Improving the Stability of Polymer Electrolyte Membrane Fuel Cells via Atomic Layer-Deposited Cerium Oxide

In this study, to enhance the stability of the cathode platinum (Pt) catalyst in polymer electrolyte membrane fuel cells, cerium oxide (CeOx) was deposited by plasma-enhanced atomic layer deposition (PEALD) process on the Pt catalyst sputtered on the cathode. A change in the peak power density loss...

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Bibliographic Details
Published in:International journal of energy research 2023-02, Vol.2023, p.1-9
Main Authors: Kim, Dong Joon, Jeong, Heon Jun, Shim, Jung Woo, Choi, Yun Sung, Lim, Jin Hyuk, Seo, Beum Geun, Shim, Joon Hyung
Format: Article
Language:English
Subjects:
Accelerated tests
Atomic layer epitaxy
Carbon
Catalysts
Cathode sputtering
Cathodes
Cations
Cerium
Cerium oxides
Deposition
Electrodes
Electrolytes
Electrolytic cells
Encapsulation
Energy
Free radicals
Fuel cells
Fuel technology
Hydrogen peroxide
Manufacturing
Membranes
Metal oxides
Oxidation
Oxidoreductions
Platinum
Polymers
Proton exchange membrane fuel cells
Redox reactions
Scanning electron microscopy
Stability
Transmission electron microscopy
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Summary:In this study, to enhance the stability of the cathode platinum (Pt) catalyst in polymer electrolyte membrane fuel cells, cerium oxide (CeOx) was deposited by plasma-enhanced atomic layer deposition (PEALD) process on the Pt catalyst sputtered on the cathode. A change in the peak power density loss after an accelerated stress test (AST) during I-V measurement of the membrane-electrode assembly according to the number of cycles was observed, which confirmed stability improvement. In polymer electrode membrane fuel cells (PEMFCs), free radicals lead to degradation of the performance and stability of catalysts; we used CeOx to prevent these problems. CeOx acts as a free radical scavenger through the redox reaction of Ce3+/4+ ions in the cell test and prevents oxidative hydroxyl and hydroperoxyl radical attack created in the reaction between hydrogen peroxide and released cations. By preventing oxidation, the stability was improved without decreasing the performance. Therefore, the improvement of stability through plasma-enhanced atomic layer deposition CeOx encapsulation can be considered a promising strategy for PEMFC catalysts.
ISSN:0363-907X
1099-114X
DOI:10.1155/2023/5506063