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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-Pt 8 and NPG-Pt 64 samples in a mixed solution of 0.1 M NaOH + 10 mM glucose, scan rate: 50 mV s-1. Pure Pt electrode was included for comparison and the currents were normalized to the geometrical areas.
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Figure 6: CV curves for NPG-Pt 8 and NPG-Pt 64 samples in a mixed solution of 0.1 M NaOH + 10 mM glucose, scan rate: 50 mV s-1. Pure Pt electrode was included for comparison and the currents were normalized to the geometrical areas.

Mentions: Figure 6 shows the CV curves of NPG-Pt in the mixed solution of NaOH and 10 mM glucose. As in PBS, three oxidation peaks were observed in the positive scan, indicating a similar reaction process. Nevertheless, the observed high current densities as compared to that in PBS suggest that glucose oxidation in alkaline solution proceeds more rapidly than in neutral solution, due to the high concentration of OH- ions which are believed to be directly involved in the reaction intermediates oxidation [6]. This is also in agreement with previous observation that Pt-decorated NPG could exhibit high activity and good stability for methanol oxidation in alkaline solution [21]. Again, the NPG-Pt 64 sample exhibits the highest activity, with a peak current density approximately 1.5 and 3.4 mA cm-2 for peaks A1 and A2, respectively, which are about seven times higher than those on pure Pt electrode.


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-Pt 8 and NPG-Pt 64 samples in a mixed solution of 0.1 M NaOH + 10 mM glucose, scan rate: 50 mV s-1. Pure Pt electrode was included for comparison and 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 6: CV curves for NPG-Pt 8 and NPG-Pt 64 samples in a mixed solution of 0.1 M NaOH + 10 mM glucose, scan rate: 50 mV s-1. Pure Pt electrode was included for comparison and the currents were normalized to the geometrical areas.
Mentions: Figure 6 shows the CV curves of NPG-Pt in the mixed solution of NaOH and 10 mM glucose. As in PBS, three oxidation peaks were observed in the positive scan, indicating a similar reaction process. Nevertheless, the observed high current densities as compared to that in PBS suggest that glucose oxidation in alkaline solution proceeds more rapidly than in neutral solution, due to the high concentration of OH- ions which are believed to be directly involved in the reaction intermediates oxidation [6]. This is also in agreement with previous observation that Pt-decorated NPG could exhibit high activity and good stability for methanol oxidation in alkaline solution [21]. Again, the NPG-Pt 64 sample exhibits the highest activity, with a peak current density approximately 1.5 and 3.4 mA cm-2 for peaks A1 and A2, respectively, which are about seven times higher than those on pure Pt electrode.

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