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Monatomic iron-nitrogen co-doped carbon electrocatalyst as well as preparation method and application thereof

An electrocatalyst and co-doping technology, applied in the direction of circuits, electrical components, battery electrodes, etc., can solve the problems of insufficient activity, poor chimera effect, low catalyst selectivity, etc., and achieve high selectivity, low overpotential, The effect of high specific surface area

Inactive Publication Date: 2020-07-31
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalyst prepared by the ball milling method has a poor chimera effect between the iron single atom and the metal organic framework, and the selectivity of the catalyst is not high, and the activity is insufficient.

Method used

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  • Monatomic iron-nitrogen co-doped carbon electrocatalyst as well as preparation method and application thereof
  • Monatomic iron-nitrogen co-doped carbon electrocatalyst as well as preparation method and application thereof
  • Monatomic iron-nitrogen co-doped carbon electrocatalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) 32mmol of 2-methylimidazole and 24mg of iron phthalocyanine (FePc) were added to 40mL of methanol, and stirred magnetically for 10min to uniformly mix to obtain a mixed solution; 4mmol of zinc nitrate hexahydrate (Zn(NO) 3 ) 2 ·6H 2 0) join in 40mL methanol, magnetic stirring 10min to mix uniformly, obtain the methanol solution of zinc nitrate;

[0045] (2) The methanol solution of zinc nitrate was added to the mixed solution, and after magnetic stirring at room temperature for 24 h, centrifuged and washed three times with methanol and deionized water, respectively, and vacuum dried at 70 °C for 12 h to obtain the metal organic framework ZIF-8 package. The iron phthalocyanine composite material;

[0046] (3) The prepared composite material was calcined at 1000 °C under nitrogen atmosphere, and the heating rate was 5 °C min -1 , the calcination time was 3 h, and the calcined product was a single-atom iron-nitrogen co-doped carbon electrocatalyst containing iron ox...

Embodiment 2-4

[0050] According to the preparation method of Example 1, the calcination temperature in step (3) was changed to 700° C., 800° C. and 900° C., respectively, and the remaining steps remained unchanged. The BET specific surface area of ​​the obtained catalyst was 469 m, respectively. 2 g -1 , 693m 2 g -1 and 775m 2 g -1 , the pore volume is 0.36cm, respectively 3 g -1 , 0.50cm 3 g -1 and 0.69cm 3 g -1 , the pore size distribution is the same as that of the catalyst in Example 1, including micropores with pore diameters below 3 nm, mesopores with 3-5 nm and 29-32 nm.

Embodiment 5-7

[0052] According to the preparation method of Example 1, the addition amount of iron phthalocyanine in step (1) was changed to 8 mg, 16 mg and 48 mg respectively, and the remaining steps remained unchanged.

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Abstract

The invention relates to the technical field of electrocatalysts. The invention discloses a monatomic iron-nitrogen co-doped carbon electrocatalyst as well as a preparation method and application thereof. Iron in the catalyst is wrapped in pores of a metal organic framework ZIF-8 containing a micropore and / or mesoporous structure in a monatomic iron-nitrogen coordination form, and the catalyst comprises micropores with pore diameters lower than 3nm, mesopores with pore diameters of 3-5nm and mesopores with pore diameters of 29-32nm. The preparation method of the vcomprises: (1) adding iron phthalocyanine into a 2-methylimidazole solution; (2) adding a zinc nitrate solution, and mixing to obtain a ZIF-8 packaged iron phthalocyanine composite material; and (3) calcining and pickling the composite material to obtain the electrocatalyst. The macroscopic morphology of the catalyst is a regular dodecahedron, the catalyst is regular and good in repeatability, and when the catalyst is applied,an electrolyte can achieve mass transfer through rich mesoporous structures in the catalyst, and high selectivity, high activity and low overpotential of CO preparation through electro-catalysis of CO<2> are achieved.

Description

technical field [0001] The invention relates to the technical field of electrocatalysts, in particular to a single-atom iron-nitrogen co-doped carbon electrocatalyst and a preparation method and application thereof. Background technique [0002] Traditional biological and chemical wastewater treatment technologies mainly oxidize organic pollutants in wastewater to CO 2 Emissions not only waste the chemical energy stored in wastewater, but also emit a lot of greenhouse gases. Bioelectrochemical system is one of the most promising technologies dedicated to converting chemical energy in wastewater into electrical energy in recent years. It is widely used in wastewater treatment, and its anode produces active bacteria to oxidize organic matter to generate CO. 2 A specific reduction reaction occurs at the cathode. [0003] Among many reduction reactions, electrocatalytic CO 2 The reduction reaction can convert the CO generated from wastewater treatment 2 Reduction and convers...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90H01M8/16
CPCH01M4/8878H01M4/8885H01M4/9041H01M4/9083H01M8/16Y02E60/50
Inventor 侯阳曾奇李中坚杨彬雷乐成
Owner ZHEJIANG UNIV
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