Preparation method and application of strontium perovskite catalytic cathode

A perovskite and catalytic electrode technology, which is applied in the field of preparation of strontium-based perovskite catalytic cathodes, can solve the problems of high cost and insufficient stability, and achieve the effects of low production cost, favorable electrical conductivity, and stable operating efficiency

Pending Publication Date: 2022-02-18
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the commonly used cathode materials are concentrated in a series of noble metals such as palladium, ruthenium, and platinum, as well as transition metals such as copper, iron, and cobalt, and their oxides, which often have problems such as high cost and insufficient stability.

Method used

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  • Preparation method and application of strontium perovskite catalytic cathode
  • Preparation method and application of strontium perovskite catalytic cathode
  • Preparation method and application of strontium perovskite catalytic cathode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1: comprise the following steps:

[0043] S1: the Cu(NO 3 ) 2 ·6H 2 O and Sr(NO 3 ) 2 Dissolve in 25ml of water according to the metal ion ratio of 1:1, where Cu(NO 3 ) 2 ·6H 2 O concentration is 0.25mol / L, Sr(NO 3 ) 2 The concentration is 0.25mol / L; dissolve 6.02g of sodium citrate monohydrate in 25ml of water, and mix the two solutions to make a total of 50mL of mixed solution, slowly add 6.9ml of ethylene glycol solution, stir slowly, and keep warm at 80°C for 10h , evaporated to dryness, is the gel;

[0044] S2: Cut the porous titanium sheet electrode to 3cm*3cm*2mm, soak it in 10% oxalic acid solution at 100°C, pickle it for 1 hour, and ultrasonicate until the solution becomes clear, which is the pretreated porous titanium sheet electrode;

[0045] S3: Soak the pretreated porous titanium sheet electrode in the gel until no bubbles are generated for 5 minutes;

[0046] S4: Dry the soaked porous titanium sheet electrode at 80°C for 20 minutes, t...

Embodiment 2

[0048] Embodiment 2: comprise the following steps:

[0049] S1: Fe(NO 3 ) 2 and Sr(NO 3 ) 2 Dissolve in 25ml of water according to the metal ion ratio of 1:1, in which Fe(NO 3 ) 2 Concentration is 0.25mol / L, Sr(NO 3 ) 2 The concentration is 0.25mol / L; dissolve 6.02g of sodium citrate monohydrate in 25ml of water, and mix the two solutions to make a total of 50mL of mixed solution, slowly add 6.9ml of ethylene glycol solution, stir slowly, and keep warm at 80°C for 10h , evaporated to dryness, is the gel;

[0050] S2: Cut the porous titanium sheet electrode to 3cm*3cm*2mm, soak it in 10% oxalic acid solution at 100°C, pickle it for 1 hour, and ultrasonicate until the solution becomes clear, which is the pretreated porous titanium sheet electrode;

[0051] S3: Soak the pretreated porous titanium sheet electrode in the gel until no bubbles are generated for 5 minutes;

[0052] S4: Dry the soaked porous titanium sheet electrode at 80°C for 20 minutes, then place it at 700...

Embodiment 3

[0054] Embodiment 3: comprise the following steps

[0055] S1: Co(NO 3 ) 2 ·6H 2 O and Sr(NO 3 ) 2 Dissolve in 25ml of water according to the metal ion ratio of 1:1, where Co(NO 3 ) 2 ·6H 2 O concentration is 0.25mol / L, Sr(NO 3 ) 2 The concentration is 0.25mol / L; dissolve 6.02g of sodium citrate monohydrate in 25ml of water, and mix the two solutions to make a total of 50mL of mixed solution, slowly add 6.9ml of ethylene glycol solution, stir slowly, and keep warm at 80°C for 10h , evaporated to dryness, is the gel;

[0056] S2: Cut the porous titanium sheet electrode to 3cm*3cm*2mm, soak it in 10% oxalic acid solution at 100°C, pickle it for 1 hour, and ultrasonicate until the solution becomes clear, which is the pretreated porous titanium sheet electrode;

[0057] S3: Soak the pretreated porous titanium sheet electrode in the gel until no bubbles are generated for 5 minutes;

[0058] S4: Dry the soaked porous titanium sheet electrode at 80°C for 20 minutes, then p...

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Abstract

The invention discloses a preparation method and application of a strontium perovskite catalytic cathode. The electrode comprises a porous titanium sheet electrode and a catalyst layer, the catalyst layer is a perovskite catalyst layer generated on the porous titanium sheet electrode in situ, the catalyst layer is SrMO3, and M is one or more of Cu, Fe and Co. The preparation method comprises the following steps: S1, mixing Sr(NO3)2 and M(NO3)2.6H2O with sodium citrate monohydrate and ethylene glycol, and evaporating the solution to dryness to obtain gel; s2, pretreating the porous titanium sheet electrode; s3, soaking the pretreated porous titanium sheet electrode in the gel until no bubble is generated; s4, drying and calcining the soaked porous titanium sheet electrode, and generating a catalyst layer on the surface of the porous titanium sheet electrode; s5, repeating the soaking, drying andcalcining steps to obtain the SrMO3 catalytic electrode. The SrMO3 catalytic cathode prepared through the method is simple in preparation method and high in ammonia nitrogen selectivity and can be used for sewage treatment, nitrate nitrogen is converted into ammonia nitrogen, and a foundation is laid for nitrate sewage recycling.

Description

technical field [0001] The invention relates to the technical field of electrochemical sewage treatment and resource utilization, in particular to a preparation method and application of a strontium-based perovskite catalytic cathode. Background technique [0002] Due to the extensive use of agricultural nitrogen fertilizers and the rapid development of metal processing and other industries, the pollution of nitrate nitrogen in water is becoming more and more serious. With the concept of "turning waste into wealth" and "carbon neutrality", it has become a priority to develop effective sewage treatment and resource technologies that can remove nitrate nitrogen from sewage and simultaneously convert it into ammonia nitrogen (an important agricultural nitrogen fertilizer). Research hotspots. [0003] At present, the commonly used treatment methods for nitrate nitrogen in sewage include ion exchange, reverse osmosis, membrane separation and biological denitrification. Among th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/78B01J35/04C02F1/461C02F101/16
CPCB01J23/78B01J35/0033B01J35/04C02F1/46109C02F2001/46133C02F2001/46161C02F2101/163
Inventor 杨立辉林辉吕斯濠杨文剑林泽钦
Owner DONGGUAN UNIV OF TECH
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