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CeO2-based electrocatalytic oxygen production catalyst and preparation method and application thereof

An oxygen catalyst and electrocatalysis technology, applied in the field of electrocatalysis, can solve the problems of no catalytic activity or weak catalytic activity, and achieve the effects of improved electrocatalytic oxygen production performance, obvious economic benefits, and simple process

Active Publication Date: 2020-05-29
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the invention is to solve the problem of CeO in the prior art 2 In the process of electrocatalytic oxygen generation, there is no problem of catalytic activity or weak catalytic activity, thus significantly improving the CeO 2 The electrocatalytic activity enables it to be used alone in electrocatalytic oxygen generation

Method used

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  • CeO2-based electrocatalytic oxygen production catalyst and preparation method and application thereof
  • CeO2-based electrocatalytic oxygen production catalyst and preparation method and application thereof
  • CeO2-based electrocatalytic oxygen production catalyst and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0040] CeO 2 The preparation of -f comprises the steps:

[0041] (1) Ultrasonic rinse the commercially available carbon cloth substrate in a mixed solution (30% wt) of sulfuric acid and nitric acid (volume ratio 1:1) for 2 hours. Air dry naturally;

[0042] (2) After the washed carbon cloth is made into an electrode, it is soaked in CeO 2 precursor solution, heated the solution to 70°C and applied a constant current of 0.25 mA / cm2 for 20 minutes, CeO 2 Will be generated in situ on the carbon cloth surface.

[0043] The CeO 2 The precursor solution is a mixed solution of 2 mmol cerium nitrate and 10 mmol sodium chloride.

Embodiment 2

[0045] a CeO 2 Based electrocatalytic oxygen generation catalyst, its preparation method comprises the steps:

[0046] (1) According to the method of embodiment 1, CeO 2 Fresh samples were deposited onto the carbon cloth surface to obtain CeO 2 -f;

[0047] (2) A three-electrode system is adopted, the reference electrode is silver / silver chloride, the counter electrode is platinum wire, fresh CeO 2 (CeO 2 -f) as a working electrode, the electrolyte is 1M KOH solution;

[0048] (3) Using the electrochemical workstation, the CeO 2 -f 30 cyclic voltammetry (CV) scans in the voltage range from 1 to −0.5 V versus the reversible hydrogen electrode to produce CeO 2 Electrocatalytic oxygen generation catalyst;

[0049] (4) CeO 2 The electrocatalytic oxygen generation catalyst was taken out from the solution and rinsed with ultrapure water several times, then placed in the air to dry naturally, named CeO 2 .

Embodiment 3

[0051] a CeO 2 Based electrocatalytic oxygen generation catalyst, its preparation method comprises the steps:

[0052] (1) According to the method of embodiment 1, CeO 2 Fresh samples were deposited onto the carbon cloth surface to obtain CeO 2 -f;

[0053] (2) CeO 2 -f is placed in the quartz tube of the tube furnace, and 5% hydrogen / argon is introduced into the quartz tube for 30 minutes to remove the air in the quartz tube, so that the quartz tube is filled with 5% hydrogen / argon;

[0054] (3) Continue to feed 5% hydrogen / argon, and at the same time raise the temperature to 500°C at a rate of 10°C / min and keep it warm for 2 hours;

[0055] (4) After the heat preservation is over, the sample in the quartz tube is naturally cooled to room temperature with the furnace, and the ventilation is closed to take out the sample, which is named CeO 2 -H 2 .

[0056] The prepared CeO 2 -H 2 Planar structures under different magnification electron microscopes such as image 3 ...

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Abstract

The invention relates to a CeO2-based electrocatalytic oxygen production catalyst and a preparation method and application thereof. It is found through a large number of experiments that the activityof CeO2 can be remarkably improved by increasing the content of Ce3+ in CeO2, and therefore CeO2 is activated. The catalytic oxygen production performance of the CeO2-based electro-catalytic oxygen production catalyst prepared by the method can be comparable with that of a traditional noble metal catalyst RuO2, and even the CeO2-based electro-catalytic oxygen production catalyst has more efficientcatalytic performance. The CeO2-based electrocatalytic oxygen production catalyst prepared by activating CeO2 is lower in preparation cost, simpler and more convenient in process, obvious in economicbenefit and very suitable for industrial large-scale production.

Description

technical field [0001] The invention belongs to the field of electrocatalysis, and relates to an oxygen-producing anode reaction catalyst, especially a CeO 2 Based electrocatalytic oxygen generation catalyst and its preparation method and application. Background technique [0002] The rapid development of society consumes more and more energy. The limited reserves of traditional fossil fuels such as oil, natural gas and coal, as well as the environmental pollution caused during use, force researchers to intensify their efforts to research and develop sustainable clean energy. energy. [0003] Hydrogen energy has become a popular clean energy due to its high combustion calorific value and basically zero pollution in the use process. The most environmentally friendly and promising hydrogen energy preparation technology is the electrolysis of water to produce hydrogen through sustainable energy sources such as wind energy and solar energy. The process of hydrogen production ...

Claims

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Application Information

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IPC IPC(8): B01J23/10C25B1/04C25B11/06
CPCB01J23/10C25B1/04C25B11/077C25B11/057B01J35/33Y02E60/36
Inventor 杨世和龙霞於俊
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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