MoVN-coated MoNi4 -MoO2 nanorods as a bifunctional electrode for Electrochemical water splitting

Yamini Kumaran, Iulian Gherasoiu, Maiyalagan Thandavarayan, Haralabos Efstathiadis
2023 · doi:10.21203/rs.3.rs-3439121/v1
preprint OA: closed CC-BY-4.0
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Abstract

MoVN/MoNi 4 -MoO 3 nanorods are synthesized using a two-step fabrication process consisting of the hydrothermal method and DC(V) and RF(Mo) magnetron co-sputtering technique. The resulting electrode exhibits a high surface area, that together with its intrinsic catalytic activity, achieves a synergistic effect, thereby improving the reaction kinetics of overall water splitting. The performance of the electrodes was tested in 1M KOH solution, to understand the reaction mechanisms and catalytic efficiency of both the half-cell reactions (Hydrogen Evolution Reaction and Oxygen Evolution Reaction). The electrodes performed exceptionally well with overpotentials of only 14 mV and 244 mV at 10 mA/cm 2 for HER and OER respectively compared to other electrode materials described previously in literature. Further, the stability of the electrodes was tested for 12 hours showing a negligible change in current density for both HER and OER reactions. Overall electrolysis was performed for 12 hours with the best electrode MoVN/MoNi 4 -MoO 2 needing only 1.56 V to reach 10 mA/cm 2 . Material characterization using X-ray Diffraction, Scanning Electron Microscopy, and Transmission Electron Microscopy were carried out for crystal structure and morphological analysis. X-ray photoelectron spectroscopy was performed to understand the nature of the surface species of the best-performing electrode and to study the degradation effects after electrolysis. Hence, this work uncovers the outstanding properties of the MoVN/MoNi 4 -MoO 2 electrode material with relatively high electrochemical surface area, low overpotential, and negligible degradation which could provide a competitive path to the fabrication of low-cost and highly effective electrodes for application in commercial electrolyzers.

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License: CC-BY-4.0