Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Evaluating the Effect of Varying the Metal Precursor in The Colloidal Synthesis of MoSe2 Nanomaterials and Their Application as Electrodes in The Hydrogen Evolution Reaction

Version 1 : Received: 7 July 2020 / Approved: 8 July 2020 / Online: 8 July 2020 (10:53:12 CEST)

A peer-reviewed article of this Preprint also exists.

Ndala, Z.; Shumbula, N.; Nkabinde, S.; Kolokoto, T.; Nchoe, O.; Shumbula, P.; Tetana, Z.N.; Linganiso, E.C.; Gqoba, S.S.; Moloto, N. Evaluating the Effect of Varying the Metal Precursor in the Colloidal Synthesis of MoSe2 Nanomaterials and Their Application as Electrodes in the Hydrogen Evolution Reaction. Nanomaterials 2020, 10, 1786. Ndala, Z.; Shumbula, N.; Nkabinde, S.; Kolokoto, T.; Nchoe, O.; Shumbula, P.; Tetana, Z.N.; Linganiso, E.C.; Gqoba, S.S.; Moloto, N. Evaluating the Effect of Varying the Metal Precursor in the Colloidal Synthesis of MoSe2 Nanomaterials and Their Application as Electrodes in the Hydrogen Evolution Reaction. Nanomaterials 2020, 10, 1786.

Journal reference: Nanomaterials 2020, 10, 1786
DOI: 10.3390/nano10091786

Abstract

Herein we report on the use of different metal precursors in the synthesis of MoSe2 nanomaterials in order to control their morphology. The use of Mo(CO)6 as the metal precursor resulted in the formation of wrinkled few-layer nanosheets, while the use of H2MoO4 as the metal precursor resulted in the formation of nanoflowers. To investigate the effect of the morphologies on their performance as catalysts in the hydrogen evolution reaction, electrochemical characterization was done using linear sweep voltammetry, cyclic voltammetry and impedance spectroscopy. The MoSe2 nanomaterials were found to have superior electrochemical performance towards the hydrogen evolution reaction with a lower Tafel slope, on-set potential and potential at 10 mA/cm2 compared to the wrinkled few-layer nanosheets. This was found to be due to the higher effective electrochemical surface area of the nanoflowers compared to the nanosheets which suggests a higher number of exposed edge sites in the nanoflowers.

Subject Areas

Molybdenum diselenide; Colloidal synthesis; HER

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