Oxygen evolution catalyst, preparation method thereof and anode for water electrolysis

A catalyst and oxygen evolution technology, which is applied in the field of electrochemistry, can solve the problems of high cost and complicated preparation process, and achieve the effects of reducing preparation cost, simplifying the preparation process, and low oxygen evolution overpotential

Inactive Publication Date: 2019-05-03
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide an oxygen evolution catalyst and its preparation method and electrolyzed water anode, aiming to solve the technical problems of complex preparation process and high cost of the existing foam nickel-supported oxygen evolution catalyst

Method used

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  • Oxygen evolution catalyst, preparation method thereof and anode for water electrolysis
  • Oxygen evolution catalyst, preparation method thereof and anode for water electrolysis
  • Oxygen evolution catalyst, preparation method thereof and anode for water electrolysis

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preparation example Construction

[0019] On the one hand, an embodiment of the present invention provides a method for preparing an oxygen evolution catalyst, comprising the following steps:

[0020] S01: Provide nickel foam;

[0021] S02: placing the foamed nickel in a ferrous salt solution for mixing treatment, then adding a bicarbonate solution, and performing an in-situ co-precipitation reaction on the surface of the foamed nickel to obtain an oxygen evolution catalyst.

[0022] In the preparation method of the oxygen evolution catalyst provided by the embodiment of the present invention, the nickel foam is first placed in the ferrous salt solution so that the oxide layer on the surface of the nickel foam dissolves Ni in situ. 2+ , and then add bicarbonate solution to the preparation system, ionic HCO 3 - self ionizes CO 3 2- , so the self-ionized CO 3 2- than OH - The ion concentration is much larger, and in the liquid phase it first interacts with Fe 2+ Generate ferrous carbonate precipitates, th...

Embodiment 1

[0037] A kind of oxygen evolution catalyst, its preparation method comprises the steps:

[0038] 3mmol FeSO 4 ·7H 2 O. A magnetic stirrer and untreated nickel foam are added together into a two-neck flask, and an inert gas is filled by vacuum displacement. Inject 20 ml of deionized water that has been bubbled with inert gas with a syringe, and stir at room temperature for 30 minutes. Then use a syringe to inject 2 mmol NH that has been bubbled with an inert gas 4 HCO 3 aqueous solution. Stir at room temperature for 24 hours after injection. Take out the nickel foam, rinse the surface with deionized water, and dry it in a blast oven at 60°C for 6 hours.

Embodiment 2

[0040] A kind of oxygen evolution catalyst, its preparation method comprises the steps:

[0041] 3mmol FeSO 4 ·7H 2 O. A magnetic stirrer and untreated nickel foam are added together into a two-neck flask, and an inert gas is filled by vacuum displacement. Inject 20 ml of deionized water that has been bubbled with an inert gas with a syringe, and stir at room temperature for 5 minutes. Then use a syringe to inject 2 mmol NH that has been bubbled with an inert gas 4 HCO 3 aqueous solution. Stir at room temperature for 24 hours after injection. Take out the nickel foam, rinse the surface with deionized water, and dry it in a blast oven at 60°C for 6 hours.

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Abstract

The invention belongs to the technical field of electrochemistry, and particularly relates to an oxygen evolution catalyst, a preparation method thereof and an anode for water electrolysis. The preparation method of the oxygen evolution catalyst comprises the following steps: providing foamed nickel, putting the foamed nickel into a ferrous salt solution for mixing treatment, then adding a bicarbonate solution, and carrying out an in-situ co-precipitation reaction on the surface of the foamed nickel to obtain the oxygen evolution catalyst. The preparation method has mild conditions, the foamednickel is not required to be pretreated, a nickel ion raw material is not needed to be additionally added, and harsh growth conditions such as a hydrothermal condition and the like are avoided, so that the preparation process is effectively simplified, production efficiency is improved, preparation cost is reduced, and the finally obtained oxygen evolution catalyst has the characteristics of lowoxygen evolution over-potential, small impedance, and stable oxygen evolution activity.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to an oxygen evolution catalyst, a preparation method thereof, and an electrolytic water anode. Background technique [0002] Hydrogen production by electrolysis of water (2H 2 O→O 2 +2H 2 ), as an efficient way to obtain clean energy, has attracted much attention in the scientific community. Among them, the oxygen evolution reaction (2H 2 O→4H + +O 2 +4e – ) is a 4-electron electrochemical reaction process in which the O-H bond is broken and the O-O bond is formed. The chemical kinetics of this process is slow and the efficiency is low (shown as a high overpotential). Important role (reduce the overpotential, accelerate the reaction process). Traditional oxygen evolution catalysts, such as metal platinum, ruthenium, iridium and their oxides, have excellent performance. However, most of these catalysts are noble metals, which are scarce in output and exp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755C25B1/04C25B11/06
Inventor 邓远名刘再冉汤皎宁王立
Owner SHENZHEN UNIV
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