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In situ Deposition of Pt Catalyst Layers on Gas Diffusion Electrodes for Proton Exchange Membrane Fuel Cells
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SYSNO ASEP 0573735 Document Type A - Abstract R&D Document Type O - Ostatní Title In situ Deposition of Pt Catalyst Layers on Gas Diffusion Electrodes for Proton Exchange Membrane Fuel Cells Author(s) Garapati, Meenakshi Seshadhri (UT-L) RID, ORCID
Němec, Tomáš (UT-L) RID
Shapko, Dmytro (UT-L)Number of authors 3 Source Title Hydrogen Days 2023 : 13th International Conference on Hydrogen technologies. - Praha : The Czech Hydrogen Technology Platform HYTEP, 2023 / Stehlík K. - ISBN 978-80-907264-4-4
S. 38-38Number of pages 1 s. Publication form Print - P Action Hydrogen Days 2023 International Conference on Hydrogen technologies /13/. Event date 29.03.2023 - 31.03.2023 VEvent location Praha Country CZ - Czech Republic Event type WRD Language eng - English Country CZ - Czech Republic Keywords proton exchange membrane fuel cells ; oxygen reduction reaction ; membrane electrode assembly ; catalyst nanoparticles ; spark-discharge generator OECD category Nano-processes (applications on nano-scale) R&D Projects TM01000018 GA TA ČR - Technology Agency of the Czech Republic (TA ČR) Institutional support UT-L - RVO:61388998 Annotation Herein, the present work focuses on the direct deposition of Pt catalyst nanoparticles on gas-diffusion electrodes (GDE) and use as the electrodes of the membrane electrode assembly (MEA) for low-temperature proton exchange membrane fuel cells (PEMFC) without any additional treatments. This in situ deposition of catalyst nanoparticles does not involve any chemicals or solvents that can damage the Nafion membrane. Pt nanoparticles have been synthesized by spark-discharge generator (SDG), a gas-phase atmospheric-pressure synthesis process. SDG produced nanoparticles were deposited by filtration on standard GDE (SIGRACET® 36 BB) placed at the outlet. By variation of the carrier gas (N2 and forming gas (FG, N2 95 % + H2 5%) in the SDG, two kinds of Pt nanoparticles (Pt-N2 and Pt-FG) were obtained. At first, the oxygen reduction reaction (ORR) activity and durability of both nanoparticle samples were examined by the half-cell measurements, i.e., cyclic voltammetry, rotating-disk electrode, and accelerated durability tests. For MEA fabrication, in situ deposited Pt-N2 and FG catalysts on GDE (Pt loading 0.2 mg cm-2) are used as the anode and cathode. In the single-cell studies, MEA with Pt-FG catalyst delivers a power density of 644 mW cm-2 at 60 ⁰C and RH75%, which is higher than the Pt-N2 (500 mW cm-2) and commercial Pt-black (320 mW cm-2) catalysts. The performance of Pt-FG catalyst can be attributed to higher crystallinity and smaller particle size evaluated from X-ray diffraction and transmission electron microscopy measurements. Hence, the SDG technique can produce high-quality and in situ deposited PEMFC electrodes. Workplace Institute of Thermomechanics Contact Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823 Year of Publishing 2024
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