Phosphor-doped dual-function perovskite-based catalyst and preparation method thereof

A technology of perovskite oxide and phosphorus doping, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. It can solve the problems of complex preparation process, low catalyst stability, and low efficiency. problems, to achieve the effect of cost reduction, environmental protection and pollution-free preparation cycle, and low cost

Inactive Publication Date: 2017-12-19
HUAZHONG UNIV OF SCI & TECH
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  • Description
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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a phosphorus-doped dual-functional perovskite-based catalyst and its preparation method, thereby solving the complex preparation process, high cost and low efficiency of the prior art. And the technical problem that the stability of the catalyst obtained is not high

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  • Phosphor-doped dual-function perovskite-based catalyst and preparation method thereof
  • Phosphor-doped dual-function perovskite-based catalyst and preparation method thereof
  • Phosphor-doped dual-function perovskite-based catalyst and preparation method thereof

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preparation example Construction

[0028] A method for preparing a phosphorus-doped bifunctional perovskite-based catalyst, comprising:

[0029] (1) Mix the perovskite oxide precursor and the organic complex to obtain a gel, then calcine the gel at a low temperature to remove the organic complex, and then calcine at a high temperature to form a perovskite structure;

[0030] (2) The chemical vapor deposition technique is used for the perovskite structure material, and phosphorus doping is carried out under inert gas to obtain a phosphorus-doped bifunctional perovskite-based catalyst.

Embodiment 1

[0032] A preparation method of phosphorus-doped bifunctional perovskite-based catalyst, such as figure 1 shown, including:

[0033] (1) The perovskite oxide precursor was prepared by the sol-gel method. Weighed 0.01mol of lanthanum nitrate and 0.01mol of ferric nitrate and dissolved them in 100ml of deionized water. After the lanthanum nitrate and ferric nitrate were dissolved, add 0.02mol of ethylenediaminetetraacetic acid and 0.04mol of citric acid;

[0034] (2) After stirring the solution in step (1) for 4 hours with a magnetic stirrer, add about 25ml (25-28%) of ammonia water, and adjust the pH of the solution to be 8;

[0035] (3) Place the solution in step (2) in an oil bath, heat and stir at 110° C. for 3.5 hours with a magnetic heating stirrer to form a purple-red viscous gel;

[0036] (4) Put the gel obtained in step (3) in a crucible, first calcined at 250°C for 5 hours at a low temperature to remove organic complexes, and the heating rate was 2°C / min, and then cal...

Embodiment 2

[0045] A method for preparing a phosphorus-doped bifunctional perovskite-based catalyst, comprising:

[0046] (1) The perovskite oxide precursor was prepared by the sol-gel method. Weighed 0.01mol of lanthanum nitrate and 0.01mol of ferric nitrate and dissolved them in 100ml of deionized water. After the lanthanum nitrate and ferric nitrate were dissolved, add 0.02mol of EDTA and 0.04mol of glycine;

[0047] (2) After stirring the solution in step (1) for 4 hours with a magnetic stirrer, add about 25ml (25-28%) of ammonia water, and adjust the pH of the solution to be 8;

[0048] (3) Place the solution in step (2) in an oil bath, heat and stir at 110° C. for 3.5 hours with a magnetic heating stirrer to form a purple-red viscous gel;

[0049] (4) Put the gel obtained in step (3) in a crucible, first calcined at 250°C for 5 hours at a low temperature to remove organic complexes, and the heating rate was 2°C / min, and then calcined at a high temperature for 5 hours at 950°C to fo...

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Abstract

The invention discloses a phosphor-doped dual-function perovskite-based catalyst and a preparation method thereof. The method comprises the following steps: a perovskite oxide precursor and an organic complex are mixed to obtain a gel, the gel is subjected to low temperature calcining to remove the organic complex, a perovskite structure substance is formed through calcining under high temperature, a chemical vapor deposition technology is employed on the perovskite structure substance, then the phosphor is doped under inert gas, and the phosphor-doped dual-function perovskite-based catalyst is obtained. The catalyst breaks up the traditional metallic element doping, and the non metallic element phosphor is employed for doping perovskite to improve the oxygen reduction and oxygen evolution reaction capability and stability. The method has the advantages of simple and easy operation, short preparation period and no pollution, and can be used for substituting a method for preparing an electrode material by the noble metal catalyst with large scale.

Description

technical field [0001] The invention belongs to the field of materials and electrochemical energy storage new energy, and more specifically relates to a phosphorus-doped bifunctional perovskite-based catalyst and a preparation method thereof. Background technique [0002] The development of non-precious metal catalysts with efficient oxygen reduction (Oxygen Reaction Reaction, ORR) and oxygen evolution (Oxygen Evolution Reaction, OER) capabilities is a necessary condition for renewable energy storage. Despite the enormous efforts of scientific researchers, developing electrocatalytic materials at low cost is still a great challenge. The precious metal platinum and its alloys are recognized as catalysts with good oxygen reduction performance, but their oxygen evolution ability is weak; correspondingly, iridium dioxide and ruthenium dioxide have very good oxygen evolution performance, but their oxygen reduction ability poor. Meanwhile, platinum and its alloys, iridium dioxid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83
CPCB01J23/83B01J35/0033B01J35/026B01J37/0018B01J37/28
Inventor 王春栋李志山江建军
Owner HUAZHONG UNIV OF SCI & TECH
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