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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 obtained for NPG-Pt 8 and NPG-Pt 64 samples in a mixed solution of 0.1 M PBS + 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 4: CV curves obtained for NPG-Pt 8 and NPG-Pt 64 samples in a mixed solution of 0.1 M PBS + 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: The electrocatalytic activity of NPG-Pt toward glucose oxidation was evaluated by CV in PBS containing 10 mM glucose, and a pure Pt electrode with smooth surface was also included for comparison. As shown in Figure 4, all three samples show similar voltammetric behavior in the presence of glucose, i.e., three main oxidation peaks (A1, A2, and A3) appear during the positive potential scan at -0.84, -0.3, and 0.2 V, respectively, similar to the glucose oxidation on Pt-rich Au-Pt alloy nanoparticles [4]. The peak A1 at the low potential region is often attributed to the dehydrogenation of glucose on active Pt surface, producing a layer of adsorbed glucose intermediates on electrode surface [8]. These intermediate species were then oxidized at a positive potential, resulting in peaks A2 and A3. Further increasing the potential, surface metal oxides generate which are nearly inactive for glucose oxidation, resulting in a current drop at higher potential. The peak A4 was ascribed to the glucose electroadsorption on the freshly produced active Pt surface at approximately -0.4 V during the negative scan. These voltammetric feathers are also similar to other reported Pt-based bimetallic electrode, reflecting a similar reaction process. Meanwhile, it is observed that NPG-Pt samples exhibits substantially higher peak current densities than Pt electrode, indicating a superior catalytic activity toward glucose oxidation. In addition, NPG-Pt 64 exhibits the highest activity among the three samples, due to the largest active surface area as revealed by CV in PBS in Figure 3. It is noted that NPG-Pt membrane can directly be used as an unsupported electrocatalyst in PEM fuel cells [24,25]; therefore, these unique nanostructures can be expected to function as active bimetallic anode catalysts in glucose fuel cells.


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

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

CV curves obtained for NPG-Pt 8 and NPG-Pt 64 samples in a mixed solution of 0.1 M PBS + 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 4: CV curves obtained for NPG-Pt 8 and NPG-Pt 64 samples in a mixed solution of 0.1 M PBS + 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: The electrocatalytic activity of NPG-Pt toward glucose oxidation was evaluated by CV in PBS containing 10 mM glucose, and a pure Pt electrode with smooth surface was also included for comparison. As shown in Figure 4, all three samples show similar voltammetric behavior in the presence of glucose, i.e., three main oxidation peaks (A1, A2, and A3) appear during the positive potential scan at -0.84, -0.3, and 0.2 V, respectively, similar to the glucose oxidation on Pt-rich Au-Pt alloy nanoparticles [4]. The peak A1 at the low potential region is often attributed to the dehydrogenation of glucose on active Pt surface, producing a layer of adsorbed glucose intermediates on electrode surface [8]. These intermediate species were then oxidized at a positive potential, resulting in peaks A2 and A3. Further increasing the potential, surface metal oxides generate which are nearly inactive for glucose oxidation, resulting in a current drop at higher potential. The peak A4 was ascribed to the glucose electroadsorption on the freshly produced active Pt surface at approximately -0.4 V during the negative scan. These voltammetric feathers are also similar to other reported Pt-based bimetallic electrode, reflecting a similar reaction process. Meanwhile, it is observed that NPG-Pt samples exhibits substantially higher peak current densities than Pt electrode, indicating a superior catalytic activity toward glucose oxidation. In addition, NPG-Pt 64 exhibits the highest activity among the three samples, due to the largest active surface area as revealed by CV in PBS in Figure 3. It is noted that NPG-Pt membrane can directly be used as an unsupported electrocatalyst in PEM fuel cells [24,25]; therefore, these unique nanostructures can be expected to function as active bimetallic anode catalysts in glucose fuel cells.

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