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
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[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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