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Cobalt nitride compound and preparation method thereof as well as methanol fuel cell catalyst and preparation method thereof

A cobalt nitride compound, methanol fuel cell technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, nitrogen-metal/silicon/boron binary compound, etc., can solve uneven distribution and increase electrochemical reaction speed , large catalyst particle size, etc.

Inactive Publication Date: 2010-11-17
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Lai Yuan, Zhou Debi, Hu Jianwen, Cui Lili; "Electrochemical Performance of Co-N / C Composite Catalysts for Alkaline Fuel Cells", Acta Chemie Sinica, Volume 66, 2008, reported that the chemical formula is Co 5.47 N cobalt nitride, but the catalyst prepared by this preparation method has a large particle size and uneven distribution, which limits the improvement of the electrochemical reaction rate.

Method used

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  • Cobalt nitride compound and preparation method thereof as well as methanol fuel cell catalyst and preparation method thereof
  • Cobalt nitride compound and preparation method thereof as well as methanol fuel cell catalyst and preparation method thereof
  • Cobalt nitride compound and preparation method thereof as well as methanol fuel cell catalyst and preparation method thereof

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preparation example Construction

[0017] In the preparation method of the above-mentioned cobalt nitride compound, the reaction raw material cobalt acetate with a particle size of 300-500nm is sintered at high temperature in the presence of a nitrogen source atmosphere to obtain the cobalt nitride compound.

[0018] A methanol fuel cell catalyst, the catalyst contains the above-mentioned cobalt nitride compound and a carrier for supporting the cobalt nitride compound.

[0019] The carrier is known to those skilled in the art, such as acetylene black, activated carbon, superconducting carbon black, preferably Vulcan X-72R carbon powder.

[0020] The prepared catalyst has an average particle diameter of 100nm-200nm.

[0021] The cobalt nitride compound and the carrier used to support the cobalt nitride compound are used as a reference, wherein the mass percentage of the cobalt nitride compound is 30wt%-40wt%.

[0022] The equation of reaction of the present invention is:

[0023] Co(CH 3 COO) 2 →Co(C 2 o 4...

Embodiment 1

[0042] Average particle size is 400nm cobalt acetate Co (Ac) 4.48g is put into the porcelain boat, and the porcelain boat is put into the tube furnace, after getting rid of the air in the tube furnace with NH3, continue to pass into NH3, furnace temperature Raise to 450°C and keep the temperature for 1 hour, then raise the furnace temperature to 800°C and keep the temperature for 2 hours. After the furnace temperature drops to room temperature, stop feeding NH3 to obtain cobalt nitride compound A.

Embodiment 2

[0044] 1. Pretreatment of carrier carbon black

[0045] Weigh 5g of carbon black and soak it in concentrated hydrochloric acid solution to remove possible chloride impurities. After washing, put it into concentrated nitric acid solution to soak and oxidize. Wash with a large amount of deionized water and then dry it.

[0046] 2. Preparation of catalyst

[0047] Weigh 4.48 g of cobalt acetate Co(Ac) and 3.12 g of pretreated carbon black, put them into a beaker filled with 100 mL of distilled water, stir for 2 hours, dry the water in an oven, and perform high-speed ball milling in an anhydrous ethanol medium 2h, put it into a tube furnace until the average particle size is 400nm, and sinter at high temperature with the method of Example 1 to obtain catalyst B.

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Abstract

The invention provides a cobalt nitride compound. The chemical formula of cobalt nitride is CoN1.2. The invention also provides a preparation method of the cobalt nitride compound, wherein the average grain size of a reaction raw material namely cobalt acetate is 300 to 500 nanometers, and the cobalt acetate is sintered at a high temperature in the presence of a nitrogen source atmosphere to obtain the cobalt nitride compound. The invention also provides a methanol fuel cell catalyst and a preparation method thereof, wherein the catalyst comprises the cobalt nitride compound and a carrier for loading the cobalt nitride compound. The preparation method of the methanol fuel cell catalyst comprises the following steps of: performing ball milling on the reaction raw material cobalt acetate and the carrier for loading the cobalt nitride compound to ensure that the average grain size is 300 to 500 nanometers; and performing high temperature sintering in the presence of the nitrogen source atmosphere to obtain the catalyst.

Description

technical field [0001] The invention relates to a cobalt nitride compound and a preparation method thereof, as well as a methanol fuel cell catalyst and a preparation method thereof. Background technique [0002] Direct methanol fuel cells directly use methanol as the anode fuel, and the cathode uses air or oxygen as the oxidant to generate electricity. At the same time, the intermediate product carbon monoxide (CO) generated by methanol during anodic oxidation can poison platinum, and the generated CO is strongly adsorbed on Pt, firmly occupying the surface active sites of Pt, thereby hindering the adsorption and decomposition of methanol. To avoid CO poisoning, the current design of direct methanol fuel cell catalysts is to directly add rare metals and precious metals to the anode catalyst, such as carbon-supported platinum-ruthenium as the catalyst. But such catalysts are too expensive. [0003] In recent years, the research on nitrides as electrocatalysts for the reduc...

Claims

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Application Information

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IPC IPC(8): C01B21/06B01J27/24B01J37/08
Inventor 赖渊周良吕新坤
Owner BYD CO LTD
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