@article{7f74fefda64d440bbee2fba466f5219c,
title = "High-Resolution Electrochemical Mapping of the Hydrogen Evolution Reaction on Transition-Metal Dichalcogenide Nanosheets",
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 20 nm 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. 130 nm. 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.",
keywords = "MoS, electrochemistry, hydrogen evolution reaction, scanning electrochemical cell microscopy",
author = "Yasufumi Takahashi and Yu Kobayashi and Ziqian Wang and Yoshikazu Ito and Masato Ota and Hiroki Ida and Akichika Kumatani and Keisuke Miyazawa and Takeshi Fujita and Hitoshi Shiku and Korchev, {Yuri E.} and Yasumitsu Miyata and Takeshi Fukuma and Mingwei Chen and Tomokazu Matsue",
note = "Funding Information: World Premier International Research Center Initiative (WPI), MEXT, Japan; Development of Systems and Technology for Advanced Measurement and Analysis from AMED (The Japan Agency for Medical Research and Development)‐SENTAN; ALCA, PRESTO (JPMJPR14FA, JPMJPR18T8, JPMJPR1541), CREST (JPMJCR16F3, JPMJCR11C5) from the Japan Science and Technology Agency (JST); a Grant‐in‐Aid for Scientific Research (A) (16H02280, 19H00915), a Grant‐in‐Aid for Scientific Research (B) (15H03542, 18H01832), a Grant‐in‐Aid for Young Scientists (A) (15H05422 and 16H06042), a Grant‐in‐Aid for Exploratory Research (15K13263 and 17K19135), and a Grant‐in‐Aid for Scientific Research on Innovative Areas (16H00885) from the Japan Society for the Promotion of Science (JSPS); Asahi Glass Foundation; Grant‐in‐Aid for Young Scientists provided by Hokuriku bank; Murata Science Foundation; Intelligent Cosmos Academic Foundation are all thankfully acknowledged for financial support. This work is partially sponsored by Japan Society for the Promotion of Science (JSPS) Grant‐in‐Aid for Scientific Research on Innovative Areas “Science of Atomic Layers” (Grant JP26107504). Publisher Copyright: {\textcopyright} 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim",
year = "2020",
month = feb,
day = "24",
doi = "10.1002/anie.201912863",
language = "English",
volume = "59",
pages = "3601--3608",
journal = "Angewandte Chemie - International Edition",
issn = "1433-7851",
publisher = "John Wiley and Sons Ltd",
number = "9",
}