Palladium nanoparticles have been electrodeposited on the surfaces of conductive indium tin oxide (ITO) modified silicon internal reflection elements. The resulting films are shown to be excellent platforms for attenuated...
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.
Summary
Highly stable and cost‐effective electrocatalysts are of importance in regulating energy conversion efficiency and commercial feasibility of direct methanol fuel cells (DMFCs). So far, integrating transition metals into Pt‐based catalysts to enhance their catalytic performances for methanol electro‐oxidation reaction (MOR) at the anode of DMFCs has received significant interest. This study witnessed the first time of depositing Pt3Co1 alloy nanoparticles (NPs) on robust Ti0.9Ir0.1O2 supports utilizing a modified reduction method that used NaBH4 as a reducing agent in the absence of surfactants or stabilizers. This novel combination not only reduces the usage of costly and easily‐deactivated Pt but also significantly improves catalytic activity and poisoning tolerance for MOR. Regarding electrocatalytic performance, the onset potential and the mass activity of the Pt3Co1/Ti0.9Ir0.1O2 catalyst are ~0.1 V vs NHE and 316.16 mA/mgPt, respectively, which are 4.5‐fold lower and 1.5‐fold higher than the corresponding figures for the commercial Pt/C (E‐TEK) catalyst, ~0.45 vs NHE and 206.83 mA/mgPt, indicating superior catalytic activity and CO‐tolerance of the former over the latter. Furthermore, the superior anti‐poisoning ability and stability of the Pt3Co1/Ti0.9Ir0.1O2 catalyst are demonstrated by its 2.2‐fold higher If/Ib ratio in MOR and lower degradation rate in the 60‐min chronoamperometry (CA) and 3000‐cycle scanning tests than the Pt/C counterpart. These enhancements could be abscribed to synergistic influence between the Pt‐Co alloy NPs and the robust Ti0.9Ir0.1O2 support. The addition of Co into the catalyst to promote removal of Pt‐poisoning species as well as the use of highly corrosion‐resistant Ir‐doped TiO2 as a catalyst support play a decisive role in boosting electrochemical behaviors of the Pt3Co1/ Ti0.9Ir0.1O2 catalyst. Generally, the success of this work in synthesizing high‐performance Pt3Co1/Ti0.9Ir0.1O2 catalyst could serve as groundwork for further development of TiO2‐based material supported bimetallic catalysts for applications in the electrochemical catalysis field.
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