Atomic layer deposition of ultrathin layered TiO2 on Pt/C cathode catalyst for extended durability in polymer electrolyte fuel cells

This study shows the preparation of a TiO2 coated Pt/C (TiO2/Pt/C) by atomic layer deposition (ALD), and the examination of the possibility for TiO2/Pt/C to be used as a durable cathode catalyst in polymer electrolyte fuel cells (PEFCs). Cyclic voltammetry results revealed that TiO2/Pt/C catalyst wh...

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Bibliographic Details
Published in:Journal of energy chemistry 2016-03, Vol.25 (2), p.258-264
Main Authors: Chung, Sangho, Choun, Myounghoon, Jeong, Beomgyun, Lee, Jae Kwang, Lee, Jaeyoung
Format: Article
Language:English
Subjects:
Atomic layer deposition
Gas diffusion layer
Polymer electrolyte hydrogen fuel cells
Protective layer
Titanium dioxide
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Summary:This study shows the preparation of a TiO2 coated Pt/C (TiO2/Pt/C) by atomic layer deposition (ALD), and the examination of the possibility for TiO2/Pt/C to be used as a durable cathode catalyst in polymer electrolyte fuel cells (PEFCs). Cyclic voltammetry results revealed that TiO2/Pt/C catalyst which has 2nm protective layer showed similar activity for the oxygen reduction reaction compared to Pt/C catalysts and they also had good durability. TiO2/Pt/C prepared by 10 ALD cycles degraded 70% after 2000 Accelerated degradation test, while Pt/C corroded 92% in the same conditions. TiO2 ultrathin layer by ALD is able to achieve a good balance between the durability and activity, leading to TiO2/Pt/C as a promising cathode catalyst for PEFCs. The mechanism of the TiO2 protective layer used to prevent the degradation of Pt/C is discussed. Ultrathin TiO2 protective layer on Pt/C using atomic layer deposition for prohibited carbon oxidation in cathode catalyst of polymer electrolyte fuel cells. [Display omitted]
ISSN:2095-4956
DOI:10.1016/j.jechem.2016.01.010