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/Ti0.7W0.3O2 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 Ti0.7W0.3O2 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/Ti0.7W0.3O2 catalyst but also for preparing Pt-based electrocatalysts.

Effect of Cobalt Composition on Electrochemical Behavior of Platinum-Based Catalyst towards Hydrogen Evolution Reaction

“…The agents were H2PtCl6.6H2O (~38% Pt, Sigma-Aldrich), CoCl2.6H2O (98%, Sigma-Aldrich), NaBH4 (98%, Sigma-Aldrich), and ethylene glycol (99.8%, Sigma-Aldrich). In a typical experiment, Co1-xPtx NPs (x = 0.25; 0.5; 0.75) alloys were deposited on the surface of carbon support by a modified chemical reduction reaction at room temperature by using a mixture of NaBH4 and EG [10,11]. Briefly, 0.05 M of H2PtCl6 and 0.05 M CoCl2 were added to a mixture (0.5 mL EG and 25 mL distilled water) with the different Pt: Co atomic ratios.…”