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Electrocatalytic oxygen evolution material with fusiform structure as well as preparation method and application of electrocatalytic oxygen evolution material

A technology of electrocatalysis and oxygen evolution, applied in electrolytic organic material coating, electrolytic inorganic material coating, structural parts, etc. The effect of conductivity

Active Publication Date: 2021-06-01
LINYI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the prior art, the preparation of MOFs is mostly carried out in organic solvents, and the final product is in the form of powder or granule, which is difficult to use later, and the crosslinking agent added during use greatly affects the performance of the material.

Method used

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  • Electrocatalytic oxygen evolution material with fusiform structure as well as preparation method and application of electrocatalytic oxygen evolution material
  • Electrocatalytic oxygen evolution material with fusiform structure as well as preparation method and application of electrocatalytic oxygen evolution material
  • Electrocatalytic oxygen evolution material with fusiform structure as well as preparation method and application of electrocatalytic oxygen evolution material

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preparation example Construction

[0027] In a first aspect, the present invention provides a method for preparing an electrocatalytic oxygen evolution material with a shuttle structure, comprising the following steps:

[0028] Pretreatment of graphite flakes by immersion in strong acid;

[0029] The pretreated graphite sheet was used as the working electrode to build a three-electrode system for electrodeposition, and the electrodeposition solution was CoCl 2 And the mixed solution of dimethylimidazole, must deposit the graphite flake that micron plate is arranged;

[0030] The graphite sheet deposited with the micron sheet is calcined at high temperature to obtain the electrocatalytic oxygen evolution material.

[0031] In some embodiments, the strong acid solution is aqua regia.

[0032] Further, the graphite sheet is soaked in aqua regia for 10-14h. Soaking in aqua regia for a long time, combined with ultrasonic cleaning, can not only clean and remove impurities attached to the surface, but also improve ...

Embodiment 1

[0046] The graphite flakes (diameter 6mm, thickness 2mm, purity 99.9%) soaked 12 hours with the aqua regia solution of purchase, are neutral to the solution with deionized water cleaning, remove the impurity on the graphite flake surface, improve the hydrophilicity of the graphite flake surface, Add oxygen-containing functional groups. Place the acid-washed graphite sheet in an oven and dry it at 40°C for 12 hours for later use. The microscopic morphology of the graphite sheet surface after pickling treatment obtained by scanning electron microscopy is as follows: figure 1 shown. The surface of the blank graphite sheet presents a loose and irregular structure, which is conducive to the adsorption and deposition of ions.

[0047] A three-electrode system was built, the pretreated blank graphite sheet was fixed on the bottom of the electrode rod with conductive carbon glue as the working electrode, the saturated calomel electrode was used as the reference electrode, and the hi...

Embodiment 2

[0051] The graphite flakes (diameter 6mm, thickness 2mm, purity 99.9%) soaked 12 hours with the aqua regia solution of purchase, are neutral to the solution with deionized water cleaning, remove the impurity on the graphite flake surface, improve the hydrophilicity of the graphite flake surface, Add oxygen-containing functional groups. Place the acid-washed graphite sheet in an oven and dry it at 40°C for 12 hours for later use.

[0052] A three-electrode system was built, the pretreated blank graphite sheet was fixed on the bottom of the electrode rod with conductive carbon glue as the working electrode, the saturated calomel electrode was used as the reference electrode, and the high-purity carbon rod was used as the counter electrode. The electrodeposition solution is 0.6mol / L CoCl 2 , 0.075mol / L dimethylimidazole solution. Using cyclic voltammetry, set the deposition potential to -1.0 to 1.0V (vs. saturated calomel electrode), the scan rate to 50mV / s, and the number of s...

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Abstract

The invention discloses an electrocatalytic oxygen evolution material with a fusiform structure as well as a preparation method and application of the electrocatalytic oxygen evolution material. The preparation method comprises the following steps: soaking a graphite flake in strong acid for pretreatment; with the pretreated graphite flake as a working electrode, constructing a three-electrode system for electro-deposition, and obtaining graphite flake with deposited micron sheets, wherein an electrolyte solution is a mixed solution of CoCl2 and dimethylimidazole; and carrying out high-temperature calcination on the graphite sheet with the deposited micron sheets to obtain the electro-catalytic oxygen evolution material. The novel fusiform-structure micron sheet is obtained by using a normal-temperature electro-deposition method, the variety of MOFs-based electro-catalytic materials is enriched, and the catalytic oxygen evolution performance of the materials under the alkaline condition is effectively improved.

Description

technical field [0001] The invention relates to the technical field of synthesis of MOFs derived materials, in particular to a shuttle-shaped structure electrocatalytic oxygen evolution material and its preparation method and application. The shuttle-shaped electrocatalytic oxygen evolution material obtained based on the room temperature electrochemical deposition method coupled with high temperature calcination is a micron-scale MOFs derivative material, which has an efficient electrocatalytic oxygen evolution ability. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] In electrocatalytic energy conversion systems such as total water splitting, hydrogen-oxygen fuel cells, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/095C25B1/04C25D9/02C25D9/04H01M4/90
CPCC25B1/04C25D9/02C25D9/04H01M4/9008H01M4/9083Y02E60/50
Inventor 张红秀杜以法
Owner LINYI UNIVERSITY
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