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A rare-earth metal-organic framework-derived bifunctional catalyst and its application

A bifunctional catalyst, organic framework technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of unsatisfactory catalytic performance, poor electrical conductivity, and low density of catalytic active sites.

Active Publication Date: 2022-03-22
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of poor crystallinity of existing rare earth compounds, low density of catalytic active sites, poor electrical conductivity and difficulty in meeting the requirements of zinc-air battery applications, the present invention provides a cobalt-doped bifunctional catalyst derived from a lanthanum-based organic framework Its preparation method and use

Method used

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  • A rare-earth metal-organic framework-derived bifunctional catalyst and its application
  • A rare-earth metal-organic framework-derived bifunctional catalyst and its application
  • A rare-earth metal-organic framework-derived bifunctional catalyst and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A La-MOF-NH 2 The preparation method of derived Co-doped La base bifunctional catalyst, it comprises the steps:

[0043] 1) Weigh 0.435g (1.94mM) of lanthanum nitrate hexahydrate, 0.017g (0.06mM, Co / (La+Co) mol ratio of 3%) and 0.362g of 2-aminoterephthalic acid ( 2mM) in 30mL of N,N-dimethylformamide, add a stirrer, stir evenly with a magnetic stirrer at room temperature for 30min;

[0044] 2) Put the uniformly mixed above solution into a 50mL polytetrafluoroethylene reactor, set the parameters of the forced air drying oven at 150°C, and conduct a hydrothermal reaction for 10h. After the hydrothermal kettle was naturally cooled to room temperature, the solid obtained from the reaction was repeatedly centrifuged and washed 3 times with DMF and methanol, and dried in a vacuum oven at 60°C for 12 hours;

[0045] 3) Put the dried sample into a tube furnace, transfer it to a quartz boat, place it in the middle constant temperature zone of the high temperature tube furnace...

Embodiment 2

[0059] A La-MOF-NH 2 The preparation method of derivative Co-doped La-based bifunctional catalyst is basically the same as that of Example 1, the difference is that:

[0060] In step (1), weigh lanthanum nitrate hexahydrate 0.857g (1.98mM), cobalt nitrate hexahydrate 0.006g (0.02mM, Co / (La+Co) mol ratio is 1%), the bifunctional catalyst obtained For sample 2.

Embodiment 3

[0062] A La-MOF-NH 2 The preparation method of derived Co-doped La-based bifunctional catalyst is basically the same as in Example 1, the difference is that in step (1), 0.823g (1.9mM) of lanthanum nitrate hexahydrate and 0.029g of cobalt nitrate hexahydrate are weighed (0.1 mM, Co / (La+Co) molar ratio is 5%), and the bifunctional catalyst obtained is designated as sample 3.

[0063] Such as Figure 11 Shown is a comparison chart of the oxygen reduction and oxygen evolution performance of the samples prepared in Comparative Example 1, Example 2 and Example 3. It can be seen from the figure that both sample 2 and sample 3 show better oxygen reduction and oxygen evolution activities than Comparative Example 1, indicating that the oxygen reduction and oxygen evolution performance of the catalyst can be improved by regulating Co doping to introduce appropriate oxygen vacancies.

[0064] In summary, the present invention adopts La-MOF-NH 2 In situ doping as a precursor to prepare...

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Abstract

The invention discloses a bifunctional catalyst derived from a rare-earth metal-organic framework and an application thereof, which is obtained by self-assembly with an organic ligand and a metal salt solution and then calcined at a high temperature. Specifically, lanthanum salt, cobalt salt and organic ligand are dispersed in a dispersant, hydrothermally reacted to obtain a solid product, and sintered in an inert gas environment to obtain a cobalt-doped bifunctional catalyst derived from a lanthanum framework. The catalyst material prepared by the present invention is rich in oxygen vacancies, which effectively regulates the electronic structure and chemical properties of the catalyst; in-situ cobalt doping promotes the La in the lanthanum-based compound 2 o 3 / La(OH) 3 The formation of the heterogeneous interface and the cooperative coupling of carbon materials allow the material to obtain more active sites; its unique porous hollow structure and mesopores provide more channels for mass transfer, which significantly improves the performance of oxygen reduction and oxygen evolution. At the same time, the high-efficiency bifunctional characteristics of the catalyst are realized, and it is used for the air cathode of zinc-air batteries, showing excellent battery performance.

Description

technical field [0001] The invention belongs to the technical field of electrocatalyst materials, and relates to a bifunctional catalyst derived from a rare earth metal organic framework and its application, in particular to a lanthanum-based metal organic framework material (La-MOF-NH 2 ) and La-MOF-NH 2 Derived Co-doped La 2 o 3 / La(OH) 3 Preparation method and application of composite electrocatalyst. Background technique [0002] With the aggravation of social energy shortage and environmental problems, the development and utilization of clean energy has greatly promoted the popularization of efficient, pollution-free energy conversion and storage equipment. Rechargeable zinc-air batteries are low-cost, pollution-free, and have a high theoretical energy density (1086Wh kg -1 ) and safe operation, it is considered to be a promising new chemical energy storage power source. [0003] During the discharge and charge of zinc-air batteries, the oxygen reduction reaction ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/88H01M4/90H01M12/08
CPCH01M4/8825H01M4/9041H01M4/9016H01M4/9083H01M4/9008H01M12/08
Inventor 王瑞林张洁陈金伟王刚周玉凤
Owner SICHUAN UNIV