In:
Angewandte Chemie, Wiley, Vol. 132, No. 9 ( 2020-02-24), p. 3629-3636
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‐MoS 2 nanosheets, MoS 2 , and WS 2 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 MoS 2 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 MoS 2 and WS 2 were revealed. The SECCM imaging directly visualized the relationship of HER activity and number of MoS 2 nanosheet layers and unveiled the heterogeneous aging state of MoS 2 nanosheets. SECCM can be used for improving local HER activities by producing sulfur vacancies using electrochemical reaction at the selected region.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.201912863
Language:
English
Publisher:
Wiley
Publication Date:
2020
detail.hit.zdb_id:
506609-8
detail.hit.zdb_id:
1479266-7