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Carbon-based Fe/S/N co-doped oxygen reduction catalyst as well as preparation method and application thereof

A catalyst and co-doping technology, applied in the preparation/purification of carbon, fuel cell type half-cell and primary cell type half-cell, electrical components, etc., can solve problems such as limited catalytic activity

Active Publication Date: 2021-11-16
SHANDONG ENERGY GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalytic activity of pure carbon materials is very limited, so many researchers have made considerable modifications and modifications to them.

Method used

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  • Carbon-based Fe/S/N co-doped oxygen reduction catalyst as well as preparation method and application thereof
  • Carbon-based Fe/S/N co-doped oxygen reduction catalyst as well as preparation method and application thereof
  • Carbon-based Fe/S/N co-doped oxygen reduction catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Preparation of iron porphyrin-based cross-linked microporous polymer: Take 211.2 mg (0.3 mmol) of 5,10,15,20-tetraphenyliron porphyrin and 292.5 mg (1.8 mmol) of anhydrous ferric chloride in a dry in the flask. After the flask was sealed and vacuumed, nitrogen was introduced three times. Then, 160 μL (1.8 mmol) of dimethanol formal and 8 mL of dehydrated dichloroethane were added, and the reaction was stirred and refluxed at 80°C for 27 hours under a nitrogen atmosphere. After the reaction, the solid-liquid mixture was suction-filtered, washed with dichloroethane, methanol, water, and methanol in sequence, and then extracted with methanol in a Soxhlet extractor for 24 hours. After drying, an iron porphyrin-based cross-linked microporous polymer is obtained.

[0053] Preparation of iron porphyrin-based cross-linked microporous polymer doped with polythiophene: take 100 mg of iron porphyrin-based cross-linked micro-porous polymer and 200 mg (2.38 mmol) thiophene in 80 mL...

Embodiment 2

[0058] Preparation of oxygen reduction working electrode: Disperse 5 mg of the above-mentioned synthesized sample in 800 microliters of Nafion isopropanol solution with a volume fraction of 3%, and disperse the material evenly by ultrasonic waves. Take 10 microliters drop by drop in a dry rotating Disc electrode (diameter 5mm), after natural drying, test the electrochemical catalytic performance of the sample.

[0059] image 3 It is the cyclic voltammetry curve of the oxygen reduction catalyst obtained in this embodiment, in saturated N 2 Under the 0.1M KOH electrolyte solution, the cyclic voltammogram in the voltage range of 0.2-1.0V is similar to a rectangle, and there is no obvious reduction peak. Relatively speaking, at saturation O 2 Under the 0.1M KOH electrolyte solution, there is an obvious characteristic peak of oxygen reduction reaction (ORR), indicating that this material has significant electrocatalytic activity for oxygen reduction reaction, and its reduction p...

Embodiment 3

[0061] Preparation of air electrode: 5% Nafion solution, ultrapure water and ethanol are mixed according to the volume ratio of 3:30:70 to obtain a mixed solution, and the oxygen reduction catalyst prepared above is ultrasonically dispersed into the mixed solution, and then sprayed on carbon paper or carbon cloth On the electrode, dry to obtain an air electrode, and the loading of the catalyst is 1mg / cm 2 . For comparison, an air electrode was fabricated using the same procedure with 20wt% commercial platinum carbon as a catalyst. A zinc-air fuel cell is formed by using the fabricated air electrode as the cathode, zinc sheet as the anode, and 6M KOH solution as the electrolyte. The open circuit voltage and polarization curve of the battery are obtained by testing at normal temperature and pressure.

[0062] Figure 6 The open circuit voltage of the zinc-air fuel cell produced for this example shows that the open circuit voltage of the single cell is 1.48V, which is greater t...

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Abstract

The invention provides a preparation method of a carbon-based Fe / S / N co-doped oxygen reduction catalyst, and the method comprises the following steps: S1) copolymerizing phenyl ferriporphyrin and a cross-linking agent under the action of a catalyst to obtain a ferriporphyrin-based cross-linked microporous polymer; S2) mixing the ferriporphyrin-based cross-linked microporous polymer with thiophene for adsorption, and then performing polymerization under the action of an initiator to obtain a polythiophene coated ferriporphyrin cross-linked microporous polymer composite structure; S3) carrying out carbonization treatment on the composite structure obtained in the step S2) to obtain the carbon-based Fe / S / N co-doped oxygen reduction catalyst. The oxygen reduction catalyst shows efficient oxygen reduction electrochemical performance and stability, the half-wave potential of the oxygen reduction electrochemical reaction is (0.89 Vvs.RHE), and the oxygen reduction catalyst is superior to commercial platinum carbon; the maximum output power of the zinc-air battery is 106mW / cm<2>, which is superior to that of 20wt% commercial platinum carbon.

Description

technical field [0001] The invention relates to the technical field of energy materials, in particular to a carbon-based Fe / S / N co-doped oxygen reduction catalyst and its preparation method and application. Background technique [0002] At present, fossil energy led by coal, oil, and natural gas is still the main energy consumed by human beings. The progress of fossil energy and the global warming and climate change caused by the use of fossil energy are also attracting widespread attention. Therefore, the research and development of sustainable clean energy storage and conversion technology has become the key to the world today. The current renewable energy mainly includes solar energy, wind energy, water energy, biomass energy, geothermal energy and so on. In the development and utilization of these energy sources, there are disadvantages such as limited geographical use, difficulty in large-scale utilization, discontinuous energy supply, and low energy density. However...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90H01M12/06C01B32/05
CPCH01M4/88H01M4/9041H01M4/9083H01M12/06C01B32/05Y02E60/50
Inventor 肖作旭陈艳丽邢涛李智闫伟刘海燕
Owner SHANDONG ENERGY GRP
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