Modulating the HER-overpotential at the interface of nanostructured MoS2 synthesized via hydrothermal route: An in-situ mass-spectroscopy approach

Hydrogen evolution reaction (HER) using a new exfoliated in-situ and amine-functionalized MoS2 prepared via a hydrothermal method, assisted with sonication treatment, is reported. Techniques such as XRD, RAMAN, FTIR, XPS, N2-physisorption and HRTEM, confirmed the production of different MoS2 samples...

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Bibliographic Details
Published in:International journal of hydrogen energy 2023-06, Vol.48 (47), p.17852-17867
Main Authors: González-Anota, Dante Esaí, Castañeda-Morales, Eleazar, Paredes-Carrera, Silvia Patricia, Manzo-Robledo, Arturo
Format: Article
Language:English
Subjects:
Electrocatalysis
HER-DEMS
Molybdenum disulfide
Selectivity-conversion
Ultrasonic-exfoliation
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Summary:Hydrogen evolution reaction (HER) using a new exfoliated in-situ and amine-functionalized MoS2 prepared via a hydrothermal method, assisted with sonication treatment, is reported. Techniques such as XRD, RAMAN, FTIR, XPS, N2-physisorption and HRTEM, confirmed the production of different MoS2 samples. Depending on the material, the overpotential for HER was modified; this was also observed for selected samples concerning the acid solution (HNO3, H2SO4, HCl, and HClO4), as demonstrated using linear sweep voltammetry and Tafel approach. The faradic current observed was in the order IHCLO4 > IHCl > IH2SO4 > IHNO3; whereas the charge-transfer resistance (ohms) was RHNO3 (29816) > RH2SO4 (311.5) > RHCl (167.7) > RHCLO4 (167.7). It was found (using DEMS) that protons (m/z = 1) modulated the generation of hydrogen (m/z = 2) at H2SO4, HCl, and HClO4 solutions; conversely, at HNO3 electrolyte, the reduction of NO3− to nitrogen was activated, delaying HER-kinetic. [Display omitted] •Biphasic amine-functionalized MoS2 prepared by a hydrothermal-ultrasound method.•In-situ generation of HER was modulated with amine-functionalized MoS2.•Protons adsorption modulated HER depending on acid in turn and applied potential.•The HER was delayed to produced nitrogen in HNO3 as demonstrated using DEMS.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2023.01.288