Highly Durable Supportless Pt Hollow Spheres Designed for Enhanced Oxygen Transport in Cathode Catalyst Layers of Proton Exchange Membrane Fuel Cells
| Autor: | Young-Min Kim, Gu-Gon Park, Hwanuk Guim, Seonghun Cho, Sung-Dae Yim, Sun-Mi Hwang, Tae-Hyun Yang, Seok-Hee Park, Didem C. Dogan |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
020209 energy Oxygen transport chemistry.chemical_element Proton exchange membrane fuel cell Nanotechnology 02 engineering and technology Catalysis Membrane chemistry Chemical engineering Electrode 0202 electrical engineering electronic engineering information engineering General Materials Science Carbon Layer (electronics) Template method pattern |
| Zdroj: | ACS applied materialsinterfaces. 8(41) |
| ISSN: | 1944-8252 |
| Popis: | Supportless Pt catalysts have several advantages over conventional carbon-supported Pt catalysts in that they are not susceptible to carbon corrosion. However, the need for high Pt loadings in membrane electrode assemblies (MEAs) to achieve state-of-the-art fuel cell performance has limited their application in proton exchange membrane fuel cells. Herein, we report a new approach to the design of a supportless Pt catalyst in terms of catalyst layer architecture, which is crucial for fuel cell performance as it affects water management and oxygen transport in the catalyst layers. Large Pt hollow spheres (PtHSs) 100 nm in size were designed and prepared using a carbon template method. Despite their large size, the unique structure of the PtHSs, which are composed of a thin-layered shell of Pt nanoparticles (ca. 7 nm thick), exhibited a high surface area comparable to that of commercial Pt black (PtB). The PtHS structure also exhibited twice the durability of PtB after 2000 potential cycles (0-1.3 V, 50 mV/s). A MEA fabricated with PtHSs showed significant improvement in fuel cell performance compared to PtB-based MEAs at high current densities (800 mA/cm |
| Databáze: | OpenAIRE |
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