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Preparation method of carbon-supported nano-palladium catalyst for electrochemical oxidation of methanol

A nano-palladium, electrochemical technology, applied in the direction of circuits, electrical components, battery electrodes, etc., can solve the problems of resource scarcity, direct methanol fuel cells that are difficult to commercialize, and expensive

Inactive Publication Date: 2019-11-19
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, limited by the high price and scarcity of traditional Pt catalysts, direct methanol fuel cells are difficult to achieve large-scale commercial applications.

Method used

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  • Preparation method of carbon-supported nano-palladium catalyst for electrochemical oxidation of methanol
  • Preparation method of carbon-supported nano-palladium catalyst for electrochemical oxidation of methanol
  • Preparation method of carbon-supported nano-palladium catalyst for electrochemical oxidation of methanol

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0021] Embodiment 1: In the third step of the preparation process, the amount of KOH solution is 3.4ml; other preparation conditions remain unchanged. The TEM picture of the obtained catalyst is as figure 1 shown. figure 1 It was shown that palladium nanoparticles were successfully supported on the surface of the 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 -0.05V. At this potential, the current density of the electrochemical oxidation of methanol is 72.6mA·mg -1 catalyst.

Embodiment approach 2

[0022] Embodiment 2: In the third step of the preparation process, the amount of KOH solution is 4.4ml; other preparation conditions remain unchanged. The TEM picture of the obtained catalyst is as image 3 shown. image 3 It was shown that palladium nanoparticles were successfully supported on the surface of the 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 -0.06V. At this potential, the current density of the electrochemical oxidation of methanol is 85.02mA·mg -1 catalyst.

Embodiment approach 3

[0023] Embodiment 3: In the third step of the preparation process, the amount of KOH solution is 5.4ml; other preparation conditions remain unchanged. The TEM picture of the obtained catalyst is as Figure 5 shown. Figure 5 It was shown that palladium nanoparticles were successfully supported on the surface of the activated carbon support. Figure 6 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 6 It can be seen that the peak electrode potential of the current density of the electrochemical oxidation of methanol on the catalyst surface is -0.05V. At this potential, the current density of the electrochemical oxidation of methanol is 85.39mA·mg -1 catalyst.

[0024] Embodiment 4: In the third step of the preparation process, the amount of KOH solution is 6.4ml; other preparation conditions remain unchanged. The TEM picture of the obtained catalyst...

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Abstract

The invention discloses a preparation method of a carbon-supported nano-palladium catalyst for electrochemical oxidation of methanol. The method comprises the following steps of: sequentially adding activated carbon and a PdCl2 aqueous solution into ethylene glycol, adding a KOH aqueous solution to regulate the reaction system to be alkaline, and preparing a carbon-supported nano-palladium catalyst at a temperature of 180 DEG C by using a stainless steel reaction kettle lined with polytetrafluoroethylene. The morphology of palladium nanoparticles in the carbon-supported nano-palladium catalystis characterized by a transmission electron microscope. The electrochemical methanol oxidation activity of the carbon-supported nano-palladium catalyst is evaluated by using cyclic voltammetry.

Description

technical field [0001] The invention relates to a preparation method of a carbon-supported nano-palladium catalyst for methanol electrochemical oxidation, and belongs to the technical field of fuel cell materials and the technical field of 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 commercia...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/92
CPCH01M4/926H01M4/88Y02E60/50
Inventor 卢利权王菁郭拉凤
Owner ZHONGBEI UNIV
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