Nitrogen and phosphorus co-doped cobalt-based carbon fiber multifunctional electrochemical catalyst and preparation method thereof

A cobalt-based carbon fiber and co-doping technology is applied in the direction of fuel cell half-cells and primary battery half-cells, circuits, electrical components, etc. It can solve the problem of single catalytic activity and achieve increased activity and stability. The effect of a simple yet effective preparation method

Active Publication Date: 2017-05-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention is to solve the technical problem of single catalytic activity of existing nitrogen / transition metal co-doped carbon materials, and provide nitrogen and phosphorus co-doped cobalt-based carbon fiber multifunctional electrochemical catalyst and its preparation method

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  • Nitrogen and phosphorus co-doped cobalt-based carbon fiber multifunctional electrochemical catalyst and preparation method thereof
  • Nitrogen and phosphorus co-doped cobalt-based carbon fiber multifunctional electrochemical catalyst and preparation method thereof
  • Nitrogen and phosphorus co-doped cobalt-based carbon fiber multifunctional electrochemical catalyst and preparation method thereof

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specific Embodiment approach 1

[0021] Specific embodiment one: The nitrogen and phosphorus co-doped cobalt-based carbon fiber multifunctional electrochemical catalyst of this embodiment is formed by co-doping nitrogen and phosphorus into cobalt-based carbon fibers, wherein Co:N:P=4x:x: y, x=1-2, y=1-4, cobalt in the cobalt-based carbon fiber is loaded on the surface of the carbon fiber.

specific Embodiment approach 2

[0022] Specific embodiment two: the preparation method of nitrogen and phosphorus co-doped cobalt-based carbon fiber multifunctional electrochemical catalyst material described in specific embodiment one is as follows:

[0023] 1. Preparation of electrospinning precursor solution: according to the molar ratio of Co:N:P=4x:x:y, respectively weigh cobalt nitrate, urea and triphenylphosphine, and add them to N,N-dimethylformamide ( DMF), stirred at room temperature until cobalt nitrate, urea and triphenylphosphine were completely dissolved, then added polyvinylpyrrolidone (PVP) and stirred for 4 to 6 hours to obtain a completely dissolved transparent electrospinning precursor solution; where x=1 ~2, y=1~4;

[0024] 2. Electrospinning: inject the electrospinning precursor solution obtained in step 1 into a syringe with a stainless steel needle, place the syringe on the spinning machine, and apply a constant high-voltage DC voltage between the stainless steel needle and the receivi...

specific Embodiment approach 3

[0026] Embodiment 3: This embodiment differs from Embodiment 2 in that: the total mass concentration of cobalt nitrate, urea and triphenylphosphine in the electrospinning precursor solution in step 1 is 10%-25%. Other conditions are the same as in the second embodiment.

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Abstract

The invention discloses a nitrogen and phosphorus co-doped cobalt-based carbon fiber multifunctional electrochemical catalyst and a preparation method thereof, relates to electrochemical catalysts and preparation methods thereof, and aims at solving the technical problem of single catalytic activity of an existing nitrogen / transition metal co-doped carbon material. The electrochemical catalyst disclosed by the invention is formed by codoping nitrogen and phosphorus into a cobalt-based carbon fiber; Co:N:P=4x:x:y; x=1-2; y=1-4; and cobalt is loaded on the surface of the carbon fiber. The preparation method comprises the following steps: (1) adding cobalt nitrate, urea and triphenyl phosphine to N,N-dimethyl formamide, stirring the cobalt nitrate, the urea and the triphenyl phosphine until dissolving, adding polyvinyl pyrrolidone, and stirring and dissolving the polyvinyl pyrrolidone to obtain an electrostatic spinning precursor solution; (2) carrying out electrostatic spinning; and (3) sintering the precursor solution, so as to obtain the nitrogen and phosphorus co-doped cobalt-based carbon fiber multifunctional electrochemical catalyst. The catalyst has oxygen reduction catalysis activity and hydrogen evolution catalysis activity, has oxygen reduction catalysis activity under different acid and alkaline conditions, and can be applied to lithium-air cells and fuel cells.

Description

technical field [0001] The invention relates to a lithium-air battery, a fuel battery and a water-splitting multifunctional electrochemical catalyst and a preparation method thereof. Background technique [0002] At present, global environmental pollution and energy crisis have become two serious problems. Therefore, people need to urgently research and develop a new, green, high-performance energy storage technology, such as metal-air batteries and fuel cells. Among them, in different battery reaction processes, oxygen reduction process, oxygen evolution process and hydrogen evolution process all play a vital role, but the above reaction process itself does not have good reaction kinetics and reaction efficiency. Therefore, we need to study a high-performance electrochemical catalyst to improve the reaction rate and battery performance of the battery. So far, noble metal-based catalysts are considered to be the most effective electrochemical catalysts, but due to their re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/90H01M4/96H01M12/06B01J27/24
CPCB01J27/24H01M4/88H01M4/9083H01M4/96H01M12/06
Inventor 熊岳平王状左朋建樊丽权韩嘉男尹鸽平
Owner HARBIN INST OF TECH
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