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Preparation method of high-performance palladium tungsten oxygen reduction electrocatalyst

An electrocatalyst and high-performance technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problems of transition metal loss and poor catalyst stability, and achieve The effect of low performance degradation

Inactive Publication Date: 2014-08-27
代斌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the transition metals in the alloy catalyst are easy to lose under acidic conditions, so the stability of the catalyst is relatively poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1100

[0009] Example After 1100 mg XC-72R activated carbon was ultrasonically dispersed in 0.5M hydrochloric acid solution, 1 mL of aniline was added, and 10 mg (NH 4 ) 2 S 2 O 8 Then, it was stirred for 2 hours, filtered, washed with 1 L of deionized water, and dried at 60° C. for 4 hours. The obtained sample was ultrasonically dispersed in 100 mL of ethylene glycol solution, 1 mM phosphotungstic acid was added, and after stirring for 2 hours, palladium chloride solution was added to adjust the pH to 11, and heated at 100° C. for 2 hours. After the obtained sample was filtered, washed with 1 L of deionized water, and dried under vacuum at a temperature of 100° C. to prepare a palladium tungsten catalyst. Take 5 mg of palladium tungsten catalyst, add 1 mL of ethanol and 50 μl of 5% Nafion solution, and ultrasonically disperse. Take 20mg of the slurry and apply it to the surface of the microelectrode. The microelectrode is 0.5M sulfuric acid solution. At 1600rpm, the potential window ...

Embodiment 2150

[0010] Example 2150mg XC-72R activated carbon was ultrasonically dispersed in 0.5M hydrochloric acid solution, 1.5mL of aniline was added, and 15mg (NH 4 ) 2 5 2 O 8 Then, it was stirred for 2 hours, filtered, washed with 1 L of deionized water, and dried at 60° C. for 4 hours. The obtained sample was ultrasonically dispersed in 150 mL of ethylene glycol solution, 1.5 mM phosphotungstic acid was added, and after stirring for 2 hours, palladium chloride solution was added to adjust the pH to 11, and heated at 100° C. for 2 hours. After the obtained sample was filtered, washed with 1 L of deionized water, and dried under vacuum at a temperature of 100° C. to prepare a palladium tungsten catalyst. Take 5 mg of palladium tungsten catalyst, add 1 mL of ethanol and 50 μl of 5% Nafion solution, and ultrasonically disperse. Take 20mg of the slurry and apply it to the surface of the microelectrode. The microelectrode is 0.5M sulfuric acid solution. At 1600rpm, the potential window of 0-...

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PUM

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Abstract

The invention relates to a preparation method of a high-performance palladium tungsten oxygen reduction electrocatalyst. The method comprises the following steps: depositing polyaniline on the surface of XC-72R active carbon, and adding phosphotungstic acid to realize the adsorption of anions of phosphotungstic acid on the surface of a carrier; and loading palladium nano-particles on the carrier with glycol as a reducing agent to prepare the palladium tungsten electrocatalyst. When the electrocatalyst is applied in an oxygen reduction electrochemical reaction, the current density under 0.85V reaches 0.38mA / cm<2>, and accounts for 98% of that of a same load of platinum.

Description

Technical field [0001] The invention belongs to the technical field of fuel cell technology and new energy materials, and specifically relates to a preparation method of a high-performance palladium tungsten oxygen reduction electrocatalyst. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) has the advantages of low operating temperature, fast start-up, high specific power, simple structure and convenient operation. It is recognized as the preferred energy source for electric vehicles and fixed power stations. Oxygen reduction reaction (ORR) mainly occurs on the surface of the PEMFC cathode electrocatalyst, and the overpotential generated by the ORR process is closely related to the performance of the PEMFC battery. The noble metal platinum and its alloy electrocatalysts with transition metals are widely used as PEMFC cathode electrocatalysts. However, platinum resources are scarce and expensive. The cost of electrocatalysts accounts for more than 50% of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/652H01M4/90
CPCY02E60/50
Inventor 代斌朱明远高晓玲汤玲罗光琴
Owner 代斌