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Preparation method of charcoal-supported palladium-silver nanometer composite catalyst for direct methanol fuel cells

A methanol fuel cell and nanocomposite technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as weakened catalytic activity

Inactive Publication Date: 2015-09-09
ZHONGBEI UNIV
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  • Claims
  • Application Information

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Problems solved by technology

However, similar to the Pt catalyst, the adsorption of CO-like intermediates generated during the electrochemical oxidation of methanol on the surface of the Pd catalyst also leads to a gradual weakening of its catalytic activity.

Method used

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  • Preparation method of charcoal-supported palladium-silver nanometer composite catalyst for direct methanol fuel cells
  • Preparation method of charcoal-supported palladium-silver nanometer composite catalyst for direct methanol fuel cells
  • Preparation method of charcoal-supported palladium-silver nanometer composite catalyst for direct methanol fuel cells

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Experimental program
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Embodiment approach 1

[0019] Embodiment one: in the 4th step of preparation process, NaBH 4 The dosage is 128 mg; other preparation conditions remain unchanged. The TEM picture of the obtained catalyst is as figure 1 shown. figure 1 It was shown that palladium silver nanoparticles were successfully loaded on the surface of activated carbon support. figure 2 is the resulting catalyst in 0.1M KOH+1M CH 3 CV curves in OH mixed solution. The current density of the CV curves was normalized by the mass of the catalyst. from figure 2 It can be seen that the peak electrode potential of the current density of the electrochemical oxidation of methanol on the catalyst surface is -0.15V. At this potential, the current density of the electrochemical oxidation of methanol is 0.71mA·mg -1 catalyst. Additionally, from figure 2 It can be found that no poisoning peak of methanol oxidation intermediates appears during cathodic polarization. The results show that the catalyst has good resistance to methan...

Embodiment approach 2

[0020] Embodiment two: in the 4th step of preparation process, NaBH 4 The dosage is 256 mg; other preparation conditions remain unchanged. The TEM picture of the obtained catalyst is as image 3 shown. image 3 It was shown that palladium silver nanoparticles were successfully loaded on the surface of activated carbon support. Figure 4 is the resulting catalyst in 0.1M KOH+1M CH 3 CV curves in OH mixed solution. The current density of the CV curves was normalized by the mass of the catalyst. from Figure 4 It can be seen that the peak electrode potential of the current density of the electrochemical oxidation of methanol on the catalyst surface is -0.15V. At this potential, the current density of the electrochemical oxidation of methanol is 3.56mA·mg -1 catalyst. Although in the cathodic polarization process, the CV curve of the catalyst showed a current density of 1.64mA·mg at -0.33V -1 Catalyst poisoning peak. But the ratio of current density between the current p...

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Abstract

The present invention discloses a preparation method of a charcoal-supported palladium-silver nanometer composite catalyst for direct methanol fuel cells. The method comprises: in the presence of polyvinylpyrrolidone, adding a NaOH aqueous solution to adjust the pH value of the reaction system, and using NaBH4 as a reducing agent to prepare the charcoal-supported palladium-silver nanometer composite catalyst. According to the present invention, the morphology of the palladium-silver nanoparticles in the charcoal-supported palladium-silver nanometer composite catalyst is characterized through TEM, and the methanol electrochemical oxidation activity of the charcoal-supported palladium-silver nanometer composite catalyst is evaluated by using the cyclic voltammetry method.

Description

technical field [0001] The invention relates to a method for preparing a carbon-supported palladium-silver nanocomposite catalyst for direct methanol fuel cells, belonging to the technical fields of fuel cell materials and electrocatalysts. Background technique [0002] Because methanol fuel has the advantages of high energy density, high energy efficiency, and easy transportation and storage, direct methanol fuel cells have broad potential applications in portable power devices and electric vehicles. The anode reaction of direct methanol fuel cells is the electrochemical oxidation of methanol, which is a complex reaction involving the transfer of six electrons. At present, the Pt catalyst with the best catalytic activity for the electrochemical oxidation of methanol is still one of the main research objects. However, limited by the high price and scarcity of traditional Pt catalysts, direct methanol fuel cells are difficult to achieve large-scale commercial applications. ...

Claims

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Application Information

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IPC IPC(8): B01J23/50H01M4/92
CPCY02E60/50
Inventor 卢利权徐光宇李彩霞闫少辉高利珍张卫珂吴绮昀
Owner ZHONGBEI UNIV
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