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Preparation method and application of amorphous cobalt borate nanorod efficient oxygen evolution electrocatalyst

An electrocatalyst, cobalt nanotechnology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problems of reports, no patents and academic literature, etc., and achieve the product Single, excellent electrochemical performance, simple operation effect

Active Publication Date: 2019-04-16
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, up to now, there are no relevant patents and academic literature reports

Method used

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  • Preparation method and application of amorphous cobalt borate nanorod efficient oxygen evolution electrocatalyst
  • Preparation method and application of amorphous cobalt borate nanorod efficient oxygen evolution electrocatalyst
  • Preparation method and application of amorphous cobalt borate nanorod efficient oxygen evolution electrocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In this example, the preparation method of the amorphous cobalt borate nanorod electrocatalyzed water desorption oxygen catalyst is as follows:

[0037] (1) Weigh 0.04mol cobalt nitrate hexahydrate and add it to 60mL deionized water, and stir magnetically for 10 minutes at room temperature. After it is completely dissolved, add 0.02mol sodium tetraborate decahydrate to the solution, and stir for 30 minutes to completely dissolve to obtain the reaction Precursor solution.

[0038] (2) The reaction precursor solution prepared in step (1) was transferred to a 100 mL polytetrafluoro-lined stainless steel hydrothermal reaction kettle, and heated and reacted at 180° C. for 16 hours.

[0039] (3) After the reaction is finished, after cooling down to room temperature naturally, the obtained reaction precipitates are centrifuged three times with deionized water and ethanol respectively, and centrifuged at 6000rpm for 10 minutes each time; deionized water, and transferred to a r...

Embodiment 2

[0042] In this example, the preparation method of the amorphous cobalt borate nanorod electrocatalyzed water desorption oxygen catalyst is as follows:

[0043] (1) Weigh 0.05mol cobalt nitrate hexahydrate and add it to 60mL deionized water, stir magnetically at room temperature for 10 minutes, after it is completely dissolved, add 0.02mol sodium tetraborate decahydrate to the solution, stir for 30 minutes to completely dissolve to obtain the reaction Precursor solution.

[0044] (2) The reaction precursor solution prepared in step (1) was transferred to a 100 mL polytetrafluoro-lined stainless steel hydrothermal reaction kettle, and heated and reacted at 160° C. for 12 hours.

[0045] (3) After the reaction is finished, after cooling down to room temperature naturally, the obtained reaction precipitates are centrifuged and washed three times with deionized water and ethanol, each time at 10,000 rpm for 20 minutes; deionized water and transferred to a refrigerator for 24 hours...

Embodiment 3

[0048] In this example, the preparation method of the amorphous cobalt borate nanorod electrocatalyzed water desorption oxygen catalyst is as follows:

[0049] (1) Use a pipette gun to add 20 μL of perfluorosulfonic acid resin (nafion) solution to 980 μL of ethanol, then weigh 10 mg of amorphous cobalt borate nanorods prepared in Example 1 and add them to the solution, ultrasonically disperse for 1 hour , to obtain a homogeneously dispersed solution.

[0050] (2) Take 10 μL of the dispersion prepared in step (1), drop it onto a glassy carbon electrode with a diameter of 1.2 mm, and dry it by using an infrared lamp for 30 minutes. Repeat the dropwise addition three times to prepare an electrode.

[0051] (3) Use the CHI660 electrochemical workstation to test the electrocatalytic water desorption oxygen performance of the electrode prepared in step (2), wherein the counter electrode is a stone mill rod, the reference electrode is a Hg / HgO electrode, and the electrolyte is KOH wi...

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Abstract

The invention belongs to the field of electrocatalytic moisture analysis oxygen, in particular relates to a preparation method and application of an amorphous cobalt borate nanorod efficient oxygen evolution electrocatalyst, and aims to solve the problems of high price and the like of a prior noble metal electrocatalytic oxygen evolution catalyst. Low-cost water-soluble cobalt salt and sodium tetraborate decahydrate are used as precursor reactants; a hydrothermal method is adopted to control the heating temperature and the reaction time; the obtained precipitate are centrifugally washed and freeze-dried to obtain the amorphous cobalt borate nanorod efficient oxygen evolution electrocatalyst. The preparation method has the advantages of low cost, environmental protection, simple operation and convenient post-treatment of the product, the diameter and length of the nanorod can be easily regulated and controled. Meanwhile, the amorphous cobalt borate nanorod efficient oxygen evolution electrocatalyst has the advantages of low initial over potential, low Tafel slope, high stability and the like.

Description

technical field [0001] The invention belongs to the field of electrocatalytic water analysis for oxygen, and in particular relates to a preparation method and application of an amorphous cobalt borate nanorod high-efficiency oxygen analysis electrocatalyst. Background technique [0002] The energy crisis is an important issue facing the sustainable development of modern society, among which electrocatalytic hydrogen evolution and oxygen production is an important way of energy conversion. As for the electrocatalytic hydrogen evolution and oxygen generation, the direct electrolysis of water to produce hydrogen only accounts for 4% of the source of hydrogen energy. Oxygen reactions, respectively, require excellent electrocatalysts to reduce the overpotential for water splitting. At present, the main high-efficiency catalysts still rely on noble metals and their oxides (such as: RuO 2 and IrO 2 ), etc., which are expensive and difficult to be widely used. Therefore, the dev...

Claims

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Application Information

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IPC IPC(8): B01J23/75B01J37/10B82Y30/00B82Y40/00C25B1/04C25B11/04
CPCC25B1/04B82Y30/00B82Y40/00B01J23/75B01J37/10C25B11/069B01J35/33Y02E60/36
Inventor 秦伟周宁芳吴春丁美贾传坤
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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