Preparation method of electrocatalyst with multiple defects and active sites

A technology of active sites and electrocatalysts, which is applied in the field of electrocatalyst preparation, can solve the problems of expensive metal catalysis, complicated preparation of electrodes, and low electrocatalytic efficiency, and achieve the goal of optimizing interfacial transmission resistance, simple process, and rich contact area Effect

Active Publication Date: 2021-10-01
HARBIN INST OF TECH
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Problems solved by technology

[0003] The present invention aims to solve the problems in the field of hydrogen production by electrolysis of water, such as expensive noble metal catalysis, scarce reserves, low electrocatalysis efficiency in electrocatalytic decomposition of water, poor stability in long-term use, and complicated preparation of electrodes by using powder type electrocatalysts, and provides a multi- Preparation of electrocatalysts with defects and active sites

Method used

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  • Preparation method of electrocatalyst with multiple defects and active sites

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specific Embodiment approach 1

[0016] Specific embodiment one: the preparation method of the electrocatalyst of a kind of multi-defect and active site described in this embodiment, it is finished according to the following steps:

[0017] 1. Stir and dissolve the metal salt, ammonium fluoride and urea in deionized water to obtain a mixed solution;

[0018] The concentration of metal salt in the mixed solution is 1mmol / L~500mmol / L; the concentration of ammonium fluoride in the mixed solution is 1mmol / L~200mmol / L; the concentration of urea in the mixed solution is 10mmol / L~1000mmol / L;

[0019] 2. Clean the conductive substrate, then immerse it in the mixed solution, keep it warm for 1h-24h at a temperature of 90°C to 180°C, and then cool it naturally to obtain a conductive substrate with precursors grown on it;

[0020] 3. Place the reaction source and the conductive substrate grown with the precursor in two temperature zones of the chemical vapor deposition device, and raise the temperature of the reaction...

specific Embodiment approach 2

[0026] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the cleaning of the conductive substrate described in step 2 is carried out according to the following steps: the conductive substrate is ultrasonically Wash for 1min to 5min, then ultrasonically clean with ethanol and water for 1min to 5min, and finally air dry for later use. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0027] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the conductive substrate described in step two is carbon cloth, carbon paper, foamed nickel, foamed copper, foamed cobalt, foamed iron, foamed nickel Iron, nickel foil, iron foil, copper foil, cobalt foil or nickel-iron alloy foil. Others are the same as in the first or second embodiment.

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Abstract

A method for preparing an electrocatalyst with multiple defects and active sites, the invention relates to a method for preparing an electrocatalyst. The invention aims to solve the problems of high price of noble metal catalysis in the field of hydrogen production by electrolysis of water, scarcity of reserves, low electrocatalysis efficiency in electrocatalytic decomposition of water, poor stability in long-term use, and complicated preparation of electrodes by using powder-type electrocatalysts. Method: 1. Stir and dissolve the metal salt, ammonium fluoride and urea in deionized water to obtain a mixed solution; 2. Immerse the conductive substrate in the mixed solution and keep it warm to obtain a conductive substrate with precursors grown on it; 3. The reaction source and the conductive substrate grown with the precursor are placed in a chemical vapor deposition device for reaction, that is, the preparation method of the electrocatalyst with multiple defects and active sites is completed.

Description

technical field [0001] The invention relates to a preparation method of an electrocatalyst. Background technique [0002] Currently, electrocatalytic water splitting is a clean, pollution-free, and scalable method for producing high-purity hydrogen. In order to overcome the huge energy barrier in the process of electrocatalytic water splitting, highly efficient electrocatalysts are often needed to reduce the overpotential of the hydrogen evolution reaction and oxygen evolution reaction, thereby reducing the total decomposition voltage of the entire reaction system, in order to achieve lower energy consumption. Efficient production of hydrogen under these conditions. However, the catalysts traditionally used for electrocatalytic water splitting are often Pt, RuO 2 , IrO 2 etc. It has problems such as high price and scarce reserves. At the same time, the use of different electrocatalysts on both sides of the cathode and anode in the electrocatalytic water splitting is ofte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/075C25B1/04B01J23/755B01J27/185
CPCB01J23/755B01J27/1853B01J35/0033C25B1/04C25B11/051C25B11/073Y02E60/36
Inventor 亓钧雷林景煌钟正祥闫耀天曹健冯吉才
Owner HARBIN INST OF TECH
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