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Fabrication of cubic PtCu nanocages and their enhanced electrocatalytic activity towards hydrogen peroxide.

Tian L, Zhong X, Hu W, Liu B, Li Y - Nanoscale Res Lett (2014)

Bottom Line: Cubic PtCu nanocages (NCs) were successfully synthesized through a redox reaction using cuprous oxide (Cu2O) as a sacrificial template and reducing agent.The porous PtCu NCs were composed of amounts of PtCu nanograins with an average particle size of 2.9 nm.The hollow porous nanostructure has potential applications in biosensors.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Research Center for Materials Interdisciplinary Science, Chongqing University of Arts and Sciences, Chongqing 402160, China. liubitao007@163.com.

ABSTRACT
Cubic PtCu nanocages (NCs) were successfully synthesized through a redox reaction using cuprous oxide (Cu2O) as a sacrificial template and reducing agent. The porous PtCu NCs were composed of amounts of PtCu nanograins with an average particle size of 2.9 nm. The electrocatalytic performance of the PtCu NC electrode towards H2O2 was studied by cyclic voltammetry (CV) and chronoamperometry. The prepared PtCu NC electrode exhibited excellent electrocatalytic activity towards H2O2, with a wide liner range from 5 μM to 22.25 mM, a relatively high sensitivity of 295.3 μA mM-1 cm-2, and a low detection limit of 5 μM (S/N = 3). The hollow porous nanostructure has potential applications in biosensors.

No MeSH data available.


Current-time response of PtCu NC electrode towards H2O2. The inset shows the relationship between the catalytic current and the concentration of H2O2.
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Figure 3: Current-time response of PtCu NC electrode towards H2O2. The inset shows the relationship between the catalytic current and the concentration of H2O2.

Mentions: Figure 3 displays the amperometric response of the cubic PtCu NC electrode at -0.45 V to successive injection of a certain amount of H2O2 into the stirred 0.1 M PBS, and the corresponding calibration curve is exhibited in the inset. After the injection of H2O2 into the 0.1 M PBS, a well-defined, stable, and fast amperometric response was observed. The linear relationship was obtained for concentration ranging from 5 μM to 22.25 mM. The linear regression equation was given as y = -20.862x - 32.157 [I (μA); x (mM)], with a correlation coefficient of R = 0.9990. The detection limit of H2O2 was found to be 5 μM (S/N = 3) with a relatively high sensitivity of 295.3 μA mM-1 cm-2. The sensitivity and linear range obtained at PtCu NC electrode are better than those for HRP immobilized at multiwalled carbon nanotube/alumina-coated silica nanocomposite modified glassy carbon electrode (157 μA mM-1 cm-2; 1 to 500 μM) [13] and nano-Au monolayer supported by carbon ceramic electrode (290 μA mM-1 cm-2; 12.2 μM to 1.1 mM) [14]. The excellent performance may be attributed to the possible synergetic effect between Pt and Cu [15] and the porous structure of the PtCu NCs, which provide a large specific surface area. In terms of the synergetic effect, Cu atom in the PtCu alloy acts both as promoting centers for the generation of the Cu-OHad species and as an electron donor to Pt in the PtCu alloy. The incorporation of Cu atom decreases the Pt 4f binding energies and consequently reduces the Pt-OHad bond strength. Therefore, the intimate contact between Pt and Cu domains in the PtCu alloy greatly promotes the regeneration of Pt sites for high electrochemical activity towards hydrogen peroxide.


Fabrication of cubic PtCu nanocages and their enhanced electrocatalytic activity towards hydrogen peroxide.

Tian L, Zhong X, Hu W, Liu B, Li Y - Nanoscale Res Lett (2014)

Current-time response of PtCu NC electrode towards H2O2. The inset shows the relationship between the catalytic current and the concentration of H2O2.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3924914&req=5

Figure 3: Current-time response of PtCu NC electrode towards H2O2. The inset shows the relationship between the catalytic current and the concentration of H2O2.
Mentions: Figure 3 displays the amperometric response of the cubic PtCu NC electrode at -0.45 V to successive injection of a certain amount of H2O2 into the stirred 0.1 M PBS, and the corresponding calibration curve is exhibited in the inset. After the injection of H2O2 into the 0.1 M PBS, a well-defined, stable, and fast amperometric response was observed. The linear relationship was obtained for concentration ranging from 5 μM to 22.25 mM. The linear regression equation was given as y = -20.862x - 32.157 [I (μA); x (mM)], with a correlation coefficient of R = 0.9990. The detection limit of H2O2 was found to be 5 μM (S/N = 3) with a relatively high sensitivity of 295.3 μA mM-1 cm-2. The sensitivity and linear range obtained at PtCu NC electrode are better than those for HRP immobilized at multiwalled carbon nanotube/alumina-coated silica nanocomposite modified glassy carbon electrode (157 μA mM-1 cm-2; 1 to 500 μM) [13] and nano-Au monolayer supported by carbon ceramic electrode (290 μA mM-1 cm-2; 12.2 μM to 1.1 mM) [14]. The excellent performance may be attributed to the possible synergetic effect between Pt and Cu [15] and the porous structure of the PtCu NCs, which provide a large specific surface area. In terms of the synergetic effect, Cu atom in the PtCu alloy acts both as promoting centers for the generation of the Cu-OHad species and as an electron donor to Pt in the PtCu alloy. The incorporation of Cu atom decreases the Pt 4f binding energies and consequently reduces the Pt-OHad bond strength. Therefore, the intimate contact between Pt and Cu domains in the PtCu alloy greatly promotes the regeneration of Pt sites for high electrochemical activity towards hydrogen peroxide.

Bottom Line: Cubic PtCu nanocages (NCs) were successfully synthesized through a redox reaction using cuprous oxide (Cu2O) as a sacrificial template and reducing agent.The porous PtCu NCs were composed of amounts of PtCu nanograins with an average particle size of 2.9 nm.The hollow porous nanostructure has potential applications in biosensors.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Research Center for Materials Interdisciplinary Science, Chongqing University of Arts and Sciences, Chongqing 402160, China. liubitao007@163.com.

ABSTRACT
Cubic PtCu nanocages (NCs) were successfully synthesized through a redox reaction using cuprous oxide (Cu2O) as a sacrificial template and reducing agent. The porous PtCu NCs were composed of amounts of PtCu nanograins with an average particle size of 2.9 nm. The electrocatalytic performance of the PtCu NC electrode towards H2O2 was studied by cyclic voltammetry (CV) and chronoamperometry. The prepared PtCu NC electrode exhibited excellent electrocatalytic activity towards H2O2, with a wide liner range from 5 μM to 22.25 mM, a relatively high sensitivity of 295.3 μA mM-1 cm-2, and a low detection limit of 5 μM (S/N = 3). The hollow porous nanostructure has potential applications in biosensors.

No MeSH data available.