Here we present the synthesis of porous platinum–palladium macrobeams templated from high aspect ratio Magnus’ salt needle derivatives. The combination of [PtCl4]2− and/or [PdCl4]2− with [Pt(NH3)4]2+ ions results in salt needles ranging from 15 to 300 µm in length. Electrochemical reduction of the salt templates results in porous macrobeams with a square cross-section. Porous side wall texture and elemental composition was controlled with initial platinum to palladium salt ratio. Macrobeam free-standing films exhibited a specific capacitance up to 11.73 F/g and a solvent accessible surface area of 26.6 m2/g. These salt-templated porous platinum–palladium macrobeams offer a promising material for fuel cell catalysis.
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This work was funded by a United States Military Academy Faculty Development Research Fund grant. We appreciate the assistance with polarized optical microscopy from Lance Richardson from the Department of Chemistry and Life Science at the United States Military Academy.
These authors contributed equally.
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Burpo, F.J., Nagelli, E.A., Mitropoulos, A.N. et al. Salt-templated platinum–palladium porous macrobeam synthesis. MRS Communications 9, 280–287 (2019). https://doi.org/10.1557/mrc.2018.217