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fe 2 o 3 /c@co 2 The preparation method of b catalyst and its application in oxygen evolution reaction

A catalyst, fe2o3 technology, used in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of danger, long preparation process, etc. The process steps are simple and controllable, and the effect of improving the specific surface area

Active Publication Date: 2021-03-12
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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  • fe <sub>2</sub> o <sub>3</sub> /c@co <sub>2</sub> The preparation method of b catalyst and its application in oxygen evolution reaction
  • fe <sub>2</sub> o <sub>3</sub> /c@co <sub>2</sub> The preparation method of b catalyst and its application in oxygen evolution reaction
  • fe <sub>2</sub> o <sub>3</sub> /c@co <sub>2</sub> The preparation method of b catalyst and its application 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 liquid.

[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 floccule...

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Abstract

Fe 2 O 3 / C@Co 2 Preparation method of B catalyst and its application in oxygen evolution reaction, Fe is prepared by liquid plasma arc discharge method 2 O 3 / C. Fe with core-shell structure was prepared using chemical reduction method 2 O 3 / C@Co 2 B catalyst. After the catalyst sample is washed and dried, it is used in the electrocatalytic oxygen evolution reaction process. The results show that at 10 mA / cm 2 At the current density of Fe 2 O 3 / C@Co 2 The overpotential of B catalyst is only 332 mV, which is higher than that of commercial RuO 2 The overpotential of the catalyst (365 mV) dropped by 33 mV. In addition, Fe 2 O 3 / C@Co 2 B and RuO 2 The Tafel slopes are 48 mV / dec and 68 mV / dec respectively, Fe 2 O 3 / C@Co 2 B relative to commercial RuO 2 has a smaller Tafel slope, indicating that Fe 2 O 3 / C@Co 2 B has faster reaction kinetics. Furthermore, Fe 2 O 3 / C@Co 2 The stability of B and Co 2 Compared with B, it has also been significantly improved. It can stably catalyze water electrolysis for 12 hours without significant decrease. After 2000 CV cycles, the overpotential does not increase significantly.

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 Patents(China)
IPC IPC(8): B01J23/75B01J35/10C25B1/04C25B11/091
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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