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Electrolyzed water reaction device with externally applied magnetic field and method for improving electrocatalytic properties

A technology of applying an external magnetic field and a reaction device, applied in the electrolysis process, electrolysis components, electrodes, etc., can solve the problems of oxygen evolution and hydrogen evolution performance that are not involved in the field of electrolysis water, and achieve the effect of improving performance and improving catalytic performance.

Active Publication Date: 2019-04-09
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, in the field of photocatalysis, an external magnetic field has been used to change the α-Fe 2 o 3 / rGO photocatalyst electron spin state, thus effectively improving the ability of its photocatalyst to degrade organic matter (Li J, Pei Q and et al, ACS Nano, 2018, 12, 3351-3359), but the method is to use the magnetic field to enhance Photocatalytic properties, no electrocatalytic properties involved
In addition, there are also Co 3 o 4 / ECNFs as a cathode catalyst accelerates the four-electron transfer step in the oxygen reduction process with the help of a magnetic field (Zeng Z, ChemSusChem, 2018, 11, 580-588), but the magnetic field used in this method is provided by the Helmholtz coil, which can only Provide a small magnetic field, and only confirm the influence of the magnetic field on the electron transfer process, and it is aimed at the oxygen reduction process in the field of fuel cells, but does not involve the oxygen evolution and hydrogen evolution performance in the field of electrolysis of water

Method used

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  • Electrolyzed water reaction device with externally applied magnetic field and method for improving electrocatalytic properties
  • Electrolyzed water reaction device with externally applied magnetic field and method for improving electrocatalytic properties
  • Electrolyzed water reaction device with externally applied magnetic field and method for improving electrocatalytic properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A layer of cobalt-containing precursor material was grown on the foamed Ni by the hydrothermal method, and then heat-treated at 400 °C in an air atmosphere for 4 hours, and finally the Co grown directly on the foamed Ni was obtained. 3 o 4 catalyst. The surface will be grown with Co 3 o 4 The Ni foam of the catalyst was used as the working electrode, and the CHI 760E electrochemical workstation was used to characterize the oxygen evolution performance of the catalyst in electrolysis of water, which was carried out in a three-electrode system electrolyzer at room temperature. Among them, the electrolyte is 1M KOH solution, the counter electrode is Pt sheet, and the reference electrode is Ag / AgCl electrode. The electrochemical behavior is mainly analyzed using linear sweep voltammetry (LSV) curves and Tafel curves, and the scanning speed of LSV is always set to 5mV / s.

[0053] First test the Co when there is no external magnetic field 3 o 4 The LSV curve of the oxyg...

Embodiment 2

[0056] A layer of precursor material containing nickel and cobalt was grown on foamed Cu by hydrothermal method, and then it was heat-treated in a muffle furnace at 400°C for 3 hours to make NiCo 2 o 4 The catalysts are directly grown on foamed Cu. The surface will be grown with Co 3 o 4 The foam Cu of the catalyst was used as the working electrode, and the CHI 760E electrochemical workstation was used to characterize the oxygen evolution performance of the catalyst in electrolysis of water, which was carried out in a three-electrode system electrolyzer at room temperature. Among them, the electrolyte is 1M KOH solution, the counter electrode is Pt sheet, and the reference electrode is Ag / AgCl electrode. The electrochemical behavior is mainly analyzed using linear sweep voltammetry (LSV) curves and Tafel curves, and the scanning speed of LSV is always set to 5mV / s.

[0057] First test the NiCo when the magnetic field strength is 0 2 o 4 The LSV curve of the oxygen evolut...

Embodiment 3

[0062] NiCo 2 o 4 The catalyst powder was mixed with anhydrous ethanol and naphthol solvents and coated on the glassy carbon electrode to form a working electrode. The CHI 760E electrochemical workstation was used to characterize the oxygen evolution performance of the catalyst in electrolysis of water at room temperature in a three-electrode system electrolytic cell. Among them, the electrolyte is 1M KOH solution, the counter electrode is Pt sheet, and the reference electrode is Ag / AgCl electrode. The electrochemical behavior is mainly analyzed using linear sweep voltammetry (LSV) curves and Tafel curves, and the scanning speed of LSV is always set to 5mV / s.

[0063] Test NiCo first 2 o 4 The LSV curve of the oxygen evolution catalyst when the magnetic field strength is 0, and the catalytic performance without a magnetic field is obtained. After the test, adjust the strength of the applied magnetic field to 100mT and keep it constant, and then drive the rotation of the el...

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Abstract

The invention discloses an electrolyzed water reaction device with an externally applied magnetic field and a method for improving electrocatalytic properties and belongs to the new energy technical fields of electrolyzed water catalysis and electrolyzed water hydrogen preparation. A base is arranged below an electrolytic tank; the base is provided with a permanent magnet base A, a permanent magnet base B, a supporting disk and a rotating disk; and the movement of the permanent magnet base B is controlled by a screw placed in the base, and meanwhile, the rotating disk is rotated to regulate anincluded angle of a working electrode in the electrolytic tank arranged on the rotating disk and the magnetic field, so that the direction of the magnetic field is controlled; in addition, the electrocatalytic properties are represented by measuring the overpotential and tafel slope of an oxygen and hydrogen evolution reaction of electrolyzed water by an electrochemical workstation. By using theelectrolyzed water reaction device, the catalytic properties of a catalyst in a water electrolysis process is improved by utilizing the externally applied magnetic field, meanwhile, complex material preparation processes such as structural regulation and control, morphological construction and interfacial optimization are avoided, and the aims of effectively saving energy and stably working for along time are achieved.

Description

technical field [0001] The invention belongs to the new energy technology field of electrolysis of water catalysis and hydrogen production by electrolysis of water, and in particular relates to an electrolysis water reaction device with an external magnetic field and a method for enhancing electrocatalysis performance. Background technique [0002] The aggravation of environmental pollution and the reduction of fossil fuels have made human beings face serious resource, environmental and energy crises. The development of various new and renewable energy sources has always been a matter of great importance to all countries in the world. Among them, hydrogen energy is recognized as one of the most potential renewable new energy sources due to its advantages of wide source of raw material hydrogen, clean and pollution-free, and high energy density. Existing hydrogen production technologies mainly include fossil fuel hydrogen production, nuclear energy hydrogen production, water...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25B9/00C25B11/06
CPCC25B1/04C25B9/00C25B11/077Y02E60/36
Inventor 彭坤李依依张磊
Owner HUNAN UNIV
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