Noble-metal/vertical-grown layered-double-hydroxide (LDH) nanosheets for methanol fuel-cell catalyst and preparation method of noble-metal/vertical-grown LDH nanosheets

A technology of hydrotalcite and nanosheets, which is applied in the direction of fuel cells, battery electrodes, circuits, etc., can solve the problems of reducing the cost of use, achieve the effects of reducing the cost of use, increasing the service life, and enhancing the anti-CO toxicity

Active Publication Date: 2017-05-31
QINGDAO UNIV
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Problems solved by technology

[0006] In order to overcome the shortcoming of the preparation method of methanol fuel cell catalyst in the prior art, the first object of the present invention is to provide a kind of preparation method of noble metal / vertical growth hydrotalcite nanosheet, this preparation method is simple and easy to operate, is superior to The operation steps of the methanol fuel cell catalyst in the prior art, while the precious metal salt solution can be reused, which greatly reduces the cost of use

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  • Noble-metal/vertical-grown layered-double-hydroxide (LDH) nanosheets for methanol fuel-cell catalyst and preparation method of noble-metal/vertical-grown LDH nanosheets
  • Noble-metal/vertical-grown layered-double-hydroxide (LDH) nanosheets for methanol fuel-cell catalyst and preparation method of noble-metal/vertical-grown LDH nanosheets
  • Noble-metal/vertical-grown layered-double-hydroxide (LDH) nanosheets for methanol fuel-cell catalyst and preparation method of noble-metal/vertical-grown LDH nanosheets

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preparation example Construction

[0050] As introduced in the background technology, methanol fuel cell catalysts in the prior art have problems such as the intermediate product CO is easy to adsorb on the surface of noble metals, the noble metal catalysts are prone to aggregation, and the preparation method of the catalyst is complicated. In order to solve the above technical problems, the present invention proposes A preparation method of noble metal / vertically growing hydrotalcite nanosheets, comprising the following steps:

[0051] (1) After cleaning the template required for hydrotalcite (LDH) growth, etch it, and clean it after etching;

[0052] (2) Using a mixed solution of methanol and water as a solvent to dissolve two or three precursor metal salts and cetyltrimethylammonium bromide (CTAB) required for hydrotalcite growth to form a homogeneous solution;

[0053] (3) Put the template cleaned in step (1) into the homogeneous solution in step (2), and carry out hydrothermal reaction; after the reaction ...

Embodiment 1

[0063] A preparation method of a noble metal / vertically grown hydrotalcite nanosheet methanol fuel cell catalyst figure 1 , the detailed preparation steps are as follows: First, cut the carbon fiber cloth (CFP) into 0.5×3cm, wash it with 250mL acetone solution five times, remove the oil attached to the surface, and use 0.5mol. L -1 After etching with hydrochloric acid for 15 minutes, wash with absolute ethanol and secondary water for 6 times. Then weigh Ni(NO 3 ) 2 ﹒ 6H 2 O(0.2mL 0.2M) and Co(NO 3 ) 2 ﹒ 6H 2 O (0.04mL0.2M), 1.5g of CTAB was added, and a mixed solution of 60mL methanol and 12mL deionized water (volume ratio: 5:1) was used as a solvent to dissolve and form a uniform solution. The above solution and LDH template were transferred to a 100mL reactor, reacted at 200°C for 24h, cooled down naturally, and cleaned the surface with ethanol and secondary water. Transfer to a vacuum drying oven and dry at 55°C for 4h, and vertically grown NiCo LDH nanosheets wer...

Embodiment 2

[0067] A kind of preparation method of noble metal / vertical growth hydrotalcite nano sheet methanol fuel cell catalyst, first cut the carbon fiber cloth nickel foam (NF) into 0.5 * 3cm, wash with 200mL acetone solution in four times, remove the oil stain on the surface, use 2.0 mol L -1 After etching with hydrochloric acid for 20 minutes, wash with absolute ethanol and secondary water for 6 times. Then weigh (CH 3 COO) 2 Ni. 4H 2 O(0.2mL,0.2M) and Fe(NO 3 ) 3 ﹒ 9H 2 O (0.6mL, 0.2M), add 3g of cetyltrimethylammonium bromide (CTAB), dissolve with the mixed solution of 48mL methanol and 12mL deionized water (volume ratio: 4:1) as solvent and A homogeneous solution was formed. The above solution and LDH template were transferred to a 100mL reactor, reacted at 180°C for 12h, cooled down naturally, and cleaned the surface with ethanol and secondary water. Transfer to a vacuum drying oven and dry at 40°C for 6h, and vertically grown NiFe LDH nanosheets were obtained after d...

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Abstract

The invention discloses noble-metal / vertical-grown layered-double-hydroxide (LDH) nanosheets for a methanol fuel-cell catalyst and a preparation method of the noble-metal / vertical-grown LDH nanosheets. The method comprises the steps: firstly, washing a template required for LDH growth, and then, carrying out etching; then, putting the template material into a mixed solution of two or three precursor metal salts required for LDH growth by using a hydrothermal reaction, adding a certain mass of cetyl trimethyl ammonium bromide (CTAB) into the solution, carrying out a reaction at a certain temperature, and then, carrying out cooling, so as to obtain LDH nanosheets which are vertically grown on the surface of the template material; finally, placing the obtained vertically-grown LDH nanosheets into a solution of one or more noble metal salts, of which the pH is adjusted to be in a certain range, and carrying out a redox reaction, thereby obtaining the noble-metal / vertical-grown LDH nanosheets. According to the noble metal support prepared by using the method disclosed by the invention, the LDH nanosheets are vertically grown on the surface of the template material, so that a larger specific surface area is provided for the loading of a noble metal catalyst, and LDH grown on the template material has a better rigid structure.

Description

technical field [0001] The invention belongs to the field of composite catalyst preparation, in particular to a preparation method of a noble metal / vertical growth hydrotalcite nanosheet methanol fuel cell catalyst. Background technique [0002] Today, with the improvement of productivity and human living standards, the demand and dependence on energy are increasing rapidly, which makes the consumption of traditional fossil fuels increase day by day, followed by the destruction of the living environment. Therefore, it is urgent to find a renewable alternative energy source to reduce the burning of fossil fuels and relieve the pressure on the environment. As a portable new energy source, methanol fuel cell is not limited by the Carnot cycle because it can directly convert chemical energy into electrical energy, and the energy conversion rate can reach more than 80%, which has the advantage of high energy density and does not require traditional The cumbersome charging and di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/90H01M8/1011
CPCH01M4/88H01M4/9075H01M8/1011Y02E60/50
Inventor 张菲菲王宗花王桢玉薛浩男夏建飞
Owner QINGDAO UNIV
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