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One-pot synthesis of poly (3,4-ethylenedioxythiophene)-Pt nanoparticle composite and its application to electrochemical H2O2 sensor.

Chang LC, Wu HN, Lin CY, Lai YH, Hu CW, Ho KC - Nanoscale Res Lett (2012)

Bottom Line: The immobilized PtNPs showed excellent electrocatalytic activities towards the electroreduction of hydrogen peroxide.The resultant amperometric sensor showed enhanced sensitivity for the detection of H2O2 as compared to that without PtNPs, i.e., only with a layer of PEDOT.Sensing properties of the modified electrode were studied both by CV and amperometric analysis.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Chemical Engineering, National Taiwan University, Taipei, 10617, Taiwan. kcho@ntu.edu.tw.

ABSTRACT
Poly(3,4-ethylenedioxythiophene)-Pt nanoparticle composite was synthesized in one-pot fashion using a photo-assisted chemical method, and its electrocatalytic properties toward hydrogen peroxide (H2O2) was investigated. Under UV irradiation, the rates of the oxidative polymerization of EDOT monomer along with the reduction of Pt4+ ions were accelerated. In addition, the morphology of PtNPs was also greatly influenced by the UV irradiation; the size of PtNPs was reduced under UV irradiation, which can be attributed to the faster nucleation rate. The immobilized PtNPs showed excellent electrocatalytic activities towards the electroreduction of hydrogen peroxide. The resultant amperometric sensor showed enhanced sensitivity for the detection of H2O2 as compared to that without PtNPs, i.e., only with a layer of PEDOT. Amperometric determination of H2O2 at -0.55 V gave a limit of detection of 1.6 μM (S / N = 3) and a sensitivity of 19.29 mA cm-2 M-1 up to 6 mM, with a response time (steady state, t95) of 30 to 40 s. Energy dispersive X-ray analysis, transmission electron microscopic image, cyclic voltammetry (CV), and scanning electron microscopic images were utilized to characterize the modified electrode. Sensing properties of the modified electrode were studied both by CV and amperometric analysis.

No MeSH data available.


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Cyclic voltammetry. Cyclic voltammograms of the (a) bare SPC, (b) PEDOT/SPC, (c) PEDOT-PtNPs/SPC electrodes (one layer), (d) PEDOT-PtNPs/SPC electrodes (two layers), and (e) PEDOT-PtNPs/SPC electrodes (three layers) in 0.1 M phosphate buffer solution (pH 7.4) with and without adding 0.1 mM H2O2. Scan rate is 25 mV s−1.
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Figure 6: Cyclic voltammetry. Cyclic voltammograms of the (a) bare SPC, (b) PEDOT/SPC, (c) PEDOT-PtNPs/SPC electrodes (one layer), (d) PEDOT-PtNPs/SPC electrodes (two layers), and (e) PEDOT-PtNPs/SPC electrodes (three layers) in 0.1 M phosphate buffer solution (pH 7.4) with and without adding 0.1 mM H2O2. Scan rate is 25 mV s−1.

Mentions: The electrocatalytic behavior of the PEDOT-PtNPs/SPC electrode towards the electrochemical reduction of H2O2 was studied using cyclic voltammetry. Figure 6a,b,c shows the CV responses for the bare SPC, PEDOT/SPC, and PEDOT-PtNPs/SPC electrodes in deaerated 0.1 M phosphate buffer solution (PBS, pH 7.4) containing 0 and 0.1 mM of H2O2. In the blank phosphate buffer, no faradic current was detected for all electrodes. However, an obvious change in reduction current density was noticed after the addition of 0.1 mM of H2O2 in the case of the PEDOT-PtNPs/SPC electrode, while there were no obvious change in current density for the cases of bare SPC and PEDOT/SPC electrodes. It has been reported that the electroreduction of H2O2 on PtNPs involves a rate-limiting chemical step (Equation 1) followed by the electron transfer step (Equation 2) [34]:


One-pot synthesis of poly (3,4-ethylenedioxythiophene)-Pt nanoparticle composite and its application to electrochemical H2O2 sensor.

Chang LC, Wu HN, Lin CY, Lai YH, Hu CW, Ho KC - Nanoscale Res Lett (2012)

Cyclic voltammetry. Cyclic voltammograms of the (a) bare SPC, (b) PEDOT/SPC, (c) PEDOT-PtNPs/SPC electrodes (one layer), (d) PEDOT-PtNPs/SPC electrodes (two layers), and (e) PEDOT-PtNPs/SPC electrodes (three layers) in 0.1 M phosphate buffer solution (pH 7.4) with and without adding 0.1 mM H2O2. Scan rate is 25 mV s−1.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3475046&req=5

Figure 6: Cyclic voltammetry. Cyclic voltammograms of the (a) bare SPC, (b) PEDOT/SPC, (c) PEDOT-PtNPs/SPC electrodes (one layer), (d) PEDOT-PtNPs/SPC electrodes (two layers), and (e) PEDOT-PtNPs/SPC electrodes (three layers) in 0.1 M phosphate buffer solution (pH 7.4) with and without adding 0.1 mM H2O2. Scan rate is 25 mV s−1.
Mentions: The electrocatalytic behavior of the PEDOT-PtNPs/SPC electrode towards the electrochemical reduction of H2O2 was studied using cyclic voltammetry. Figure 6a,b,c shows the CV responses for the bare SPC, PEDOT/SPC, and PEDOT-PtNPs/SPC electrodes in deaerated 0.1 M phosphate buffer solution (PBS, pH 7.4) containing 0 and 0.1 mM of H2O2. In the blank phosphate buffer, no faradic current was detected for all electrodes. However, an obvious change in reduction current density was noticed after the addition of 0.1 mM of H2O2 in the case of the PEDOT-PtNPs/SPC electrode, while there were no obvious change in current density for the cases of bare SPC and PEDOT/SPC electrodes. It has been reported that the electroreduction of H2O2 on PtNPs involves a rate-limiting chemical step (Equation 1) followed by the electron transfer step (Equation 2) [34]:

Bottom Line: The immobilized PtNPs showed excellent electrocatalytic activities towards the electroreduction of hydrogen peroxide.The resultant amperometric sensor showed enhanced sensitivity for the detection of H2O2 as compared to that without PtNPs, i.e., only with a layer of PEDOT.Sensing properties of the modified electrode were studied both by CV and amperometric analysis.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Chemical Engineering, National Taiwan University, Taipei, 10617, Taiwan. kcho@ntu.edu.tw.

ABSTRACT
Poly(3,4-ethylenedioxythiophene)-Pt nanoparticle composite was synthesized in one-pot fashion using a photo-assisted chemical method, and its electrocatalytic properties toward hydrogen peroxide (H2O2) was investigated. Under UV irradiation, the rates of the oxidative polymerization of EDOT monomer along with the reduction of Pt4+ ions were accelerated. In addition, the morphology of PtNPs was also greatly influenced by the UV irradiation; the size of PtNPs was reduced under UV irradiation, which can be attributed to the faster nucleation rate. The immobilized PtNPs showed excellent electrocatalytic activities towards the electroreduction of hydrogen peroxide. The resultant amperometric sensor showed enhanced sensitivity for the detection of H2O2 as compared to that without PtNPs, i.e., only with a layer of PEDOT. Amperometric determination of H2O2 at -0.55 V gave a limit of detection of 1.6 μM (S / N = 3) and a sensitivity of 19.29 mA cm-2 M-1 up to 6 mM, with a response time (steady state, t95) of 30 to 40 s. Energy dispersive X-ray analysis, transmission electron microscopic image, cyclic voltammetry (CV), and scanning electron microscopic images were utilized to characterize the modified electrode. Sensing properties of the modified electrode were studied both by CV and amperometric analysis.

No MeSH data available.


Related in: MedlinePlus