Co-Assembly of Nanoparticles in Evaporating Aerosol Droplets: Preparation of Nanoporous Pt/TiO2 Composite Particles
نویسندگان
چکیده
Nanoporous Pt/TiO2 micro-particles were synthesized via an aerosol assisted co-assembly (AACA) route. Aerosol droplets were produced from a colloidal mixture of 5 nm Pt and 20 nm TiO2 nanoparticles, which formed spherical micro-aggregates of Pt and TiO2 with average diameter of around 1.2 μm. The resulting composite micro-particles have very open structure with pore sizes ranging from 20 to 200 nm. Pt nanoparticles were found to be well dispersed on the surface of the supporting TiO2 particles. Electrocatalytic application of the nanoporous Pt/TiO2 composites was examined through methanol oxidation reaction. The performance of 20 wt% Pt/TiO2 particles was found to be comparable to that of commercial 20 wt% Pt/carbon black catalyst.
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