期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 59, 期 9, 页码 3601-3608出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201912863
关键词
electrochemistry; hydrogen evolution reaction; MoS2; scanning electrochemical cell microscopy
资金
- 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
- Japan Science and Technology Agency (JST) [JPMJPR14FA, JPMJPR18T8, JPMJPR1541, JPMJCR16F3, JPMJCR11C5]
- Japan Society for the Promotion of Science (JSPS) [16H02280, 19H00915, 15H03542, 18H01832, 15H05422, 16H06042, 15K13263, 17K19135, 16H00885, JP26107504]
- Asahi Glass Foundation
- Hokuriku bank
- Murata Science Foundation
- Intelligent Cosmos Academic Foundation
- EPSRC [EP/P011985/1, EP/I007482/1] Funding Source: UKRI
- Grants-in-Aid for Scientific Research [16H00885, 17K19135, 18H01832, 15K13263, 19H00915] Funding Source: KAKEN
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.
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