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Huge Instability of Pt/C Catalysts in Alkaline Medium
Open accessAbstract
The stability of carbon-supported electrocatalysts has been largely investigated in acidic electrolytes, but the literature is much scarcer regarding similar stability studies in alkaline medium. Herein, the degradation of Vulcan XC-72-supported platinum nanoparticles (noted Pt/C), a state-of-the-art proton exchange membrane fuel cell electrocatalyst, is investigated in alkaline medium by combining electrochemical measurements and identical location transmission electron microscopy; electrochemical surface area (ECSA) losses were bridged to electrocatalyst morphological changes. The results demonstrate that the degradation in 0.1 M NaOH at 25 °C is severe (60% of ECSA loss after only 150 cycles between 0.1 and 1.23 V vs RHE), which is about 3 times worse than in acidic media for this soft accelerated stress test. Severe carbon corrosion has been ruled out according to Raman spectroscopy and X-ray photoelectron spectroscopy measurements, and it seems that the chemistry of the carbon support (in particular, the interface (chemical bounding)) between the Pt nanoparticles and their carbon substrate does play a significant role in the observed degradations.
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Metadata
- Authors
- Zadick, A., Dubau, L., Sergent, N., Berthomé, G., & Chatenet, M.
- Venue
- ACS Catalysis
- Publisher
- American Chemical Society (ACS)
- Published
- 2015-07-21
- Volume
- 5
- Issue
- 8
- Pages
- 4819-4824
- ISSN
- 2155-5435 (ISSN-L)
- OpenAlex
- W2514882193
- Cited by
- 422
- References
- 21
- FWCI
- 9.58
- Type
- journal article
- Language
- en
- Open access
- green
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