Carbon supported transition metal atom pair electrocatalyst and preparation method and application thereof

A technology of transition metals and electrocatalysts, which is applied in circuits, electrical components, battery electrodes, etc., can solve the problems of not being widely used, limited active sites, and limitations in the activity and stability of oxygen reduction catalysts, and achieves low price and high equipment efficiency. Effect of simplicity, excellent oxygen reduction catalytic activity and stability

Inactive Publication Date: 2019-04-26
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above two non-precious metal oxygen reduction catalysts have limited active sites, which have certain limitations on the activity and stability of oxygen reduction catalysts, and cannot be widely used.

Method used

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  • Carbon supported transition metal atom pair electrocatalyst and preparation method and application thereof
  • Carbon supported transition metal atom pair electrocatalyst and preparation method and application thereof
  • Carbon supported transition metal atom pair electrocatalyst and preparation method and application thereof

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preparation example Construction

[0033] The invention provides a preparation method of a carbon-supported transition metal atom pair electrocatalyst, which comprises the following steps:

[0034] (1) The nitrogen-containing carbon source and the double transition metal source are dissolved in water in sequence, and the precipitation reaction is carried out to obtain the precursor system;

[0035] (2) The water in the precursor system obtained in step (1) is evaporated and ground to obtain a catalyst precursor;

[0036] (3) The catalyst precursor obtained in the step (2) is sequentially pyrolyzed and annealed in a protective atmosphere to obtain the carbon-supported transition metal atom pair electrocatalyst;

[0037] In the step (1), the two transition metal sources in the dual transition metal source are separately soluble in water;

[0038] The temperature of pyrolysis in the step (3) is 500-1000°C, and the time is 4-8h.

[0039] In the present invention, the nitrogen-containing carbon source and the double transition...

Embodiment 1

[0057] (1) Stir 1g chitosan, 1g cobalt acetate and 100mL water; then add 20mL zinc chloride aqueous solution with a concentration of 0.88mol / L to form a mixed solution. The concentration of cobalt acetate in the mixed solution is 0.05mol / L , The concentration of zinc chloride is 0.15 mol / L; the mixed solution is precipitated at room temperature and stirring conditionally for 8 hours to obtain the precursor system;

[0058] (2) Steam the water in the precursor system at 85°C, and then grind it into a catalyst precursor with a particle size of 10 μm;

[0059] (3) Raise the catalyst precursor to 750°C at 5°C / min and pyrolyze it for 4h; then soak it with 1mol / L nitric acid for 12h, wash it with deionized water, filter and dry it; at 5°C / The heating rate was increased to 900°C for 2 hours at a heating rate of 1 min, and the electrocatalyst was obtained by annealing and holding a carbon-supported transition metal atom.

Embodiment 2

[0061] (1) After mixing 1g of glycine, 1.6g of cobalt acetate and 100mL of water, add 1.6g of sodium diethyldithiocarbamate trihydrate and 2.4g of ferric chloride successively to form a mixed solution. The concentration is 0.09mol / L, the concentration of ferric chloride is 0.15mol / L, and the concentration of sodium diethyldithiocarbamate is 0.071mol / L; the mixed solution undergoes precipitation reaction at room temperature and stirring conditions for 8 hours to obtain the former Body system

[0062] (2) Steam the water in the precursor system at 85°C, and then grind it into a catalyst precursor with a particle size of 10 μm;

[0063] (3) Raise the catalyst precursor to 750°C at 5°C / min and pyrolyze it for 4h; then soak it with 1mol / L nitric acid for 12h, wash it with deionized water, filter and dry it; at 5°C / The heating rate was increased to 900°C for 2 hours at a heating rate of 1 min, and the electrocatalyst was obtained by annealing and holding a carbon-supported transition m...

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Abstract

The invention provides a carbon supported transition metal atom pair electrocatalyst and a preparation method and application thereof and belongs to the technical field of electrocatalysts. A nitrogen-containing carbon source is used as a carbon source and a nitrogen source, a catalyst precursor with uniformly dispersed transition metal diatom pairs on a carbon substrate is formed through precipitation reaction due to the complexation between transition metal ions and the nitrogen-containing carbon source, and the catalyst precursor is pyrolyzed and annealed in a protective atmosphere of 500-1000 DEG C so that the transition metal diatom pairs are dispersed on a porous carbon material to obtain the electrocatalyst. The double transition metal atoms are introduced, so that the number of active sites of the electrocatalyst can be increased, the activity and the oxygen reduction activity of the electrocatalyst can be effectively improved, and the electrocatalyst has wide application prospect in the fields of metal air batteries and fuel cells. In addition, the preparation method is simple, the price of the required raw materials is low, the equipment is simple, and large-scale industrial production is easy to achieve.

Description

Technical field [0001] The invention relates to the technical field of electrocatalysts, in particular to a carbon-supported transition metal atom pair electrocatalyst and a preparation method and application thereof. Background technique [0002] The fuel cell is a device that can directly convert the chemical energy stored in the fuel into electric energy. Among them, the proton exchange membrane fuel cell (PEMFC) uses hydrogen or methanol as the fuel. The storage and transportation of the fuel is very convenient, and it is suitable for electric vehicles / power generation. Machine, its application prospects are very broad. Although PEMFC has had preliminary applications, there are still many technical problems in large-scale commercialization, especially the research on catalysts. There are two main reactions in PEMFC, which are the fuel oxidation reaction that occurs at the anode and the oxygen reduction reaction that occurs at the cathode. A catalyst is needed to accelerate t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90B82Y30/00
CPCB82Y30/00H01M4/8825H01M4/9041H01M4/9083Y02E60/50
Inventor 赵玉峰刘得鑫李宏观
Owner YANSHAN UNIV
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