine, Imperial College London, London, W12 0NN, UK.

Angew Chem Int Ed Engl ; 59(9): 3601-3608, 2020 Feb 24.

Article en En | MEDLINE | ID: mdl-31777142

ABSTRACT

ABSTRACT

High-resolution scanning electrochemical cell microscopy (SECCM) is used to image and quantitatively analyze the hydrogen evolution reaction (HER) catalytically active sites of 1H-MoS2 nanosheets, MoS2 , and WS2 heteronanosheets. Using a 20ânm radius nanopipette and hopping mode scanning, the resolution of SECCM was beyond the optical microscopy limit and visualized a small triangular MoS2 nanosheet with a side length of ca. 130ânm. The electrochemical cell provides local cyclic voltammograms with a nanoscale spatial resolution for visualizing HER active sites as electrochemical images. The HER activity difference of edge, terrace, and heterojunction of MoS2 and WS2 were revealed. The SECCM imaging directly visualized the relationship of HER activity and number of MoS2 nanosheet layers and unveiled the heterogeneous aging state of MoS2 nanosheets. SECCM can be used for improving local HER activities by producing sulfur vacancies using electrochemical reaction at the selected region.

Palabras clave

MoS2; electrochemistry; hydrogen evolution reaction; scanning electrochemical cell microscopy

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Texto completo: 1 Bases de datos: MEDLINE Idioma: En Revista: Angew Chem Int Ed Engl Año: 2020 Tipo del documento: Article País de afiliación: Japón