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Article

In Situ Study of Graphene Oxide Quantum Dot-MoSx Nanohybrids as Hydrogen Evolution Catalysts

1
Dipartimento di Scienze Chimiche, Università di Padova, Via Marzolo 1, 35131 Padova, Italy
2
Finden Ltd., 1.12 Building R71, Harwell Campus, Oxfordshire OX11 0QZ, UK
3
School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, UK
*
Author to whom correspondence should be addressed.
Present address: Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Institute for Solar Fuels, Hahn-Meitner-Platz 1, D-14109 Berlin, Germany.
Present address: School of Chemistry, University of Bristol, Cantocks Close, Bristol BS8 1TS, UK.
Surfaces 2020, 3(2), 225-236; https://doi.org/10.3390/surfaces3020017
Received: 10 May 2020 / Revised: 3 June 2020 / Accepted: 5 June 2020 / Published: 16 June 2020
(This article belongs to the Special Issue Surface Science and Catalysis of Graphene-Related 2D Materials)
Graphene quantum dots (GOQDs)-MoSx nanohybrids with different MoSx stoichiometries (x = 2 and 3) were prepared in order to investigate their chemical stability under hydrogen evolution reaction (HER) conditions. Combined photoemission/electrochemical (XPS/EC) measurements and operando X-ray absorption spectroscopy (XAS) were employed to determine the chemical changes induced on the MoSx-based materials as a function of the applied potential. This in situ characterization indicates that both MoS2 and MoS3 materials are stable under operating conditions, although sulfur terminal sites in the MoS3 nanoparticles are converted from S-dimer (S22−) to S-monomer (S2−), which constitute the first sites where the hydrogen atoms are adsorbed for their subsequent evolution. In order to complete the characterization of the GOQDs-MoSx nanohybrids, the composition and particle size were determined by X-ray photoemission spectroscopy (XPS), X-ray diffraction (XRD) and Raman spectroscopy; whereas the HER activity was studied by conventional electrochemical techniques. View Full-Text
Keywords: in line XPS-electrochemistry; operando XAS; HER in line XPS-electrochemistry; operando XAS; HER
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MDPI and ACS Style

Favaro, M.; Cattelan, M.; Price, S.W.T.; Russell, A.E.; Calvillo, L.; Agnoli, S.; Granozzi, G. In Situ Study of Graphene Oxide Quantum Dot-MoSx Nanohybrids as Hydrogen Evolution Catalysts. Surfaces 2020, 3, 225-236. https://doi.org/10.3390/surfaces3020017

AMA Style

Favaro M, Cattelan M, Price SWT, Russell AE, Calvillo L, Agnoli S, Granozzi G. In Situ Study of Graphene Oxide Quantum Dot-MoSx Nanohybrids as Hydrogen Evolution Catalysts. Surfaces. 2020; 3(2):225-236. https://doi.org/10.3390/surfaces3020017

Chicago/Turabian Style

Favaro, Marco; Cattelan, Mattia; Price, Stephen W.T.; Russell, Andrea E.; Calvillo, Laura; Agnoli, Stefano; Granozzi, Gaetano. 2020. "In Situ Study of Graphene Oxide Quantum Dot-MoSx Nanohybrids as Hydrogen Evolution Catalysts" Surfaces 3, no. 2: 225-236. https://doi.org/10.3390/surfaces3020017

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