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A kind of cobalt-based transition metal oxygen reduction catalyst and its preparation method and application

A transition metal and catalyst technology, applied in the field of cobalt-based transition metal oxygen reduction catalyst and its preparation, can solve the problems of low efficiency and low practicability of the oxygen reduction catalyst, and achieve good methanol poisoning resistance, simple preparation process and high catalytic performance. Effects of Oxygen Activity and Catalytic Stability

Inactive Publication Date: 2017-04-26
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, so far, the efficiency of the prepared oxygen reduction catalyst is still low, and the practicability is not high. In addition, the stability is also an important factor limiting the development of this type of catalyst.

Method used

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  • A kind of cobalt-based transition metal oxygen reduction catalyst and its preparation method and application
  • A kind of cobalt-based transition metal oxygen reduction catalyst and its preparation method and application
  • A kind of cobalt-based transition metal oxygen reduction catalyst and its preparation method and application

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preparation example Construction

[0027] The preparation method of the cobalt-based transition metal oxygen reduction catalyst of the present invention comprises the following steps: respectively adding cobalt salt and nitrogen-containing organic ligands into ethanol to make the two fully react to form a cobalt complex solution; adding Carbon material, reflux reaction in an oil bath, so that the cobalt complex is evenly adsorbed on the surface of the carbon material; evaporate to remove ethanol, and grind the remaining material evenly to obtain a black powder; the black powder is in an inert gas environment, at 600 ~ 900 The cobalt-based transition metal oxygen reduction catalyst can be obtained by heat treatment at 0.5°C for 0.5-3 hours.

[0028] Specifically, the mass concentration of cobalt salt in ethanol is 2-4 mg / mL, the molar ratio of cobalt salt to nitrogen-containing organic ligand is 1:2, and the total mass of cobalt salt, nitrogen-containing organic ligand and carbon material is Based on 100%, the m...

Embodiment 1

[0036] 119mg of cobalt chloride hexahydrate and 198mg of phenanthroline were added to 50ml of ethanol respectively (the mass concentration of cobalt chloride hexahydrate in ethanol is 2.38mg / mL, the molar ratio of cobalt chloride hexahydrate and phenanthroline ratio of 1:2), stirred for 30 minutes to fully react the two to form a cobalt complex solution; add 438.5mg ECP600JD carbon black (based on the total mass of cobalt chloride hexahydrate, phenanthroline and carbon black) to the above solution as 100%, the mass fraction of carbon black is 58%), and then reflux reaction in an oil bath for 4 hours, so that the cobalt complex is evenly adsorbed on the surface of carbon black; use a rotary evaporator to remove ethanol, and grind the obtained sample Uniform, black powder is obtained; the black powder is transferred to a nitrogen-protected high-temperature tube furnace, and heat-treated at 700° C. for 0.5 hour, and the obtained product is a cobalt-based transition metal oxygen re...

Embodiment 2

[0046] The cobalt chloride hexahydrate and 131mg bipyridyl are joined respectively in 50ml ethanol solution (the mass concentration of cobalt chloride hexahydrate in ethanol is 2mg / mL, the mol ratio of cobalt chloride hexahydrate and bipyridine is 1: 2), stirring for 30 minutes to fully react the two to form a cobalt complex solution; add 231 mg of carbon nanotubes to the above solution (based on the total mass of cobalt chloride hexahydrate, bipyridyl and carbon nanotubes as 100%, carbon The mass fraction of the nanotubes is 50%), and then reflux reaction in an oil bath for 6 hours, so that the cobalt complex is evenly adsorbed on the surface of the carbon nanotubes; the ethanol is removed by a rotary evaporator, and the obtained sample is ground evenly to obtain a black powder; the black powder was transferred to a high-temperature tube furnace protected by argon, and heat-treated at 800° C. for 1 hour, and the obtained product was a cobalt-based transition metal oxygen reduc...

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Abstract

The invention discloses a cobalt-based transition metal oxygen reduction catalyst, a preparation method and application thereof. The method including the steps of: adding a cobalt salt and a nitrogen-containing organic ligand into ethanol respectively and letting the two substances fully react to form a cobalt complex solution; adding a carbon material into the solution, and carrying out reflux reaction in oil bath to make the cobalt complex uniformly adsorbed on the carbon material surface; removing ethanol by evaporation, and grinding the remaining material uniformly to obtain black powder; and conducting heat treatment on the black powder in an inert gas atmosphere for 0.5-3h at 600-900DEG C, thus obtaining the cobalt-based transition metal oxygen reduction catalyst. The catalyst abandons the noble metal platinum, effectively reduces the making cost of fuel cells, and has very high oxygen catalytic activity, high catalytic stability and good methanol poisoning resistance, is easy to realize mass production, and can be widely used in fuel cells.

Description

technical field [0001] The invention belongs to the technical field of fuel cell catalysts, and more specifically relates to a cobalt-based transition metal oxygen reduction catalyst and its preparation method and application. Background technique [0002] The modernization of the world economy has benefited from the wide application of fossil energy, such as oil, natural gas and coal. However, with the depletion of fossil energy and the pollution of the environment during use, we are required to develop clean and renewable energy as soon as possible. Proton exchange membrane fuel cells have attracted widespread attention due to their clean, efficient, safe, mobile, and mild operating conditions. The two electrode reactions that make up this type of battery are the hydrogen oxidation reaction (HOR) at the anode and the oxygen reduction reaction (ORR) at the cathode. Compared with HOR, electrochemical ORR is a complex multi-step reaction process, which is the key research o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/75H01M4/90
CPCY02E60/50
Inventor 申燕黄德康罗艳平王鸣魁
Owner HUAZHONG UNIV OF SCI & TECH
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