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Stabilizing the Unstable: Chromium Coating on NiMo Electrode for Enhanced Stability in Intermittent Water
Lingyi Peng1, Jie Min2, Avi Bendavid3
1School of Chemical Engineering, The University of New South Wales, Sydney, NSW 2052, Australia.
ACS Applied Materials & Interfaces
|August 29, 2022
Summary
Nickel-molybdenum electrodes degrade during intermittent electrolysis due to oxidation. Chromium coating prevents this degradation by blocking oxygen, enhancing stability for renewable energy applications.
Area of Science:
- Electrochemistry
- Materials Science
- Renewable Energy
Background:
- Water electrolysis is crucial for producing hydrogen using renewable energy.
- Nickel-molybdenum (NiMo) electrodes show promise for alkaline hydrogen evolution reaction (HER).
- NiMo electrodes degrade under intermittent power, common in renewable energy sources.
Purpose of the Study:
- Investigate NiMo electrode degradation during intermittent electrolysis.
- Identify the mechanism behind performance loss.
- Develop a strategy to enhance electrode stability.
Main Methods:
- Electrolysis experiments with constant and intermittent power supply.
- Analysis of electrode degradation mechanisms.
- Application and testing of chromium (Cr) coating.
- Molecular Dynamics (MD) simulations.
Main Results:
- NiMo electrodes oxidize and lose activity during power interruptions due to dissolved oxygen.
- Chromium coating effectively inhibits oxygen reduction reaction (ORR).
- Cr coating acts as a physical barrier, preventing oxygen diffusion while allowing other species.
- Enhanced stability of NiMo electrodes with Cr coating in intermittent electrolysis.
Conclusions:
- Dissolved oxygen causes NiMo electrode degradation via oxidation of Ni active sites and MoO substrate.
- Chromium coating is a viable method to protect NiMo electrodes from oxygen-induced degradation.
- This research provides a pathway for using NiMo electrodes in industrial-scale electrolysis powered by intermittent renewable energy sources.
Keywords:
alkaline hydrogen evolution reactionchromium coatingdissolved oxygenintermittent electrolysisnickel−molybdenumstabilityMore Related Videos
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