We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
MoVN-coated MoNi<sub>4</sub>-MoO<sub>2</sub> nanorods as a bifunctional electrode for electrochemical water splitting.
- Authors
Kumaran, Yamini; Gherasoiu, Iulian; Thandavarayan, Maiyalagan; Efstathiadis, Haralabos
- Abstract
MoVN/MoNi4-MoO2 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 1 M 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 h showing a negligible change in current density for both HER and OER reactions. Overall electrolysis was performed for 12 h with the best electrode MoVN/MoNi4-MoO2 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/MoNi4-MoO2 electrode material with relatively high electrochemical surface area, low overpotential for both half-cell reactions (HER and OER), and negligible degradation which could provide a competitive path to the fabrication of low-cost and highly effective electrodes for application in commercial electrolyzers.
- Subjects
ELECTROCHEMICAL electrodes; OXYGEN evolution reactions; ELECTRODE performance; X-ray photoelectron spectroscopy; NANORODS; PHOTOCATHODES
- Publication
Journal of Applied Electrochemistry, 2024, Vol 54, Issue 8, p1727
- ISSN
0021-891X
- Publication type
Article
- DOI
10.1007/s10800-023-02064-x