Structure control of Pt-SnO₂catalyst for DEFC synthesized by electron beam irradiation method

Abstract

Carbon supported Pt-SnO 2 electrocatalysts with different Sn/Pt molar ratios were prepared by an electron beam irradiation method. Dissolved gas conditions in the vials irradiated with electron beam were controlled to air or Ar. The results of the material analyses showed that both Pt and SnO 2 were immobilized onto carbon support in all catalysts. Bubbling Ar to the precursor solution led to steady change of metal contents in response to the precursor concentrations. The ethanol oxidation activity plotted against Sn/Pt ratio behaved differently with dissolved gas condition of the vial. This difference is discussed with supposed existing state of SnO 2 in connection with the reduction process of Pt and Sn.

Radiochemical synthesis of a carbon-supported Pt–SnO2 bicomponent nanostructure exhibiting enhanced catalysis of ethanol oxidation

“…We have previously succeeded in synthesizing bicomponent nanoparticles immobilized on supports, such as Pt-Cu alloy and CuO in close contact with one another supported on -Fe 2 O 3 (Kugai et al, 2011, Yamamoto et al, 2010. We have also reported the application of this radiochemical method to the synthesis of Pt-SnO 2 nanoparticles (Okazaki et al, 2014). In the present study, we attempted to control the extent of contact between the Pt and SnO 2 phases by changing the dissolved gas in the precursor solution.…”