Comparison the Rapid Microwave-Assisted Polyol Route and Modified Chemical Reduction Methods to Synthesize the Pt Nanoparticles on the Ti_0.7W_0.3O₂ Support

Abstract:

The tungsten-modified titanium dioxide, which prepared through the one-pot solvothermal process, exhibited the large specific surface area (~ 202 m²/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_0.7W_0.3O₂ catalyst, the modified chemical reduction utilizing NaBH₄ 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_0.7W_0.3O₂ support approximately 20 wt. % of two synthesized methods. However, the diameter size and distribution of Pt nanoforms 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_0.7W_0.3O₂ catalyst but also for preparing Pt-based electrocatalysts.

• Periodical: Solid State Phenomena (Volume 279)
• Pages: 181-186
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.279.181
• Online since: August 2018
• Authors: Hau Quoc Pham, Tai Thien Huynh, At Van Nguyen, Anh Tram Ngoc Mai, Vi Thuy Thi Phan, Long Giang Bach, Trinh Duy Nguyen, Van Thi Thanh Ho*
• Keywords: Modified Chemical Reduction, Rapid Microwave-Assisted Polyol, Solvothermal Process, Ti_0.7W_0.3O₂, W-Doped TiO₂

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