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Preparation method of anode catalyst for water electrolysis reaction

A catalyst and water electrolysis technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of restricting the use of catalysts, low amount of deposited catalytic layer, low current density, etc., to achieve shortened preparation time, simple preparation process, high current effect of density

Active Publication Date: 2010-02-03
ENN SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The catalyst prepared by the electrodeposition method is layered, not nano-particle-shaped; and it is firmly adsorbed on the surface of the electrode, making it difficult to transfer
On the other hand, the catalyst prepared by the electrodeposition method is limited due to the concentration of the precursor solution, resulting in a low amount of deposited catalytic layer, so the current density is low (the highest value reported in the literature is 2mA / cm 2 ), resulting in low catalytic activity, which severely restricts the use of this catalyst in SPE water electrolysis and fuel cells

Method used

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  • Preparation method of anode catalyst for water electrolysis reaction
  • Preparation method of anode catalyst for water electrolysis reaction
  • Preparation method of anode catalyst for water electrolysis reaction

Examples

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Embodiment 1

[0027] In 0.1M cobalt nitrate solution, under ultrasonic stirring, 0.1M potassium phosphate solution (solution pH value is 9) was added dropwise at a rate of 5 mL / min, and ultrasonically stirred evenly. The suspension was filtered, the filter cake was washed with deionized water, and dried overnight at 80°C. Mix the obtained powder with isopropanol, disperse the slurry uniformly by ultrasonic, and spray it on the ITO conductive glass. The conductive glass was put into 0.1M potassium phosphate buffer solution with a pH value of 7 for electrolytic activation, with a constant voltage of 1.29V for 3 hours. After drying at room temperature, the obtained cobalt-phosphorus catalyst was soaked in 1M KOH solution and transferred from the ITO conductive glass, and dried overnight at 70°C. The cobalt phosphorus catalyst is tested by a transmission electron microscope, and the result shows that its morphology is a porous ball with a particle diameter of 1-2 μm, and there are many pores o...

Embodiment 2

[0031] Into a mixed solution of 0.1M ferrous sulfate and 0.1M nickel sulfate, under ultrasonic stirring, 0.1M potassium hydroxide solution (pH value of the solution is 10) was added dropwise, and ultrasonically stirred evenly. The suspension was filtered, the filter cake was washed with deionized water, and dried overnight at 70°C. Mix the obtained powder with the alkaline polymer electrolyte membrane solution, and disperse the slurry uniformly by ultrasonic to form a membrane electrode, assemble it into an electrolytic cell, pass distilled water at a speed of 7mL / min, and conduct electrolytic activation at a constant voltage of 2.2V. 3 hours. The membrane electrode made of this nickel-iron catalyst can reach a current density of 120mA / cm in an electrolytic cell at a voltage of 1.8V 2 .

Embodiment 3

[0033]In 0.1M cobalt sulfate solution, under ultrasonic stirring, 0.5M potassium phosphate buffer solution (pH value is 9) was added dropwise, and ultrasonically stirred evenly. The suspension was filtered, the filter cake was washed with deionized water, and dried overnight at 80°C. The prepared solid powder was mixed with isopropanol, the slurry was ultrasonically dispersed, and sprayed onto glassy carbon. The glassy carbon was put into 0.2M potassium phosphate buffer solution with a pH value of 9 for electrolytic activation with a constant voltage of 1.69V for 3 hours. After drying at room temperature, the obtained cobalt-phosphorous catalyst was soaked in 1M KOH solution and transferred from glassy carbon, filtered, and dried overnight at 60°C.

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Abstract

The invention provides a preparation method of an anode catalyst for water electrolysis reaction, comprising the following steps: a. adding solution containing catalyst precursors into an alkaline buffer solution to obtain precipitate powder by chemical precipitation; and b. performing electrolytic activation to the precipitate powder to obtain the catalyst. By adopting the method, high productionefficiency of the catalyst is ensured, and the obtained catalyst has high catalysis activity and is easy to transfer.

Description

technical field [0001] The invention relates to a preparation method of an anode catalyst for water electrolysis reaction. Background technique [0002] In the current field of water electrolysis, SPE (Solid Polymer Electrolyte, solid polymer electrolyte) technology has become the main development direction. The main problem limiting the industrial application of SPE water electrolysis technology is the high material cost, and the key to reducing the cost is the selection and preparation process of the cathode and anode electrocatalysts. At present, almost all SPE water electrolysis systems in the world are based on proton exchange membrane (PEM). In the SPE water electrolysis system using proton exchange membrane, the proton exchange membrane used has strong acidity after soaking in water, which limits the choice of catalyst metals to almost completely limited to platinum, ruthenium, iridium and other precious metals and their alloys and oxides. Due to their remarkable ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/06C25B1/10
CPCY02E60/366Y02E60/36
Inventor 刘涛曹萌王雁丁哲波
Owner ENN SCI & TECH DEV
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