Methyl orange degradation enhanced by hydrogen spillover onto platinum nanocatalyst surface

Following a thermal reduction method, platinum nanoparticles were synthesized and stabilized by polyvinylpyrrolidone. The colloidal platinum nanoparticles were stable for more than 3 months. The micrograph analysis unveiled that the colloidal platinum nanoparticles were well dispersed with an average size of 2.53 nm. The sol-gel-based inverse micelle strategy was applied to synthesize mesoporous iron oxide material. The colloidal platinum nanoparticles were deposited on mesoporous iron oxide through the capillary inclusion method. The small-angle X-ray scattering analysis indicated that the dimension of platinum nanoparticles deposited on mesoporous iron oxide (Pt-Fe2O3) was 2.64 nm. X-ray photoelectron spectroscopy (XPS) data showed that the binding energy on Pt-Fe(2)O(3)surface decreased owing to mesoporous support-nanoparticle interaction. Both colloidal and deposited platinum nanocatalysts improved the degradation of methyl orange under reduction conditions. The activation energy on the deposited platinum nanocatalyst interface (2.66 kJ mol(-1)) was significantly lowered compared with the one on the colloidal platinum nanocatalyst interface (40.63 +/- 0.53 kJ mol(-1)).

Automated summary

In this study, platinum nanoparticles were synthesized and stabilized by polyvinylpyrrolidone through a thermal reduction method, with an average size of 2.53 nm and stability for over 3 months. Mesoporous iron oxide material was synthesized using a sol-gel-based inverse micelle strategy, and colloidal platinum nanoparticles were deposited on it, leading to a significant decrease in activation energy compared to the colloidal platinum nanocatalysts.