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Ultra-long Pt nanolawns supported on TiO2-coated carbon fibers as 3D hybrid catalyst for methanol oxidation.

Shen YL, Chen SY, Song JM, Chen IG - Nanoscale Res Lett (2012)

Bottom Line: In this study, TiO2 thin film photocatalyst on carbon fibers was used to synthesize ultra-long single crystalline Pt nanowires via a simple photoreduction route (thermally activated photoreduction).It also acted as a co-catalytic material with Pt.The electrochemical results indicate that TiO2 is capable of transforming CO-like poisoning species on the Pt surface during methanol oxidation and contributes to a high CO tolerance of this Pt nanowire/TiO2 hybrid structure.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Materials Science and Engineering, National Chung Hsing University, Taichung, 402, Taiwan. samsong@nchu.edu.tw.

ABSTRACT
In this study, TiO2 thin film photocatalyst on carbon fibers was used to synthesize ultra-long single crystalline Pt nanowires via a simple photoreduction route (thermally activated photoreduction). It also acted as a co-catalytic material with Pt. Taking advantage of the high-aspect ratio of the Pt nanostructure as well as the excellent catalytic activity of TiO2, this hybrid structure has the great potential as the active anode in direct methanol fuel cells. The electrochemical results indicate that TiO2 is capable of transforming CO-like poisoning species on the Pt surface during methanol oxidation and contributes to a high CO tolerance of this Pt nanowire/TiO2 hybrid structure.

No MeSH data available.


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Schematic illustration of the main steps for forming Pt nanowires by thermally assisted photoreduction.
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Figure 1: Schematic illustration of the main steps for forming Pt nanowires by thermally assisted photoreduction.

Mentions: The whole route for the synthesis of Pt NWs was illustrated in Figure 1. To make gel coating TiO2 films, the carbon fibers sheet in the size of 1 × 1 cm was dipped into the TiO2 solution. The carbon fiber sheets used were with a thickness of 360 μm and basis weight of 125 g/m2. After dipping, the weight gain per sample by absorption of TiO2 solution was 0.035 g. The dipped samples were then annealed at 500°C for 8 h in an oxygen atmosphere to obtain well crystallized anatase TiO2 (step 1 in Figure 1). The TiO2 solution used was prepared with isopropylalcohol (IPA)/titanium isopropoxide (TTIP)/hydrogen chloride (HCl) with the volume ratio 170:12:0.4 and stirred for 10 min at room temperature (20°C) before aging for 2 days. The weight of TiO2 on a 1 cm2 carbon fiber sample after annealing was measured to be 0.012 g (3.1 × 10−3 cm3 in volume). Fifteen microliters of 0.05 M Na2Pt(OH)6 aqueous salt solution was dropped on the TiO2 coated substrates (step 2). Afterward, the samples were isothermally heated at 300°C for 3 h in air by an infrared furnace, followed by a furnace-cooling to the ambient temperature (namely, the post thermal treatment, step 3 in Figure 1).


Ultra-long Pt nanolawns supported on TiO2-coated carbon fibers as 3D hybrid catalyst for methanol oxidation.

Shen YL, Chen SY, Song JM, Chen IG - Nanoscale Res Lett (2012)

Schematic illustration of the main steps for forming Pt nanowires by thermally assisted photoreduction.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3383480&req=5

Figure 1: Schematic illustration of the main steps for forming Pt nanowires by thermally assisted photoreduction.
Mentions: The whole route for the synthesis of Pt NWs was illustrated in Figure 1. To make gel coating TiO2 films, the carbon fibers sheet in the size of 1 × 1 cm was dipped into the TiO2 solution. The carbon fiber sheets used were with a thickness of 360 μm and basis weight of 125 g/m2. After dipping, the weight gain per sample by absorption of TiO2 solution was 0.035 g. The dipped samples were then annealed at 500°C for 8 h in an oxygen atmosphere to obtain well crystallized anatase TiO2 (step 1 in Figure 1). The TiO2 solution used was prepared with isopropylalcohol (IPA)/titanium isopropoxide (TTIP)/hydrogen chloride (HCl) with the volume ratio 170:12:0.4 and stirred for 10 min at room temperature (20°C) before aging for 2 days. The weight of TiO2 on a 1 cm2 carbon fiber sample after annealing was measured to be 0.012 g (3.1 × 10−3 cm3 in volume). Fifteen microliters of 0.05 M Na2Pt(OH)6 aqueous salt solution was dropped on the TiO2 coated substrates (step 2). Afterward, the samples were isothermally heated at 300°C for 3 h in air by an infrared furnace, followed by a furnace-cooling to the ambient temperature (namely, the post thermal treatment, step 3 in Figure 1).

Bottom Line: In this study, TiO2 thin film photocatalyst on carbon fibers was used to synthesize ultra-long single crystalline Pt nanowires via a simple photoreduction route (thermally activated photoreduction).It also acted as a co-catalytic material with Pt.The electrochemical results indicate that TiO2 is capable of transforming CO-like poisoning species on the Pt surface during methanol oxidation and contributes to a high CO tolerance of this Pt nanowire/TiO2 hybrid structure.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Materials Science and Engineering, National Chung Hsing University, Taichung, 402, Taiwan. samsong@nchu.edu.tw.

ABSTRACT
In this study, TiO2 thin film photocatalyst on carbon fibers was used to synthesize ultra-long single crystalline Pt nanowires via a simple photoreduction route (thermally activated photoreduction). It also acted as a co-catalytic material with Pt. Taking advantage of the high-aspect ratio of the Pt nanostructure as well as the excellent catalytic activity of TiO2, this hybrid structure has the great potential as the active anode in direct methanol fuel cells. The electrochemical results indicate that TiO2 is capable of transforming CO-like poisoning species on the Pt surface during methanol oxidation and contributes to a high CO tolerance of this Pt nanowire/TiO2 hybrid structure.

No MeSH data available.


Related in: MedlinePlus