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Silicon-doped iron-nitrogen/carbon composite catalyst as well as preparation method and application thereof

A catalyst, silicon doping technology, applied in nanotechnology for materials and surface science, electrical components, battery electrodes, etc., to achieve the effect of simple and easy method, improved service life, and high methanol resistance

Active Publication Date: 2020-10-30
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mesoporous SiO 2 Preparation of Si-doped Fe-N / C composites as templates for oxygen reduction catalysts has not been reported yet

Method used

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  • Silicon-doped iron-nitrogen/carbon composite catalyst as well as preparation method and application thereof
  • Silicon-doped iron-nitrogen/carbon composite catalyst as well as preparation method and application thereof
  • Silicon-doped iron-nitrogen/carbon composite catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] In this embodiment, a method for preparing a silicon-doped iron-nitrogen / carbon composite catalyst comprises the following steps:

[0043] a. Using cetyltrimethylammonium bromide (CTAB) template to synthesize mesoporous silica silica spheres, the synthesis method is as follows:

[0044] Under stirring conditions, 1.0 g of cetyltrimethylammonium bromide was dissolved in 160 mL of deionized water, and 7.0 mL of concentrated ammonia water with a concentration of 15% by mass was added dropwise to form a transparent solution; Add the mixed solution of ethyl orthosilicate and 20mL of n-hexane dropwise into the above transparent solution; through the reaction, at 35°C and at a speed of 200rpm, the mixed solution gradually becomes a milky white colloidal solution; keep stirring for 12h After cooling down to room temperature, the product was collected by centrifugation, and the collected product was washed with deionized water and ethanol; then the collected product was dried at...

Embodiment 2

[0060] This embodiment is basically the same as Embodiment 1, especially in that:

[0061] In this embodiment, a method for preparing a silicon-doped iron-nitrogen / carbon composite catalyst comprises the following steps:

[0062] a. Using cetyltrimethylammonium bromide (CTAB) template to synthesize mesoporous silica silica spheres, the synthesis method is as follows:

[0063] Under stirring conditions, 1.0 g of cetyltrimethylammonium bromide was dissolved in 160 mL of deionized water, and 4.0 mL of concentrated ammonia water with a concentration of 15% by mass was added dropwise to form a transparent solution; Add the mixed solution of ethyl orthosilicate and 30mL of n-hexane dropwise into the above transparent solution; through the reaction, at 35°C and at a speed of 200rpm, the mixed solution gradually turns into a milky white colloidal solution; keep stirring for 12h After cooling down to room temperature, the product was collected by centrifugation, and the collected prod...

Embodiment 3

[0069] This embodiment is basically the same as the previous embodiment, and the special features are:

[0070] In this embodiment, a method for preparing a silicon-doped iron-nitrogen / carbon composite catalyst comprises the following steps:

[0071] a. This step is the same as in Embodiment 1;

[0072] b. This step is the same as in Embodiment 1.

[0073] In this example, the application of a silicon-doped iron-nitrogen / carbon composite catalyst, the preparation method of the silicon-doped iron-nitrogen / carbon composite catalyst described in this example is used to prepare the silicon-doped iron-nitrogen / carbon composite catalyst to prepare the catalyst Suspension, the preparation method of the catalyst suspension is as follows: use the silicon-doped iron-nitrogen / carbon composite catalyst as the oxygen reduction catalyst material, take 5mg of silicon-doped iron-nitrogen / carbon composite catalyst, add 10mL ethanol and 10 μL concentration 5wt% Nafion solution, mixed, and ult...

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Abstract

The invention discloses a silicon-doped iron-nitrogen / carbon composite catalyst as well as a preparation method and application thereof. Mesoporous silicon dioxide spheres are adopted as a template, different types of iron precursors and pyrrole are adopted as raw materials, gas-phase polymerization is performed in pyrrole steam to obtain a Fe / mSiO2@PPY composite material, and then high-temperature roasting hydrofluoric acid treatment is performed to obtain Si-doped iron nitrogen / carbon (Si-FeNx / C). According to the invention, Si-doped iron nitrogen / carbon is used as a cathode material of thefuel cell, and the oxygen reduction catalyst with excellent performance is constructed. The Si-doped iron-nitrogen / carbon catalyst prepared by the method has catalytic activity superior to that of commercial Pt / C under an alkaline condition and has the advantages of high stability and tolerance to methanol.

Description

technical field [0001] The invention relates to a preparation method of an oxygen reduction catalyst, in particular to a preparation method of a low-cost, high-activity and high-stability non-platinum oxygen reduction catalyst, which is of great significance for commercialization of fuel cells. Background technique [0002] Nowadays, with the rapid development of economy, the scale of global population and economy is constantly expanding, and the human demand for energy is increasing day by day. As our main energy source, fossil fuels are becoming increasingly depleted due to their excessive use, and the combustion of fossil fuels produces gases such as CO 2 , SO 2 , NO x Toxic and harmful gases and inhalable particles, and these pollutants seriously endanger people's health and have a strong negative impact on the global ecological environment. therefore. Developing renewable and clean energy and improving energy utilization is the most important direction to solve the ...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M4/88B82Y30/00
CPCH01M4/9083H01M4/88H01M4/8828B82Y30/00Y02E60/50
Inventor 王怡然董俊萍赵宏滨徐甲强
Owner SHANGHAI UNIV
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