Cu Electrodeposition on Nanostructured MoS2 and WS2 and Implications for HER Active Site Determination

Longfei Wu, Nelson Y. Dzade, Ning Chen, Bas Van Dijk, Shashank Balasubramanyam, Akhil Sharma, Lu Gao, Dennis G.H. Hetterscheid, Emiel J.M. Hensen, Ageeth A. Bol, Nora H. De Leeuw, Jan P. Hofmann (Corresponding author)

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)

Abstract

Cu electrodeposition in both underpotential and overpotential regimes on nanostructured MoS2 and WS2 prepared by plasma-enhanced atomic layer deposition has been studied in detail. A combination of electrochemical methods, advanced characterization by X-ray absorption spectroscopy (XAS) as well as theoretical modelling were employed to reveal Cu adsorption modes on transition metal dichalcogenides (TMDs) from initial stages until bulk deposition. Since Cu UPD on TMDs has been used recently to evaluate the number of electrochemically active sites (NAS) for H2 evolution reaction, we evaluate and discuss here the implications of the Cu electrodeposition phenomena on nanostructured MoS2 and WS2 gauging the general applicability of the Cu UPD method for number of HER active sites determination in TMDs. Although an apparently better correlation of HER current density with Cu UPD charge than with double layer capacitance is found, the Cu UPD method cannot be used quantitatively because of the absence of a clear H UPD phenomenon on the studied nanostructured TMDs. This is in contrast to platinum group metal catalysts where H UPD and Cu UPD sites are strongly correlated.
Original languageEnglish
Article number116517
Number of pages8
JournalJournal of the Electrochemical Society
Volume167
Issue number11
DOIs
Publication statusPublished - 1 Nov 2020

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