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Intercalation of cobaltocene into WS2 nanosheets for enhanced catalytic hydrogen evolution reaction

Authors
Kwak, In HyeAbbas, Hafiz GhulamKwon, Ik SeonPark, Yun ChangSeo, JaeminCho, Min KyungAhn, Jae-PyoungSeo, Hee WonPark, JeungheeKang, Hong Seok
Issue Date
14-4월-2019
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v.7, no.14, pp.8101 - 8106
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF MATERIALS CHEMISTRY A
Volume
7
Number
14
Start Page
8101
End Page
8106
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/66016
DOI
10.1039/c9ta01238a
ISSN
2050-7488
Abstract
We synthesized cobaltocene (7-20%)-intercalated WS2 nanosheets using a solvothermal process. The intercalation of cobaltocene between the expanded 1T phase WS2 layers was confirmed by scanning transmission electron microscopy and electron energy loss spectroscopy. The intercalated complexes exhibited excellent performance for the catalytic hydrogen evolution reaction, with a Tafel slope of 40 mV dec(-1) and a current density of 10 mA cm(-2) at 0.17 V (vs. RHE). Spin-polarized density functional theory calculations showed that cobaltocene is intercalated with a fivefold symmetry parallel to the WS2 plane, driven by substantial charge transfer. Reaction pathway calculations suggest that the basal S atoms just above the Co atom are the active sites, and the activation barrier of the Heyrovsky reaction determines the catalytic activity.
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