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Method for preparing bifunctional cobalt, nitrogen and oxygen doped carbon in-situ composite electrode

An in-situ composite and in-situ electrode technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of high price and promotion

Active Publication Date: 2019-04-05
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, yttrium and ruthenium are rare metal materials, which are expensive, and their overpotentials for catalyzing OER reactions are generally greater than 300mV, and their performance still needs to be improved for practical use.

Method used

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  • Method for preparing bifunctional cobalt, nitrogen and oxygen doped carbon in-situ composite electrode
  • Method for preparing bifunctional cobalt, nitrogen and oxygen doped carbon in-situ composite electrode
  • Method for preparing bifunctional cobalt, nitrogen and oxygen doped carbon in-situ composite electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0025] At room temperature, carbon paper was electrodeposited in an aqueous solution of cobalt nitrate hexahydrate, in which the concentration of cobalt nitrate hexahydrate was 150 mM, the voltage was -1.0 V, and the time was 90 s. Afterwards, rinse repeatedly with deionized water and dry at 80°C for 10 minutes on a hot stage. Put the deposited carbon paper into a tube furnace, react at 400°C for 30 minutes under Air flow, and take it out after naturally cooling to room temperature to obtain the carbon paper grown on the carbon paper. In situ electrodes of cobalt oxide arrays in the form of porous sheets. Dissolve Tx-100 and dicyandiamide in 2.0mL N,N-dimethylformamide solution to obtain a precursor solution, wherein the amount of Tx-100 is 1.0mL, and the concentration of dicyandiamide is 2000mM. Soak the porous cobalt oxide array in-situ electrode grown on carbon paper in the precursor solution for 30 minutes, take it out, dry it on a hot table at 80°C for 10 minutes, then ev...

Embodiment 2

[0028] At room temperature, the carbon paper was electrodeposited in an aqueous solution of cobalt nitrate hexahydrate, in which the concentration of cobalt nitrate hexahydrate was 150 mM, the voltage was -1.0 V, and the time was 180 s. Afterwards, rinse repeatedly with deionized water and dry at 80°C for 10 minutes on a hot stage. Put the deposited carbon paper into a tube furnace, react at 400°C for 30 minutes under Air flow, and take it out after naturally cooling to room temperature to obtain the carbon paper grown on the carbon paper. In situ electrodes of cobalt oxide arrays in the form of porous sheets. Dissolve Tx-100 and dicyandiamide in 2.0 mL of N,N-dimethylformamide solution to obtain a precursor solution, wherein the amount of Tx-100 is 1.0 mL, and the concentration of dicyandiamide is 2000 mM. Soak the porous cobalt oxide array in-situ electrode grown on carbon paper in the precursor solution for 30 minutes, take it out, dry it on a hot table at 80°C for 10 minut...

Embodiment 3

[0034] At room temperature, the carbon paper was electrodeposited in an aqueous solution of cobalt nitrate hexahydrate, in which the concentration of cobalt nitrate hexahydrate was 150 mM, the voltage was -1.0 V, and the time was 270 s. Afterwards, rinse repeatedly with deionized water and dry at 80°C for 10 minutes on a hot stage. Put the deposited carbon paper into a tube furnace, react at 400°C for 30 minutes under Air flow, and take it out after naturally cooling to room temperature to obtain the carbon paper grown on the carbon paper. In situ electrodes of cobalt oxide arrays in the form of porous sheets. Dissolve Tx-100 and dicyandiamide in 2.0 mL of N,N-dimethylformamide solution to obtain a precursor solution, wherein the amount of Tx-100 is 1.0 mL, and the concentration of dicyandiamide is 2000 mM. Soak the porous cobalt oxide array in-situ electrode grown on carbon paper in the precursor solution for 30 minutes, take it out, dry it on a hot table at 80°C for 10 minut...

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Abstract

The invention provides a method for preparing a bifunctional cobalt, nitrogen and oxygen doped carbon in-situ composite electrode. Electro-deposition and air atmosphere annealing are used to prepare asheet-like cobalt oxide array in-situ electrode. A forehead fluid containing dicyandiamide and triton is loaded onto the surface of the cobalt array in-situ electrode, dried and then annealed under aprotective atmosphere. The triton is gradually dehydrogenated, deoxidized and partially graphitized to form a carbon material under the protective atmosphere, and since the triton contains a large amount of oxygen, a large amount of oxygen is incorporated into the carbon materials in the form of an ether group, a carbonyl group or a carboxyl group. The ammonia gas generated by the decomposition of dicyandiamide causes the carbon material to be doped with nitrogen while reducing the cobalt oxide to cobalt particles. The product of the invention constructs a plurality of high electrocatalytic active sites, including nitrogen and oxygen doped active sites in the carbon materials, other lattice defects caused thereby, strong coupling interfaces of carbon materials and cobalt, etc., so that oxygen evolution reaction and oxygen reduction reaction through electro-catalysis is realized. The dual-function electrocatalyst has prospects of application in fuel cells and zinc-air batteries.

Description

technical field [0001] The invention relates to an in-situ electrode and its preparation, and belongs to the field of energy storage and conversion materials and devices. Background technique [0002] Recently, electrocatalysts play an increasingly important role in the field of energy conversion and storage and become a research hotspot. For example, electrocatalysts that can catalyze the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) play a crucial role in the performance cost of fuel cells and metal-air batteries. Currently, platinum and its derivatives are by far the most effective electrocatalysts for ORR. However, platinum is expensive and inert platinum oxide is easy to form on the surface after long-term working in an alkaline environment. In addition, platinum is easily poisoned by fuel oxidative molecules, such as methanol, and the performance will drop sharply. Yttrium oxide and ruthenium oxide are often used as anodes in electrolysis of wat...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90
CPCH01M4/8807H01M4/8882H01M4/9016H01M4/9083Y02E60/50
Inventor 黄妞杨柳闫术芳丁玉岳
Owner CHINA THREE GORGES UNIV
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