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

Abstract

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.

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Identifiers

ORCID for Andrew L. Hector: orcid.org/0000-0002-9964-2163

ORCID for Guy Denuault: orcid.org/0000-0002-8630-9492

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