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Preparation method of Fe2O3/C@Co2B catalyst and application of Fe2O3/C-coated Co2B catalyst in oxygen evolution reaction

A catalyst, fe2o3 technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as danger and long preparation process, so as to improve utilization rate, The process steps are simple and controllable, and the structure is stable

Active Publication Date: 2020-08-11
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process is not only long, but also requires concentrated sulfuric acid and potassium permanganate treatment in the process, which is dangerous

Method used

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  • Preparation method of Fe2O3/C@Co2B catalyst and application of Fe2O3/C-coated Co2B catalyst in oxygen evolution reaction
  • Preparation method of Fe2O3/C@Co2B catalyst and application of Fe2O3/C-coated Co2B catalyst in oxygen evolution reaction
  • Preparation method of Fe2O3/C@Co2B catalyst and application of Fe2O3/C-coated Co2B catalyst in oxygen evolution reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Preparation of Fe 2 o 3 / C carrier:

[0039] In a heat-resistant container, put 20 mmol of FeSO 4 Prepare 1000 mL of 20 mM FeSO by dissolving in deionized water 4 solution as electrolyte;

[0040] Spectrally pure graphite rods were used as the negative and positive electrodes, in which the diameter of the cathode was 28 mm, and the diameter of the anode was 8 mm; the distance between the two graphite rod electrodes was controlled to be 3 cm, and the two electrodes were arranged along the same horizontal line and immersed 3 cm below the solution.

[0041] A current of 60A was applied between the two electrodes, and the voltage was 23 V; the distance between the two electrodes was kept at 2 mm by manual adjustment to ensure the stability of the arc during the discharge process. The duration of each discharge is 3 min, and then the power supply is cut off and the electrolyte is cooled to room temperature, and the above discharge process is repeated 20 times. The c...

Embodiment 2

[0059] (1) Preparation of Fe 2 o 3 / C carrier:

[0060] In a heat-resistant container, put 20 mmol of FeSO 4 Prepare 1000 mL of 20 mM FeSO by dissolving in deionized water 4 solution as electrolyte;

[0061] Spectrally pure graphite rods were used as the negative and positive electrodes, in which the diameter of the cathode was 28 mm, and the diameter of the anode was 8 mm; the distance between the two graphite rod electrodes was controlled to be 3 cm, and the two electrodes were arranged along the same horizontal line and immersed 3 cm below the solution.

[0062] A current of 80A was applied between the two electrodes, and the voltage was 28V; the distance between the two electrodes was kept at 2 mm by manual adjustment to ensure the stability of the arc during the discharge process. The duration of each discharge is 3 min, and then the power supply is cut off and the electrolyte is cooled to room temperature, and the above discharge process is repeated 20 times. The ca...

Embodiment 3

[0064] Embodiment 3: the present embodiment adopts the Fe prepared in embodiment 1 2 o 3 / C carrier material;

[0065] 1 mmol of CoSO 4 ·7H 2 O was formulated into CoSO at a concentration of 0.01 M 4 ·7H 2 O solution, to CoSO 4 ·7H 2 Add 30 mg of Fe to the O solution 2 o 3 / C carrier material and mix well, record as A solution.

[0066] 3 mmol NaBH 4 Dissolve in 0.1 M NaOH solution to make 0.3 M NaBH 4 and 0.1 M NaOH mixed solution, recorded as B solution.

[0067] Then, add liquid B dropwise to liquid A which is being stirred on a magnetic stirrer, and continue stirring for 3 hours after the addition is completed.

[0068] Finally, the resulting precipitate was washed twice with deionized water and absolute ethanol respectively, put into a vacuum drying oven to dry for 6 h, and then the samples were collected to obtain Fe 2 o 3 / C@Co 2 B catalyst.

[0069] The Fe prepared by embodiment 3 2 o 3 / C@Co 2 The microscopic morphology of the B catalyst is a floccu...

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Abstract

The invention discloses a preparation method of a Fe2O3 / C@Co2B catalyst and application of the Fe2O3 / C@Co2B catalyst in an oxygen evolution reaction. According to the invention, Fe2O3 / C is prepared byusing a liquid plasma arc discharge method; The Fe2O3 / C@Co2B catalyst with a core-shell structure is prepared by using a chemical reduction method. After being washed and dried, a catalyst sample isapplied to the process of an electrocatalytic oxygen evolution reaction. Results show that under a current density of 10 mA / cm<2>, the overpotential of the Fe2O3 / C@Co2B catalyst is only 332 mV, a reduction of 33 mV compared with the overpotential (365 mV) of a commercial RuO2 catalyst. Furthermore, the Tafel slopes of Fe2O3 / C@Co2B and RuO2 are 48 mV / dec and 68 mV / dec respectively, so compared withcommercial RuO2, Fe2O3 / C@Co2B has a smaller Tafel slope, which indicates that Fe2O3 / C@Co2B has faster reaction kinetics. Moreover, the stability of Fe2O3 / C@Co2B is obviously improved compared with the stability of Co2B; and Fe2O3 / C@Co2B can stably catalyze water electrolysis for 12 hours without obvious reduction, and the overpotential of Fe2O3 / C@Co2B is not obviously increased after 2000 CV cycles.

Description

[0001] The present invention relates to a kind of Fe 2 o 3 / C@Co 2 The preparation of B novel boride catalyst and its application in oxygen evolution reaction belong to the technical field of catalyst preparation and application. Background technique [0002] As a renewable energy, hydrogen energy has the characteristics of high energy density, no pollution and abundant resources, so it has received extensive attention and has broad application prospects. Hydrogen production by electrolysis of water, as a new technology, can convert electrical energy into stable chemical energy, providing a sustainable solution. However, the four-electron transfer process of the oxygen evolution reaction (OER) at the anode consumes a large amount of energy in the process of hydrogen production by electrolysis of water, which severely limits the further development of hydrogen production by electrolysis of water. Studies have found that adding a catalyst during the reaction can significantly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J35/10C25B1/04C25B11/06
CPCB01J23/75C25B1/04C25B11/091B01J35/33B01J35/61Y02E60/36
Inventor 闫晓丽张华章海霞刘培植郭俊杰
Owner TAIYUAN UNIV OF TECH
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