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Electro-synthesis of novel nanostructured PEDOT films and their application as catalyst support.

Zhou C, Liu Z, Yan Y, Du X, Mai YW, Ringer S - Nanoscale Res Lett (2011)

Bottom Line: The results indicate that the hierarchical structured PEDOT film doped with nitric ions displays a 'lunar craters' porous morphology consisting of PEDOT nano-sheets with a thickness of less than 2 nm.The effect of counter ions on the electro-polymerization, the electrochemistry, and the morphology of the polymer film was studied.Compared with PEDOT film doped with nitric acid, PEDOT film deposited in the presence of chlorine ions shows irregular morphology and less electrochemical activity.

View Article: PubMed Central - HTML - PubMed

Affiliation: Australian Centre for Microscopy and Microanalysis, University of Sydney, Sydney, NSW 2006, Australia. zongwen.liu@sydney.edu.au.

ABSTRACT
Poly(3,4-ethylenedioxythiophene) (PEDOT) films doped with nitric and chlorine ions have been electrochemically deposited simply by a one-step electrochemical method in an aqueous media in the absence of any surfactant. The fabricated PEDOT films were characterized by scanning electron microscopy, transmission electron microscopy, and Raman spectroscopy. The results indicate that the hierarchical structured PEDOT film doped with nitric ions displays a 'lunar craters' porous morphology consisting of PEDOT nano-sheets with a thickness of less than 2 nm. The effect of counter ions on the electro-polymerization, the electrochemistry, and the morphology of the polymer film was studied. Compared with PEDOT film doped with nitric acid, PEDOT film deposited in the presence of chlorine ions shows irregular morphology and less electrochemical activity. The specific nanostructure of the polymer was further studied as catalyst support for platinum nanoparticles to methanol electro-oxidation.

No MeSH data available.


Related in: MedlinePlus

Cyclic voltammograms of (a) Pt-PEDOT/GC and (c) Pt disk electrode in 1 M CH3OH + 0.5 M H2SO4, and (b) Pt-PEDOT/GC in 0.5 M H2SO4 . Scan rate: 100 mV/s.
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Figure 7: Cyclic voltammograms of (a) Pt-PEDOT/GC and (c) Pt disk electrode in 1 M CH3OH + 0.5 M H2SO4, and (b) Pt-PEDOT/GC in 0.5 M H2SO4 . Scan rate: 100 mV/s.

Mentions: The cyclic voltammogram of a Pt-PEDOT/GC electrode in 0.5 M H2SO4 at a sweep rate of 100 mV/s is shown in curve b in Figure 7. The current peaks appearing between -0.2 and 0.0 V are due to adsorption and desorption of hydrogen atoms on the Pt surface. The CV is similar to those of Pt metal [7], suggesting that Pt-PEDOT film is electrochemically active. The curve a in Figure 7 illustrates the electrocatalytic activity of the Pt-PEDOT/GC electrode toward oxidation of methanol. Comparing with the curve b, two new peaks appeared above 0.15 V in curve a in Figure 7, in which the forward current peak is attributed to the oxidation of CH3OH molecule and the backward current peak to the oxidation of adsorbed intermediates. The current peaks related to hydrogen adsorption in curve a in Figure 7 are much less than the ones in curve b, indicating the adsorption of some reaction intermediates from the oxidation of methanol on the Pt nano-catalysts. Obviously, the methanol oxidation current on the Pt-PEDOT catalyst (curve b) has been enhanced by more than 70 times than that of Pt electrode (curve c), exhibiting the advantage of the application of nanostructured PEDOT catalyst support and Pt nanocatalyst. The higher current for the methanol oxidation on Pt-PEDOT catalyst indicates their higher electrocatalystic activity of the novel catalysts, which is believed to be related to their porous nanostructure and high electroactivity.


Electro-synthesis of novel nanostructured PEDOT films and their application as catalyst support.

Zhou C, Liu Z, Yan Y, Du X, Mai YW, Ringer S - Nanoscale Res Lett (2011)

Cyclic voltammograms of (a) Pt-PEDOT/GC and (c) Pt disk electrode in 1 M CH3OH + 0.5 M H2SO4, and (b) Pt-PEDOT/GC in 0.5 M H2SO4 . Scan rate: 100 mV/s.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211454&req=5

Figure 7: Cyclic voltammograms of (a) Pt-PEDOT/GC and (c) Pt disk electrode in 1 M CH3OH + 0.5 M H2SO4, and (b) Pt-PEDOT/GC in 0.5 M H2SO4 . Scan rate: 100 mV/s.
Mentions: The cyclic voltammogram of a Pt-PEDOT/GC electrode in 0.5 M H2SO4 at a sweep rate of 100 mV/s is shown in curve b in Figure 7. The current peaks appearing between -0.2 and 0.0 V are due to adsorption and desorption of hydrogen atoms on the Pt surface. The CV is similar to those of Pt metal [7], suggesting that Pt-PEDOT film is electrochemically active. The curve a in Figure 7 illustrates the electrocatalytic activity of the Pt-PEDOT/GC electrode toward oxidation of methanol. Comparing with the curve b, two new peaks appeared above 0.15 V in curve a in Figure 7, in which the forward current peak is attributed to the oxidation of CH3OH molecule and the backward current peak to the oxidation of adsorbed intermediates. The current peaks related to hydrogen adsorption in curve a in Figure 7 are much less than the ones in curve b, indicating the adsorption of some reaction intermediates from the oxidation of methanol on the Pt nano-catalysts. Obviously, the methanol oxidation current on the Pt-PEDOT catalyst (curve b) has been enhanced by more than 70 times than that of Pt electrode (curve c), exhibiting the advantage of the application of nanostructured PEDOT catalyst support and Pt nanocatalyst. The higher current for the methanol oxidation on Pt-PEDOT catalyst indicates their higher electrocatalystic activity of the novel catalysts, which is believed to be related to their porous nanostructure and high electroactivity.

Bottom Line: The results indicate that the hierarchical structured PEDOT film doped with nitric ions displays a 'lunar craters' porous morphology consisting of PEDOT nano-sheets with a thickness of less than 2 nm.The effect of counter ions on the electro-polymerization, the electrochemistry, and the morphology of the polymer film was studied.Compared with PEDOT film doped with nitric acid, PEDOT film deposited in the presence of chlorine ions shows irregular morphology and less electrochemical activity.

View Article: PubMed Central - HTML - PubMed

Affiliation: Australian Centre for Microscopy and Microanalysis, University of Sydney, Sydney, NSW 2006, Australia. zongwen.liu@sydney.edu.au.

ABSTRACT
Poly(3,4-ethylenedioxythiophene) (PEDOT) films doped with nitric and chlorine ions have been electrochemically deposited simply by a one-step electrochemical method in an aqueous media in the absence of any surfactant. The fabricated PEDOT films were characterized by scanning electron microscopy, transmission electron microscopy, and Raman spectroscopy. The results indicate that the hierarchical structured PEDOT film doped with nitric ions displays a 'lunar craters' porous morphology consisting of PEDOT nano-sheets with a thickness of less than 2 nm. The effect of counter ions on the electro-polymerization, the electrochemistry, and the morphology of the polymer film was studied. Compared with PEDOT film doped with nitric acid, PEDOT film deposited in the presence of chlorine ions shows irregular morphology and less electrochemical activity. The specific nanostructure of the polymer was further studied as catalyst support for platinum nanoparticles to methanol electro-oxidation.

No MeSH data available.


Related in: MedlinePlus