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Method for rapidly preparing transition metal oxygen evolution catalyst by utilizing seawater

A transition metal and catalyst technology, applied in the field of electrocatalysis, can solve the problems of high overpotential and slow kinetics, and achieve the effects of low decomposition voltage, easy operation, and large seawater storage

Active Publication Date: 2020-10-30
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the oxygen evolution half reaction of water electrolysis is a kinetically slow reaction, and its overpotential is much higher than that of the hydrogen evolution reaction, which is the main factor limiting the efficiency of water splitting.

Method used

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  • Method for rapidly preparing transition metal oxygen evolution catalyst by utilizing seawater
  • Method for rapidly preparing transition metal oxygen evolution catalyst by utilizing seawater
  • Method for rapidly preparing transition metal oxygen evolution catalyst by utilizing seawater

Examples

Experimental program
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Effect test

Embodiment 1

[0038] S1. Perform coarse filtration pretreatment on the seawater, filter out the precipitated impurities, add 6g KCl to the beaker, take the filtered seawater and add it to the 100ml mark to prepare an electrolyte.

[0039] S2. Weigh 4g of discarded iron pieces, put them into 100mL of the above electrolyte, set the voltage window at 2.2V, and conduct electrolysis for 2 hours.

[0040] S3. Centrifuge the electrolyzed electrolyte solution for 4 minutes at a rotational speed of 5000 r / min, wash the centrifuged sediment several times with distilled water, and then dry it in an oven at a temperature of 50° C. for 5 hours.

[0041] S4. Soak the above-mentioned dried powder in 1mol / L KOH for 24 hours, and then dry the soaked powder in an oven at 70°C for 12 hours to obtain an iron-based catalyst, which is a mixture of iron oxide and iron hydroxide.

[0042] Depend on figure 1 The LSV can be seen at a current density of 10mAcm -2 , the oxygen evolution overpotential of the iron-bas...

Embodiment 2

[0044] S1. Perform coarse filtration pretreatment on seawater, filter out precipitated impurities, add 5g KBr into the beaker, take filtered seawater and add to 110ml mark line to prepare electrolyte.

[0045] S2. Weigh 7g of discarded nickel sheet, insert it into 110mL of the above electrolyte, set the voltage window at 2.4V, and conduct electrolysis for 0.5 hours.

[0046] S3. Centrifuge the electrolyzed electrolyte solution for 4 minutes at a rotational speed of 5000 r / min, wash the centrifuged sediment several times with distilled water, and then dry it in an oven at a temperature of 50° C. for 4 hours.

[0047] S4. Soak the dried powder in 1mol / L KOH for 24 hours, then dry the soaked powder in an oven at 70°C for 12 hours to obtain a nickel-based catalyst, which is a mixture of nickel oxide and nickel hydroxide.

[0048] Depend on figure 2 The LSV can be seen at a current density of 10mAcm -2 , the oxygen evolution overpotential of the nickel-based catalyst was 168mV. ...

Embodiment 3

[0050] S1. Perform coarse filtration pretreatment on seawater, filter out precipitated impurities, add 3gKI into the beaker, take the filtered seawater and add it to the 80ml mark to prepare an electrolyte.

[0051] S2. Weigh 6g of waste cobalt flakes, put them into 80mL of the above electrolyte, set the voltage window at 1.5V, and conduct electrolysis for 1.5 hours.

[0052] S3. Centrifuge the electrolyzed electrolyte solution for 6 minutes at a rotational speed of 3000 r / min, wash the centrifuged sediment several times with distilled water, and then dry it in an oven at a temperature of 50° C. for 6 hours.

[0053] S4. Soak the dried powder in 1mol / L KOH for 24 hours, then dry the soaked powder in an oven at 70°C for 12 hours to obtain a cobalt-based catalyst, which is a mixture of cobalt oxide and cobalt hydroxide.

[0054] Depend on image 3 The LSV can operate at a current density of 10mAcm -2 , the oxygen evolution overpotential of the cobalt-based catalyst was 194mV. ...

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Abstract

The invention discloses a method for rapidly preparing a transition metal oxygen evolution catalyst by utilizing seawater. The method comprises the following steps: carrying out pretreatment such as rough filtration on the seawater, removing impurities in the seawater, inoculating waste metal sheets as a metal source into the treated seawater, adding a proper amount of halogen salt as a buffer agent, adjusting a potential window, electrifying for electrolysis, repeatedly washing the obtained precipitate with distilled water for multiple times, and carrying out centrifugal drying to obtain theefficient oxygen evolution catalyst. The method is simple in design and easy to operate, the characteristics of low decomposition voltage and high metal corrosion speed of the seawater are utilized, the waste metal sheets are used as electrodes to electrolyze the seawater, the efficient oxygen evolution electrochemical catalyst is prepared, and the efficient oxygen evolution electrochemical catalyst has very important significance in environmental protection and seawater utilization.

Description

technical field [0001] The invention belongs to the field of electrocatalysis, in particular to a method for rapidly preparing a transition metal oxygen evolution catalyst by utilizing seawater. Background technique [0002] Seawater accounts for about 71% of the earth's surface area, and the stock of water in seawater is about 1.3*10 9 Billion tons, accounting for about 97% of the total water volume of the earth. At the same time, there are a large number of macro and trace elements in seawater, and seawater is highly corrosive, and its decomposition voltage is much lower than that of water. It can electrolyze seawater at a lower voltage and save energy. [0003] At the same time, with the depletion of fossil fuels and the increasingly serious energy crisis, people pay more attention to the development of renewable energy. Since the early 1970s, hydrogen has been regarded as an ideal clean energy. Electrolyzed water can also get the oxygen necessary for human survival. H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J23/75B01J23/755B01J37/34C25B11/06C25B1/04
CPCB01J23/745B01J23/75B01J23/755B01J37/348C25B11/04C25B1/04B01J35/33Y02E60/36
Inventor 高发明王静周恒张招资高毅程周军双
Owner YANSHAN UNIV
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