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Solid molybdenum nitride microdisc electrodes: Fabrication, characterisation, and application to the reduction of peroxodisulfate

A new methodology was developed to fabricate solid molybdenum nitride microdisc electrodes for the first time. The MoN microrods were produced by heating Mo microwires in dry NH3 atmosphere for several hours. They were characterised by scanning electron microscopy (SEM), energy dispersive spectrosco...

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Main Authors: Shafiee, Saiful 'Arifin, Hector, Andrew L., Denuault, Guy
Format: Article
Language:English
English
English
Published: Elsevier Ltd 2019
Subjects:
QD Chemistry
Online Access:http://irep.iium.edu.my/78068/1/78068_Solid%20molybdenum%20nitride.pdf
http://irep.iium.edu.my/78068/2/78068_Solid%20molybdenum%20nitride_SCOPUS.pdf
http://irep.iium.edu.my/78068/3/78068_Solid%20molybdenum%20nitride_WOS.pdf
http://irep.iium.edu.my/78068/
https://www.sciencedirect.com/science/article/pii/S001346861832276X
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spelling my.iium.irep.780682020-02-18T03:05:57Z http://irep.iium.edu.my/78068/ Solid molybdenum nitride microdisc electrodes: Fabrication, characterisation, and application to the reduction of peroxodisulfate Shafiee, Saiful 'Arifin Hector, Andrew L. Denuault, Guy QD Chemistry A new methodology was developed to fabricate solid molybdenum nitride microdisc electrodes for the first time. The MoN microrods were produced by heating Mo microwires in dry NH3 atmosphere for several hours. They were characterised by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The latter revealed the samples had crystallised in the δ3-MoN phase with a core of γ-Mo2N. Their electrochemical behaviour was probed for the reduction of Ru(NH3)63+. For this fast electron transfer the MoN microdisc electrodes returned similar voltammetric features to Pt microelectrodes. Their amperometric response was further tested with the reduction of peroxodisulfate. In contrast with other electrode materials, the reduction of S2O82− on MoN microdiscs delivered steady state voltammograms with well-defined diffusion controlled plateau. At low sweep rates, the limiting current was consistent with hemispherical diffusion and stable for at least 500 s. The diffusion coefficient of S2O82− derived from these results, 9.5 × 10−6 cm2 s−1, is in excellent agreement with previous work. At high sweep rates, the reduction of peroxodisulfate was found to be complicated by the simultaneous reduction of adsorbates. The results indicate that MoN is an ideal electrode material to monitor the concentration of peroxodisulfate under steady state conditions. Elsevier Ltd 2019-10-08 Article PeerReviewed application/pdf en http://irep.iium.edu.my/78068/1/78068_Solid%20molybdenum%20nitride.pdf application/pdf en http://irep.iium.edu.my/78068/2/78068_Solid%20molybdenum%20nitride_SCOPUS.pdf application/pdf en http://irep.iium.edu.my/78068/3/78068_Solid%20molybdenum%20nitride_WOS.pdf Shafiee, Saiful 'Arifin and Hector, Andrew L. and Denuault, Guy (2019) Solid molybdenum nitride microdisc electrodes: Fabrication, characterisation, and application to the reduction of peroxodisulfate. Electrochimica Acta, 293. pp. 184-190. ISSN 0013-4686 https://www.sciencedirect.com/science/article/pii/S001346861832276X 10.1016/j.electacta.2018.10.046
institution Universiti Islam Antarabangsa Malaysia
building IIUM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider International Islamic University Malaysia
content_source IIUM Repository (IREP)
url_provider http://irep.iium.edu.my/
language English
English
English
topic QD Chemistry
spellingShingle QD Chemistry
Shafiee, Saiful 'Arifin
Hector, Andrew L.
Denuault, Guy
Solid molybdenum nitride microdisc electrodes: Fabrication, characterisation, and application to the reduction of peroxodisulfate
description A new methodology was developed to fabricate solid molybdenum nitride microdisc electrodes for the first time. The MoN microrods were produced by heating Mo microwires in dry NH3 atmosphere for several hours. They were characterised by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The latter revealed the samples had crystallised in the δ3-MoN phase with a core of γ-Mo2N. Their electrochemical behaviour was probed for the reduction of Ru(NH3)63+. For this fast electron transfer the MoN microdisc electrodes returned similar voltammetric features to Pt microelectrodes. Their amperometric response was further tested with the reduction of peroxodisulfate. In contrast with other electrode materials, the reduction of S2O82− on MoN microdiscs delivered steady state voltammograms with well-defined diffusion controlled plateau. At low sweep rates, the limiting current was consistent with hemispherical diffusion and stable for at least 500 s. The diffusion coefficient of S2O82− derived from these results, 9.5 × 10−6 cm2 s−1, is in excellent agreement with previous work. At high sweep rates, the reduction of peroxodisulfate was found to be complicated by the simultaneous reduction of adsorbates. The results indicate that MoN is an ideal electrode material to monitor the concentration of peroxodisulfate under steady state conditions.
format Article
author Shafiee, Saiful 'Arifin
Hector, Andrew L.
Denuault, Guy
author_facet Shafiee, Saiful 'Arifin
Hector, Andrew L.
Denuault, Guy
author_sort Shafiee, Saiful 'Arifin
title Solid molybdenum nitride microdisc electrodes: Fabrication, characterisation, and application to the reduction of peroxodisulfate
title_short Solid molybdenum nitride microdisc electrodes: Fabrication, characterisation, and application to the reduction of peroxodisulfate
title_full Solid molybdenum nitride microdisc electrodes: Fabrication, characterisation, and application to the reduction of peroxodisulfate
title_fullStr Solid molybdenum nitride microdisc electrodes: Fabrication, characterisation, and application to the reduction of peroxodisulfate
title_full_unstemmed Solid molybdenum nitride microdisc electrodes: Fabrication, characterisation, and application to the reduction of peroxodisulfate
title_sort solid molybdenum nitride microdisc electrodes: fabrication, characterisation, and application to the reduction of peroxodisulfate
publisher Elsevier Ltd
publishDate 2019
url http://irep.iium.edu.my/78068/1/78068_Solid%20molybdenum%20nitride.pdf
http://irep.iium.edu.my/78068/2/78068_Solid%20molybdenum%20nitride_SCOPUS.pdf
http://irep.iium.edu.my/78068/3/78068_Solid%20molybdenum%20nitride_WOS.pdf
http://irep.iium.edu.my/78068/
https://www.sciencedirect.com/science/article/pii/S001346861832276X
_version_ 1662753798634864640
score 13.211869

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