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Low-platinum carbon-supported nanometer Pd-Pt alloy catalyst, and preparation method and application thereof

A technology of alloy catalyst and platinum carbon, which is applied in the field of electrochemical energy, can solve the problems of low activity, low utilization rate of precious metals, and poor catalytic stability, and achieve good dispersion, improved catalyst performance, and long-lasting catalytic stability.

Inactive Publication Date: 2009-12-30
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to provide a low-platinum carbon-supported nano-Pd-Pt alloy catalyst, which solves the problems of low activity of existing Pd and Pt catalysts, low utilization of noble metals, poor catalytic stability, etc., and can be used in direct formic acid fuel cells. It has high reactivity and high stability in the anode catalytic process, and can obtain higher oxidation current at lower oxidation potential

Method used

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  • Low-platinum carbon-supported nanometer Pd-Pt alloy catalyst, and preparation method and application thereof
  • Low-platinum carbon-supported nanometer Pd-Pt alloy catalyst, and preparation method and application thereof
  • Low-platinum carbon-supported nanometer Pd-Pt alloy catalyst, and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0031] Take 20mL deionized water in a three-necked flask, and put 1050μL Na 2 PdCl 4 solution (0.05M), 456 μL K 2 PtCl 4 Solution (0.05M) and 753μL EDTA solution (0.1M) were added to it, the temperature was raised to 60°C, and the Pd and Pt metal ions were fully complexed after stirring well, then NaOH (0.1M) solution was added dropwise to adjust the pH value of the mixture to 10. Add 32 mg of dry pretreated XC-72 activated carbon into the three-necked flask, disperse by ultrasonic vibration for 0.5 h, and then strengthen stirring for 0.5 h, so that the complex of metal ions is evenly dispersed on the surface of the carbon, and the raw carbon slurry is obtained. During the stirring process, high-purity Ar gas was introduced to remove dissolved oxygen until the subsequent reduction reaction was completed.

[0032] Dissolve 36 g of sodium borohydride in 12 mL of Na 2 CO 3 (0.5M) solution, use a peristaltic pump to control the flow rate of 0.1mL / min to drop into the above-me...

Embodiment 2

[0035] Take 20mL deionized water in a three-necked flask, and put 1050μL Na 2 PdCl 4 solution (0.05M), 456 μL K 2 PtCl 4 Solution (0.05M) and 753 μL sodium citrate solution (0.1M) were added to it, the temperature was raised to 40°C, and the Pd and Pt metal ions were fully complexed after being fully stirred, then NaOH (0.1M) solution was added dropwise to adjust the pH of the mixture When the value reaches 11, add 32 mg of dry pretreated XC-72 activated carbon into the three-necked flask, disperse by ultrasonic vibration for 0.5 h, and then strengthen stirring for 0.5 h, so that the complex of metal ions is evenly dispersed on the surface of the carbon, and the raw carbon slurry is obtained. , During the process of dispersing and stirring, high-purity Ar gas was introduced to remove the dissolved oxygen until the subsequent reduction reaction was completed.

[0036] Dissolve 50 g of ascorbic acid in 12 mL of Na 2 CO 3 (0.5M) solution, use a peristaltic pump to control th...

Embodiment 3

[0039] Take 20mL deionized water in a three-necked flask, and put 1354μL Na 2 PdCl 4 solution (0.05M), 152 μL K 2 PtCl 4 Solution (0.05M) and 753μL ethylenediamine solution (0.1M) were added to it, the temperature was raised to 40°C, and the Pd and Pt metal ions were fully complexed after stirring fully, then NaOH (0.1M) solution was added dropwise to adjust the pH of the mixture When the value reaches 10, add 32mg of dry pretreated XC-72 activated carbon into the three-necked flask, disperse by ultrasonic vibration for 0.5h, and then strengthen stirring for 0.5h, so that the complex of metal ions is evenly dispersed on the surface of the carbon, and the raw carbon slurry is obtained. , During the process of dispersing and stirring, high-purity Ar gas was introduced to remove the dissolved oxygen until the subsequent reduction reaction was completed.

[0040] Dissolve 50 g of ascorbic acid in 12 mL of Na 2 CO 3 (0.5M) solution, use a peristaltic pump to control the flow r...

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Abstract

The invention belongs to the technical field of electrochemical energy, in particular to a low-platinum carbon-supported nanometer Pd-Pt alloy catalyst, and a preparation method and an application thereof. The invention provides the low-platinum carbon-supported nanometer Pd-Pt alloy catalyst; wherein, the Pd-Pt alloy catalyst particles are supported by carbon carrier, the content of Pd-Pt alloy in the carbon-supported nanometer Pd-Pt alloy catalyst is 1-60wt%, the molar ratio of Pd to Pt is 10:0.01-5 and the central particle size of the Pd-Pt alloy catalyst particles is 1.5-50nm. Compared with the traditional Pd / C and Pt / C catalyst, the low-platinum carbon-supported nanometer Pd-Pt alloy catalyst provided by the invention has better catalytic performance to the oxidation of formic acid and longer catalytic stability.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy, and in particular relates to a low-platinum carbon-supported nano-Pd-Pt alloy catalyst, a preparation method and an application thereof. Background technique [0002] A fuel cell is a device that directly converts chemical energy into electrical energy isothermally and electrochemically. Because it is not limited by the Carnot cycle, the energy conversion efficiency is high (40% to 60%), and the actual use efficiency is 2 to 3 times that of ordinary internal combustion engines; the system efficiency is less affected by load and capacity; no noise, almost no harmful Gas emission; in the case of continuous fuel supply, it can work continuously, with high power density and stable output; easy to use and safe to operate. It is for the above reasons that fuel cells have always been the focus of new energy development strategies. [0003] Proton exchange membrane fuel cells use solid p...

Claims

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Application Information

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IPC IPC(8): B01J23/44B01J23/42B01J35/02B01J37/16H01M4/92
CPCY02E60/50
Inventor 蔡文斌张涵轩王金意
Owner FUDAN UNIV
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