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Growth of 1T′ MoTe 2 by thermally assisted conversion of electrodeposited tellurium films

Lookup NU author(s): Dr Toby Hallam

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Abstract

© 2018 American Chemical Society. Molybdenum ditelluride (MoTe 2 ) is a transition metal dichalcogenide (TMD) which has two phases stable under ambient conditions, a semiconducting (2H) and semimetallic (1T′) phase. Despite a host of interesting properties and potential applications, MoTe 2 is one of the less-studied TMDs, perhaps due its relatively low abundance in nature or challenges associated with its synthesis, such as the toxicity of most precursors. In this report, we describe the fabrication of thin films of phase-pure 1T′ MoTe 2 using predeposited molybdenum and electrodeposited tellurium layers, at the relatively low temperature of 450 °C. This method allows control over film geometry and over the tellurium concentration during the conversion. The MoTe 2 films are characterized by Raman spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, atomic force microscopy, and electron microscopies. When applied as a catalyst for the hydrogen evolution reaction, the films display promising initial results. The MoTe 2 films have a Tafel slope of below 70 mV dec -1 and compare favorably with other MoTe 2 catalysts reported in the literature, especially considering the inherently scalable fabrication method. The variation in electrocatalytic behavior with thickness and morphology of the films is also investigated.


Publication metadata

Author(s): McManus JB, Cunningham G, McEvoy N, Cullen CP, Gity F, Schmidt M, McAteer D, Mullarkey D, Shvets IV, Hurley PK, Hallam T, Duesberg GS

Publication type: Article

Publication status: Published

Journal: ACS Applied Energy Materials

Year: 2019

Volume: 2

Issue: 1

Pages: 521-530

Print publication date: 28/01/2019

Online publication date: 05/12/2018

Acceptance date: 05/12/2018

ISSN (electronic): 2574-0962

Publisher: American Chemical Society

URL: .htps://doi.org/10.1021/acsaem.8b01540

DOI: 10.1021/acsaem.8b01540


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