Comparison the Rapid Microwave-Assisted Polyol Route and Modified Chemical Reduction Methods to Synthesize The Pt Nanoparticles on the Ti_(0.7)W_(0.3)O_2 Support

摘要

The tungsten-modified titanium dioxide, which prepared through the one-pot solvothermal process, exhibited the large specific surface area (～ 202 m~2/g) and greater electrical conductivity (～ 0.022 S/cm). Furthermore, for the comparison purpose to find appropriate approach for the synthesis 20 wt. % Pt NPs/Ti_(0.7)W_(0.3)O_2 catalyst, the modified chemical reduction utilizing NaBH_4 and the rapid microwave-assisted polyol using ethylene glycol were employed without any surfactants or stabilizers. The characterization of Pt-based electrocatalyst was investigated through XRD, SEM-EDX, TEM measurements. As result, the platinum nanocatalyst formation with the face-centered cubic structure (fcc) and the amount loading on Ti_(0.7)W_(0.3)O_2 support approximately 20 wt. % of two synthesized methods. However, the diameter size and distribution of Pt nano-forms have clearly classified in two reduction route. For example, the Pt nanocatalyst, which was created by the rapid microwave-assisted polyol at 160 °C for 2 min, exhibited the good distribution on support with ~3 nm diameter. This could be ascribed to the fast and uniform heating of microwave-assisted and moderate reducing possibility of ethylene glycol. These results indicate that the rapid microwave-assisted polyol was an appropriate approach not only for synthesizing 20 wt. % Pt NPs/Ti_(0.7)W_(0.3)O_2 catalyst but also for preparing Pt-based electrocatalysts.