Au-TiO2/Ti Hybrid Coating as a Liquid and Gas Diffusion Layer with Improved Performance and Stability in Proton Exchange Membrane Water Electrolyzer

The liquid and gas diffusion layer is a key component of proton exchange membrane water electrolyzer (PEMWE), and its interfacial contact resistance (ICR) and corrosion resistance have a great impact on the performance and durability of PEMWE. In this work, a novel hybrid coating with Au contacts di...

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Bibliographic Details
Published in:Molecules (Basel, Switzerland) Switzerland), 2022-10, Vol.27 (19), p.6644
Main Authors: Liu, Gaoyang, Peng, Shanlong, Hou, Faguo, Fang, Baizeng, Wang, Xindong
Format: Article
Language:English
Subjects:
Brush plating
Chemical vapor deposition
Coatings
Contact resistance
Corrosion
Corrosion currents
Corrosion resistance
Diffusion coating
Diffusion layers
Durability
Electric contacts
Electrochemistry
Gaseous diffusion
Gold
Gold coatings
hybrid coating
Hydrochloric acid
Hydrogen
interfacial contact resistance
liquid and gas diffusion layer
Membranes
Metallizing
Morphology
Precious metals
Protective coatings
proton exchange membrane water electrolyzer
Scanning electron microscopy
Stability tests
Titanium
Titanium dioxide
X-ray diffraction
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Summary:The liquid and gas diffusion layer is a key component of proton exchange membrane water electrolyzer (PEMWE), and its interfacial contact resistance (ICR) and corrosion resistance have a great impact on the performance and durability of PEMWE. In this work, a novel hybrid coating with Au contacts discontinuously embedded in a titanium oxidized layer was constructed on a Ti felt via facile electrochemical metallizing and followed by a pre-oxidization process. The physicochemical characterizations, such as scanning electron microscopy, energy dispersive spectrometer, and X-ray diffraction results confirmed that the distribution and morphology of the Au contacts could be regulated with the electrical pulse time, and a hybrid coating (Au-TiO2/Ti) was eventually achieved after the long-term stability test under anode environment. At the compaction force of 140 N cm−2, the ICR was reduced from 19.7 mΩ cm2 of the P-Ti to 4.2 mΩ cm2 of the Au-TiO2/Ti. The corrosion current density at 1.8 V (RHE) is 0.689 μA cm−2. Both the ICR and corrosion resistance results showed that the prepared protective coating could provide comparable ICR and corrosion resistance to a dense Au coating.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules27196644