Hydrogen Evolution at Liquid|Liquid Interfaces Catalysed by 2D Materials

Wisit Hirunpinyopas, Andrew Rodgers, Stephen D Worrall, Mark Bissett, |R Dryfe

Research output: Contribution to journalArticle

Abstract

The hydrogen evolution reaction (HER) plays a crucial role in clean energy production in hydrogen fuel cells. In order to utilise this process effectively, new catalysts are required that are cheap, non-toxic and efficient. In this context, 2D materials such as transition metal dichalcogenides (e.g. MoS2) should offer the desired properties but have so far proven difficult to manufacture into useful devices. In this work, liquid|liquid interfaces are used for the assembly and testing of the catalytic efficiency of a number of 2D materials and their composites, exploiting the ability of the materials to self-assemble at these interfaces and be tested electrochemically in situ. MoS2, WS2, and graphene were developed for hydrogen evolution at the water|1,2-dichlorobenzene (DCB) interface. The exfoliation process was carried out in DCB and resulted in multi-layer MoS2, few layer WS2 and graphene: when assembled at the water|DCB interface, these materials acted as efficient HER catalysts. HER was investigated using voltammetry, with bulk reaction kinetics monitored by in-situ UV-visible spectroscopy at a constant potential. MoS2 exhibited the highest performance of the catalysts examined, with an average rate constant of 0.0132 ± 0.063 min-1 at an applied Galvani potential of +0.5 V. This is ascribed to the sulphur edge sites of MoS2, which are known to be active for hydrogen evolution predominantly.
Original languageEnglish
Pages (from-to)428-435
JournalChemNanoMat
Early online date18 May 2017
DOIs
Publication statusPublished - 1 Jun 2017

Bibliographical note

This is the peer reviewed version of the following article: W. Hirunpinyopas, A. N. J. Rodgers, S. D. Worrall, M. A. Bissett, R. A. W. Dryfe, ChemNanoMat 2017, 3, 428, which has been published in final form at https://doi.org/10.1002/cnma.201700047.  This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.

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