Pt-Ni Aerogels as Unsupported Electrocatalysts for the Oxygen Reduction Reaction
| Autor: | Alexander Eychmüller, Matthias Werheid, Juan Herranz, Thomas J. Schmidt, Marion Adam, Maarten Nachtegaal, Tobias Binninger, Wei Liu, Julien Durst, Laura Kühn, Sebastian Henning, Stefan Kaskel |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Aqueous solution
Materials science Renewable Energy Sustainability and the Environment Oxide Nanoparticle Aerogel 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Electrochemistry 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Catalysis chemistry.chemical_compound Chemical engineering chemistry Phase (matter) Materials Chemistry 0210 nano-technology Bimetallic strip |
| Zdroj: | Journal of the Electrochemical Society, 163 (9) |
| ISSN: | 0013-4651 1945-7111 |
| DOI: | 10.3929/ethz-b-000119323 |
| Popis: | The commercial feasibility of polymer electrolyte fuel cells (PEFCs) passes by the development of Pt-based, O2-reduction catalysts with greater activities and/or lower Pt-contents, as well as an improved stability. In an effort to tackle these requirements, unsupported bimetallic Pt-Ni nanoparticles (NPs) interconnected in the shape of nanochain networks (aerogels) were synthesized using a simple one-step reduction and gel formation process in aqueous solution. The products of this novel synthetic route were characterized by X-ray absorption spectroscopy to elucidate the materials' structure. Using electrochemical experiments, we probed the surface composition of the as-synthesized aerogels and of equivalent materials exposed to acid, and concluded that a Ni-(hydr)oxide side phase is present in the aerogel with a larger Ni-concentration. Regardless of this initial surface composition, the Pt-Ni aerogels feature a ≈3-fold increase of surface-specific ORR activity when compared to a commercial platinum-on-carbon catalyst, reaching the mass-specific requirement for application in automotive PEFCs. Journal of the Electrochemical Society, 163 (9) ISSN:0013-4651 ISSN:1945-7111 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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