Increasing durability of Pt-surface-enriched nanosize structure catalysts by multi-step platinum deposition
| Autor: | Meital Goor, Emanuel Peled, Meital Shviro, Dmitri Kaplan, Larisa Burstein, Inna Popov |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Scanning electron microscope chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry 01 natural sciences Durability 0104 chemical sciences Catalysis chemistry X-ray photoelectron spectroscopy Chemical engineering General Materials Science Iridium Electrical and Electronic Engineering 0210 nano-technology Platinum Deposition (law) |
| Zdroj: | Journal of Solid State Electrochemistry. 24:2385-2393 |
| ISSN: | 1433-0768 1432-8488 |
| Popis: | The sluggish reaction of oxygen reduction in proton-exchange membrane fuel cells (PEMFCs) and the durability of platinum-based catalysts have been major economical and technological barriers to the widespread application of PEMFCs. We report here on two Pt-surface-enriched nanosize structure (Pt-SENS) catalysts with iridium core, synthesized with the use of single-step and successive step-by-step electroless deposition of platinum. The synthesized catalysts were studied by energy-dispersive X-ray spectroscopy (SEM-EDS), X-ray photoelectron spectroscopy (XPS), and transmission scanning electron microscopy (STEM). Electrochemical analysis demonstrated improved oxygen reduction reaction (ORR) mass activity of the homemade catalysts by 25–30% compared with commercial 50%Pt/C catalyst and improved durability, by a factor of ~ 3, of the catalyst synthesized by successive step-by-step deposition following accelerated stress test (AST). Higher mass activities are attributed to better platinum utilization as a result of a Pt-surface-enriched structure, while greater durability is attributed to the stabilization of surface platinum by stronger Pt–Ir bonds induced by iridium atoms in the core. |
| Databáze: | OpenAIRE |
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