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MnO2 nanosheet modified mesoporous ZSM-5 ORR (oxygen reduction reaction) catalyst and preparation method thereof

A ZSM-5, catalyst technology, applied in the field of oxygen reduction reaction electrode catalyst and its preparation, can solve the problems of unsuitability for large-scale commercial application, high price of ORR catalyst, etc., and achieves excellent anti-methanol catalytic oxidation performance, low cost, Easy to operate effect

Inactive Publication Date: 2016-08-24
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to overcome the defects that existing ORR catalysts are expensive and unsuitable for large-scale commercial application, and provide a non-precious metal MnO that can be used as an ORR catalyst in polymer membrane fuel cells. 2 Nanosheet-modified mesoporous ZSM-5 composite electrode catalyst material and preparation method thereof

Method used

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  • MnO2 nanosheet modified mesoporous ZSM-5 ORR (oxygen reduction reaction) catalyst and preparation method thereof
  • MnO2 nanosheet modified mesoporous ZSM-5 ORR (oxygen reduction reaction) catalyst and preparation method thereof
  • MnO2 nanosheet modified mesoporous ZSM-5 ORR (oxygen reduction reaction) catalyst and preparation method thereof

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Embodiment 1

[0045] According to the above-mentioned technical scheme and process flow of the present invention, firstly, a mesoporous ZSM-5 zeolite precursor material is prepared. Weigh 0.6132g aluminum isopropoxide and 31.248g ethyl silicate and mix and add 90g water and stir evenly at room temperature, then add dropwise 21.96g tetrapropylammonium hydroxide (TPAOH, 25wt%), 0.54g NaOH and 90g water The mixed solution was stirred at 40°C for 3h and then transferred to an oil bath at 100°C to continue stirring for 2 days. The above reaction was carried out in a 500ml Duran bottle with good sealing performance. The above suspension was filtered by suction, and the obtained powder was dried in an oven at 100°C to obtain mesoporous ZSM-5 zeolite;

[0046] After taking 0.5g of the above-mentioned zeolite molecular sieve powder and pulverizing it, add 100ml of water and 60g of ethanol to the mixed solution for ultrasonic dispersion, and then slowly drop into 30ml of ethanol solution in which 0.2...

Embodiment 2

[0049] According to technological process described (same as embodiment 1), take by weighing 0.3066g aluminum isopropoxide and 15.624g ethyl silicate mix and add 25g water to prepare hierarchical porous (mesoporous) ZSM-5 zeolite, other operations are implemented with example 1. Then drop 10 mL of Mn(NO 3 ) 2 After stirring the aqueous solution for 2 hours, slowly drop 10 mL of NaOH solution with a concentration of 1.2 mol / L, and continue stirring at room temperature for 12 hours. Electrostatically attracts MnO 2 (OH) - The resulting powder was calcined in a muffle furnace at 550°C for 7 hours to obtain 2wt% MnO 2 / Mesoporous ZSM-5 composite material; the composite material has an ellipsoidal shape and a size of ~350nm, such as figure 2 shown;

[0050] Among them, MnO 2 The content measurement method is inductively coupled plasma atomic emission spectrometer (ICP-OES). MnO was detected by transmission electron microscope (TEM) and high power transmission electron micr...

Embodiment 3

[0052] According to technological process described (same as embodiment 1), take by weighing 0.3066g aluminum isopropoxide and 15.624g ethyl silicate mix and add 25g water to prepare hierarchical porous (mesoporous) ZSM-5 zeolite, other operations are implemented with Example 1, and MnO is electrostatically attracted to 2 (OH) - The resulting powder was calcined in a muffle furnace at 550°C for 7 hours to obtain 3.9wt% MnO 2 / mesoporous ZSM-5 composite material; the specific surface area of ​​the composite material is 380m 2 / g, the shape is an irregular ellipsoid, the size is ~300nm, and the pore size is 10~50nm, such as image 3 In B and C ( image 3 Shown in the SEM photo of the enlarged view of the box in B in B); and the material is in O 2 The saturated 0.1M KOH electrolyte exhibits an obvious oxygen reduction current peak, as shown in Figure 6 shown.

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Abstract

The invention relates to a MnO2 nanosheet modified mesoporous ZSM-5 ORR (oxygen reduction reaction) catalyst and a preparation method thereof. The catalyst material comprises mesoporous ZSM-5 and MnO2 nanosheets generated on the inner and outer surfaces of a pore passage of the mesoporous ZSM-5 in situ; the weight percentage content of the MnO2 nanosheets is 2 to 5 weight percent of the catalyst material. The invention provides a non-noble metal ORR catalyst, and a MnO2 nanosheet modified mesoporous ZSM-5 composite material. Surface modification and electrostatic attraction methods are adopted, so that the MnO2 nanosheets are uniformly grown on the inner and outer surfaces of the pore passage of mesoporous ZSM-5 zeolite, and the MnO2 / mesoporous ZSM-5 composite material is prepared; the preparation method is simple; the condition is mild; the operation is easy.

Description

technical field [0001] The invention relates to a non-noble metal Pt polymer membrane fuel cell oxygen reduction reaction electrode catalyst and a preparation method thereof, in particular to a MnO 2 Nanosheet-modified mesoporous ZSM-5 oxygen reduction reaction electrode catalyst and its preparation method. Background technique [0002] Polymer membrane fuel cells (PMFCs), as a new generation of green power generation devices, have the characteristics of low start-up temperature (<100°C), high efficiency, clean and pollution-free, and are considered to be one of the clean energy sources that will be developed in the 21st century. one. It has broad application prospects in the fields of fixed power stations, household power supplies, and mobile power supplies such as vehicles. However, the oxygen reduction reaction (ORR) at the cathode is a slow reaction and becomes the rate-determining step of the entire battery reaction. Although, the Pt catalyst has high catalytic ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/48H01M4/90
CPCB01J29/48H01M4/9075Y02E60/50
Inventor 崔香枝施剑林
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI