Enhancing the Hydrogen Evolution Reaction Performance of NiMo‐LDH With a Sputtering Modification
Journal
International Journal of Energy Research
Journal Volume
2025
Journal Issue
1
Start Page
1729717
ISSN
0363907X
Date Issued
2025
Author(s)
Abstract
Water electrolysis powered by renewable energy is a promising technology for green hydrogen production. Anion exchange membrane water electrolysis (AEMWE) has gained attention due to its ability to employ nonnoble metal catalysts. The development of efficient non-precious metal-based electrocatalysts for the hydrogen evolution reaction (HER) is particularly critical to reducing equipment costs. In this study, a NiMo metal thin film was deposited onto electrodeposited NiMo layered double hydroxide (NiMo-LDH) via a sputtering technique to tune the properties of the LDH layer. Material characterizations were conducted to investigate the structural and catalytic modifications induced by the sputtered NiMo layer. Furthermore, the practical application of the bilayer catalyst was evaluated in an AEM cell in a comparative analysis of cathode-dry and cathode-wet operation modes. The NiMo-LDH modified with the sputtered NiMo layer exhibited a lower onset potential and lower overpotential for HER. At a current density of 100 mA/cm2, the NiMo@NiMo-LDH on Ni fiber paper (NiMo@NiMo-LDH/NFP ∗) electrode showed an overpotential of 496.79 mV, significantly lower than that of the unmodified NiMo-LDH/NFP ∗ electrode (604.21 mV). In AEMWE system testing at 70°C and 1.8 V, the cathode-wet mode achieved a current density of 156.62 mA/cm2, outperforming the cathode-dry mode (115.30 mA/cm2). In the accelerated stress test (AST) stability test, after 5000 high/low current load cycles, the NiMo@NiMo-LDH/NFP ∗ (−)//SSP ∗ (+) cell exhibited only a +2.3% change in current density at 2 V, demonstrating great stability and application potential.
Subjects
anion exchange membrane water electrolysis
electrocatalyst
electrodeposition
hydrogen evolution reaction
NiMo-LDH
sputtering
SDGs
Publisher
John Wiley and Sons Ltd
Type
journal article