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Cerium-containing silver-based hydrotalcite oxygen reduction catalyst as well as preparation method and application thereof

A hydrotalcite and catalyst technology, applied in the field of cerium-containing silver-based hydrotalcite oxygen reduction catalyst and its preparation, can solve the problems of weakening the catalytic activity and poor catalytic activity of the oxygen reduction electrocatalyst

Active Publication Date: 2018-08-21
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, ceria is widely used as an oxygen storage medium and a stabilizer for multi-element oxide catalyst systems, but the composite method of ceria and silver oxide at this stage is just a simple material mixing, and this composite material can only improve the conductivity of the catalyst. The rate cannot solve the defect that the catalytic activity of the oxygen reduction electrocatalyst is weakened when ceria is added due to its poor catalytic activity.
Therefore, the catalytic activity of silver oxide / ceria composites prepared in the prior art is still poor

Method used

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  • Cerium-containing silver-based hydrotalcite oxygen reduction catalyst as well as preparation method and application thereof
  • Cerium-containing silver-based hydrotalcite oxygen reduction catalyst as well as preparation method and application thereof
  • Cerium-containing silver-based hydrotalcite oxygen reduction catalyst as well as preparation method and application thereof

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preparation example Construction

[0031] The invention provides a preparation method of a cerium-containing silver-based hydrotalcite oxygen reduction catalyst, comprising the following steps:

[0032] 1) mixing water-soluble silver salt, water-soluble zinc salt, water-soluble aluminum salt with alkaline solution and heating to obtain silver-zinc-aluminum hydrotalcite suspension;

[0033] 2) performing solid-liquid separation on the suspension obtained in step 1) to obtain a precipitate;

[0034] 3) mixing the precipitate obtained in step 2) with water, and hydrothermally reacting to obtain silver-zinc-aluminum hydrotalcite nanosheets;

[0035] 4) the silver-zinc-aluminum hydrotalcite nanoplate that described step 3) obtains and Ce(DTPA) 2- The anion exchange solution is anion exchanged to obtain Ce(DTPA) 2- Intercalated silver zinc aluminum hydrotalcite;

[0036] The Ce(DTPA) 2- The anion exchange liquid is obtained by mixing cerium salt solution, DTPA solution and sodium hydroxide solution;

[0037] 5) ...

Embodiment 1

[0065] 1) Add silver nitrate, zinc nitrate and aluminum nitrate to 100ml of water in a molar ratio of 1:1:1 to fully dissolve, add sodium hydroxide and sodium carbonate to 100ml of water in a molar ratio of 1:3 to fully dissolve; The two obtained solutions were mixed, and heated in a water bath at 70° C. for 30 minutes under a stirring condition to obtain a suspension of silver-zinc-aluminum hydrotalcite.

[0066] 2) The silver-zinc-aluminum hydrotalcite suspension is centrifuged to obtain the bottom sediment, and the centrifugal speed is 2000r / min;

[0067] 3) Redisperse the bottom sediment obtained after centrifugation in ultrapure water, transfer it to a 200mL hydrothermal reaction kettle, conduct a hydrothermal reaction at 140°C and 480kPa for 24 hours, filter through a filter membrane, wash, and vacuum dry to obtain particles Uniform white powdery silver-zinc-aluminum hydrotalcite nanosheets (AgZnAl-LDHs);

[0068] 4) Obtain 0.2M by adding NaOH dropwise, 50ml of DTPA (di...

Embodiment 2

[0073] Silver nitrate, zinc nitrate and aluminum nitrate are added to 100ml of water in a molar ratio of 1:1:1 and fully dissolved, and sodium hydroxide and sodium carbonate are added to 100ml of water in a molar ratio of 1:1 to fully dissolve; The two solutions were mixed, and heated in a water bath at 80° C. for 10 minutes with stirring to obtain a suspension of silver-zinc-aluminum hydrotalcite.

[0074] 2) The silver-zinc-aluminum hydrotalcite suspension is centrifuged to obtain the bottom sediment, and the centrifugal speed is 2000r / min;

[0075] 3) Redisperse the bottom sediment obtained after centrifugation in ultrapure water, transfer it to a 200mL hydrothermal reaction kettle, conduct a hydrothermal reaction at 150°C and 400kPa for 10 hours, filter through a filter membrane, wash, and vacuum dry to obtain particles Uniform white powdery silver-zinc-aluminum hydrotalcite nanosheets (AgZnAl-LDHs);

[0076] 4) Obtain 0.2M by adding NaOH dropwise, 50ml of DTPA (diethyltr...

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Abstract

The invention relates to the technical field of electrocatalysts and provides a cerium-containing silver-based hydrotalcite oxygen reduction catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a water-soluble silver salt, a water-soluble zinc salt, a water-soluble aluminum salt and an alkaline solution, heating to obtain silver-zinc-aluminum hydrotalcite suspension, performing solid-liquid separation to obtain a precipitate, and carrying out a hydrothermal reaction on the precipitate and water so as to obtain silver-zinc-aluminum hydrotalcite nanosheets; performing anion exchange with a Ce(DTPA)2-anion exchange solution so as to obtain Ce(DTPA)2-intercalated silver-zinc-aluminum hydrotalcite; finally performing pyrolysis and alkaline leaching, thereby obtaining the cerium-containing silver-based hydrotalcite oxygen reduction catalyst. The preparation method provided by the invention is low in cost and simple inprocess, and the prepared cerium-containing silver-based hydrotalcite oxygen reduction catalyst has excellent electrocatalytic activity.

Description

technical field [0001] The invention relates to the technical field of electrocatalysts, in particular to a cerium-containing silver-based hydrotalcite oxygen reduction catalyst and a preparation method and application thereof. Background technique [0002] The current mainstream batteries are divided into two categories, lithium-ion batteries and hydrogen-oxygen fuel cells. Among them, the production process of hydrogen in hydrogen-oxygen fuel cells is complicated, gas storage and transportation are difficult, and the cost is high. There are many hidden dangers in practical applications. Therefore, metals such as aluminum and magnesium are usually used to replace hydrogen to form metal fuel cells. . Metal fuel cells that use aluminum as fuel are collectively referred to as aluminum-air fuel cells, or aluminum-air batteries. A traditional aluminum-air fuel cell consists of an aluminum alloy negative electrode, an electrolyte, an air positive electrode, a battery case, and ...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/90H01M12/06
CPCH01M4/88H01M4/9016H01M12/06
Inventor 卢惠民洪清水王俊人金孟琪白俊杰李旭冬
Owner BEIHANG UNIV
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