The rapid electrochemical activation of MoTe2 for the hydrogen evolution reaction

Jessica C. McGlynn (), Torben Dankwort, Lorenz Kienle, Nuno A. G. Bandeira, James P. Fraser, Emma K. Gibson, Irene Cascallana-Matías, Katalin Kamarás, Mark D. Symes, Haralampos N. Miras and Alexey Y. Ganin ()
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Jessica C. McGlynn: University of Glasgow
Torben Dankwort: University of Kiel
Lorenz Kienle: University of Kiel
Nuno A. G. Bandeira: C8-Faculdade de Ciências da Universidade de Lisboa
James P. Fraser: University of Glasgow
Emma K. Gibson: University of Glasgow
Irene Cascallana-Matías: University of Glasgow
Katalin Kamarás: Hungarian Academy of Sciences
Mark D. Symes: University of Glasgow
Haralampos N. Miras: University of Glasgow
Alexey Y. Ganin: University of Glasgow

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract The electrochemical generation of hydrogen is a key enabling technology for the production of sustainable fuels. Transition metal chalcogenides show considerable promise as catalysts for this reaction, but to date there are very few reports of tellurides in this context, and none of these transition metal telluride catalysts are especially active. Here, we show that the catalytic performance of metallic 1T′-MoTe2 is improved dramatically when the electrode is held at cathodic bias. As a result, the overpotential required to maintain a current density of 10 mA cm−2 decreases from 320 mV to just 178 mV. We show that this rapid and reversible activation process has its origins in adsorption of H onto Te sites on the surface of 1T′-MoTe2. This activation process highlights the importance of subtle changes in the electronic structure of an electrode material and how these can influence the subsequent electrocatalytic activity that is displayed.

Date: 2019
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DOI: 10.1038/s41467-019-12831-0

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