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Pt-decorated nanoporous gold for glucose electrooxidation in neutral and alkaline solutions.

Yan X, Ge X, Cui S - Nanoscale Res Lett (2011)

Bottom Line: Pt-decorated nanoporous gold (NPG-Pt), created by depositing a thin layer of Pt on NPG surface, was proposed as an active electrode for glucose electrooxidation in neutral and alkaline solutions.The electrocatalytic activity toward glucose oxidation in neutral and alkaline solutions was evaluated, which was found to depend strongly on the surface structure of NPG-Pt.A direct glucose fuel cell (DGFC) was performed based on the novel membrane electrode materials.

View Article: PubMed Central - HTML - PubMed

Affiliation: School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China. xiuling1212@gmail.com.

ABSTRACT
Exploiting electrocatalysts with high activity for glucose oxidation is of central importance for practical applications such as glucose fuel cell. Pt-decorated nanoporous gold (NPG-Pt), created by depositing a thin layer of Pt on NPG surface, was proposed as an active electrode for glucose electrooxidation in neutral and alkaline solutions. The structure and surface properties of NPG-Pt were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD), and cyclic voltammetry (CV). The electrocatalytic activity toward glucose oxidation in neutral and alkaline solutions was evaluated, which was found to depend strongly on the surface structure of NPG-Pt. A direct glucose fuel cell (DGFC) was performed based on the novel membrane electrode materials. With a low precious metal load of less than 0.3 mg cm-2 Au and 60 μg cm-2 Pt in anode and commercial Pt/C in cathode, the performance of DGFC in alkaline is much better than that in neutral condition.

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CV curves for NPG and NPG-Pt 8, NPG-Pt 64 samples in 0.1 M PBS, scan rate: 50 mV s-1. The currents were normalized to the geometrical areas.
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Figure 3: CV curves for NPG and NPG-Pt 8, NPG-Pt 64 samples in 0.1 M PBS, scan rate: 50 mV s-1. The currents were normalized to the geometrical areas.

Mentions: The NPG-Pt electrodes were further characterized by means of CV in 0.1 M PBS, as shown in Figure 3, where NPG was also included for comparison. The fresh NPG exhibits an obvious anodic current rise at approximately 0.4 V and a sharp cathodic peak at approximately 0.05 V for Au surface oxides formation and reduction, respectively, similar to the reported polycrystalline Au electrode in PBS [27]. After plating, it could be observed that the well-defined hydrogen adsorption/desorption peaks in the potential region between ~ -1.0 and -0.7 V show up and gradually increase in intensity with the plating time. The Pt surface oxides formation begins at approximately 0.2 V and the corresponding oxides reduction peaks appear at approximately -0.42 V. Meanwhile, the signals for gold surface oxides formation and reduction nearly disappear in the entire potential range, indicating a near complete coverage by the deposited Pt. These electrochemical characteristics of NPG-Pt are in good agreement with previous observations in acid solutions [22].


Pt-decorated nanoporous gold for glucose electrooxidation in neutral and alkaline solutions.

Yan X, Ge X, Cui S - Nanoscale Res Lett (2011)

CV curves for NPG and NPG-Pt 8, NPG-Pt 64 samples in 0.1 M PBS, scan rate: 50 mV s-1. The currents were normalized to the geometrical areas.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211400&req=5

Figure 3: CV curves for NPG and NPG-Pt 8, NPG-Pt 64 samples in 0.1 M PBS, scan rate: 50 mV s-1. The currents were normalized to the geometrical areas.
Mentions: The NPG-Pt electrodes were further characterized by means of CV in 0.1 M PBS, as shown in Figure 3, where NPG was also included for comparison. The fresh NPG exhibits an obvious anodic current rise at approximately 0.4 V and a sharp cathodic peak at approximately 0.05 V for Au surface oxides formation and reduction, respectively, similar to the reported polycrystalline Au electrode in PBS [27]. After plating, it could be observed that the well-defined hydrogen adsorption/desorption peaks in the potential region between ~ -1.0 and -0.7 V show up and gradually increase in intensity with the plating time. The Pt surface oxides formation begins at approximately 0.2 V and the corresponding oxides reduction peaks appear at approximately -0.42 V. Meanwhile, the signals for gold surface oxides formation and reduction nearly disappear in the entire potential range, indicating a near complete coverage by the deposited Pt. These electrochemical characteristics of NPG-Pt are in good agreement with previous observations in acid solutions [22].

Bottom Line: Pt-decorated nanoporous gold (NPG-Pt), created by depositing a thin layer of Pt on NPG surface, was proposed as an active electrode for glucose electrooxidation in neutral and alkaline solutions.The electrocatalytic activity toward glucose oxidation in neutral and alkaline solutions was evaluated, which was found to depend strongly on the surface structure of NPG-Pt.A direct glucose fuel cell (DGFC) was performed based on the novel membrane electrode materials.

View Article: PubMed Central - HTML - PubMed

Affiliation: School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China. xiuling1212@gmail.com.

ABSTRACT
Exploiting electrocatalysts with high activity for glucose oxidation is of central importance for practical applications such as glucose fuel cell. Pt-decorated nanoporous gold (NPG-Pt), created by depositing a thin layer of Pt on NPG surface, was proposed as an active electrode for glucose electrooxidation in neutral and alkaline solutions. The structure and surface properties of NPG-Pt were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD), and cyclic voltammetry (CV). The electrocatalytic activity toward glucose oxidation in neutral and alkaline solutions was evaluated, which was found to depend strongly on the surface structure of NPG-Pt. A direct glucose fuel cell (DGFC) was performed based on the novel membrane electrode materials. With a low precious metal load of less than 0.3 mg cm-2 Au and 60 μg cm-2 Pt in anode and commercial Pt/C in cathode, the performance of DGFC in alkaline is much better than that in neutral condition.

No MeSH data available.


Related in: MedlinePlus