A Salt-Templated Synthesis Method for Porous Platinum-based Macrobeams and Macrotubes

Area of Science:

• Materials Science
• Nanotechnology
• Inorganic Chemistry

Background:

• Traditional synthesis of porous noble metal nanomaterials is slow and yields fragile products.
• Existing methods involve nanoparticle coalescence, rinsing, and supercritical drying.

Purpose of the Study:

• To present a novel, rapid synthesis method for nanostructured porous platinum-based macrotubes and macrobeams.
• To demonstrate control over material morphology and composition.

Main Methods:

• Utilized insoluble salt needle templates formed from oppositely charged platinum, palladium, and copper ions.
• Controlled macrotube/macrobeam formation and nanostructure (fused nanoparticles or nanofibrils) via ion stoichiometry and reducing agent choice.
• Characterized elemental composition using X-ray diffractometry and X-ray photoelectron spectroscopy.

Main Results:

• Successfully synthesized porous platinum-based macrotubes and macrobeams with square cross sections.
• Demonstrated tunable elemental composition based on the salt-template's metal ion ratio.
• Showcased the ability to press materials into free-standing films with high electrochemically active surface area.

Conclusions:

• The presented method offers a simple and fast approach to high-surface area platinum-based materials.
• The synthesized macrotubes and macrobeams exhibit tunable nanostructure and composition.
• These materials are suitable for applications requiring free-standing, high-surface area electrodes.