Electrodeposition of palladium-dotted nickel nanowire networks as a robust self-supported methanol electrooxidation catalyst
| Autor: | Prashant Khadke, Wolfgang Ensinger, Tim Boettcher, Falk Muench, Ulrike Kunz, Christina Roth, Matthew T. Mayer, Sasho Stojkovikj |
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| Rok vydání: | 2021 |
| Předmět: |
inorganic chemicals
Materials science Nanowire chemistry.chemical_element Nanoparticle 02 engineering and technology Electrocatalyst Electrochemistry Catalysis chemistry.chemical_compound 0502 economics and business General Materials Science 050207 economics Mechanical Engineering 05 social sciences 021001 nanoscience & nanotechnology Nickel nanowire networks chemistry Chemical engineering Mechanics of Materials electrodeposition Chemical Energy Carriers methanol electrooxidation catalyst Methanol 0210 nano-technology 500 Naturwissenschaften und Mathematik::540 Chemie::540 Chemie und zugeordnete Wissenschaften Palladium |
| DOI: | 10.17169/refubium-30756 |
| Popis: | Abstract Mass activity and long-term stability are two major issues in current fuel cell catalyst designs. While supported catalysts normally suffer from poor long-term stability but show high mass activity, unsupported catalysts tend to perform better in the first point while showing deficits in the latter one. In this study, a facile synthesis route towards self-supported metallic electrocatalyst nanoarchitectures with both aspects in mind is outlined. This procedure consists of a palladium seeding step of ion track-etched polymer templates followed by a nickel electrodeposition and template dissolution. With this strategy, free-standing nickel nanowire networks which contain palladium nanoparticles only in their outer surface are obtained. These networks are tested in anodic half-cell measurements for demonstrating their capability of oxidising methanol in alkaline electrolytes. The results from the electrochemical experiments show that this new catalyst is more tolerant towards high methanol concentrations (up to $${5}\,\hbox{mol}\,\hbox{L}^{-1}$$ 5 mol L - 1 ) than a commercial carbon supported palladium nanoparticle catalyst and provides a much better long-term stability during potential cycling. Graphical Abstract |
| Databáze: | OpenAIRE |
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