VULCAN-SUPPORTED Pt ELECTROCATALYSTS FOR PEMFCs PREPARED USING SUPERCRITICAL CARBON DIOXIDE DEPOSITION
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In this study, supercritical carbon dioxide (scCO2) deposition was used to prepare vulcan-supported Pt (Pt/Vulcan) electrocatalysts for proton exchange membrane fuel cells (PEMFCs), and the effects of process variables on the properties of the electrocatalysts were investigated. The two different methods used to reduce the organometallic precursor were thermal reduction in nitrogen at atmospheric pressure and thermal reduction in scCO2. In the former method, the maximum Pt loading achieved was 9%, and this was governed by the adsorption isotherm of the Pt precursor between the scCO2 phase and the Vulcan phase. By using the latter method, higher Pt loadings of 15% and 35% could be achieved. The Pt/Vulcan catalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and cyclic voltammetry (CV). The average particle sizes for Pt/Vulcan 9%, 15%, and 35% catalysts were 1.2, 1.3, and 2 nm, respectively. Electrochemical surface areas obtained from CV data were found to vary with the Pt loading.
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SCD in combination with aerogels eliminates the risk of meso- and micropore deformation or collapse during impregnation of the Pt precursor and during depressurization, due to the absence of capillary forces in the supercritical state.
“SCD can be considered a particularly attractive technique in combination with aerogels, since the risk of meso- and micropore deformation or collapse during the impregnation of Pt precursor and during the depressurization is eliminated due to the absence of capillary forces in the supercritical state.[55–59]”
From Synthesis of Pt Carbon Aerogel Electrocatalysts with Multiscale Porosity Derived from Cellulose and Chitosan Biopolymer Aerogels via Supercritical Deposition for Hydrogen Evolution Reaction (2025) · cites this paper as [57]
The Introduction and Conclusion describe impregnating Vulcan carbon black with a Pt precursor in supercritical CO₂, not using aerogels. Searches for capillary forces, pore collapse, and deformation found no passage stating that this process eliminates those risks during impregnation or depressurization; the References list aerogel studies but do not establish the claim. (LLM, conf=0.74)
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Research works printed but not linked: 3
- Hoogers, G., ed. (2003). Fuel Cell Technology Handbook, CRC Press, Boca Raton, Fla.
- Zhang, Y. and Erkey, C. (2006). Preparation of supported metallic nanoparticles using super- critical fluids: A review, J. Supercrit. Fluids, 38, 252-267.
- Zhang, J., Wang, X., Wu, C., Wang, H., Yi, B., and Zhang, H. (2004). Preparation and char- acterization of Pt=C catalysts for PEMFC cathode: Effect of different reduction methods, React. Kinet. Catal. Lett., 83(2), 229-236.
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Alsuhile, A., Pein, P. S., Barım, Ş. B., Bozbağ, S. E., Smirnova, I., Erkey, C., & Schroeter, B. (2025) · Advanced Energy and Sustainability Research · doi:10.1002/aesr.202400433 · Cited by 8 · see citing works
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- Authors
- Bayrakçeken, A., Smirnova, A., Kitkamthorn, U., Aindow, M., Türker, L., Eroğlu, İ., & Erkey, C.
- Affiliations
- University of Connecticut (US)
- Suranaree University of Technology (TH)
- Middle East Technical University (TR)
- Koç University (TR)
- Corresponding author
- Erkey, Can
- Venue
- Chemical Engineering Communications
- Publisher
- Informa UK Limited
- Published
- 2008-10-08
- Volume
- 196
- Issue
- 1-2
- Pages
- 194-203
- ISSN
- 0098-6445 (ISSN-L)
- 1563-5201
- OpenAlex
- W2125889592
- Cited by
- 27
- References
- 0
- Citations by year
- 2026: 2 · 2025: 2 · 2024: 1 · 2023: 1 · 2022: 3 · 2021: 1 · 2020: 3 · 2019: 2 · 2017: 1 · 2016: 1 · 2014: 4 · 2013: 1 · 2012: 1
- FWCI
- 1.20
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Chemical Engineering Communications (publishedVersion)
- OpenMETU (Middle East Technical University) (submittedVersion, cc-by-nc-nd)
- Funders
- Orta Doğu Teknik Üniversitesi
- Topics
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Fuel Cells and Related Materials
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Electrocatalysts for Energy Conversion
- Physical Sciences › Materials Science › Materials Chemistry › Catalytic Processes in Materials Science
- Keywords
- platinum electrocatalysts, Vulcan carbon support, proton exchange membrane fuel cells, platinum loading, platinum particle size, electrochemically active surface area, hydrogen oxidation
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