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A kind of ultra-thin metal-organic framework nanosheet catalyst with lattice distortion, its preparation method and application

An ultra-thin metal and organic framework technology, applied in organic compound/hydride/coordination complex catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of unsatisfactory electrocatalytic water splitting oxygen evolution performance Problems such as not optimizing the position of the bimetallic energy band and not fully exposing the active site can achieve good catalytic stability, lower energy barrier, and low overpotential

Active Publication Date: 2021-11-09
ZHEJIANG UNIV
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  • Abstract
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Problems solved by technology

However, the three-dimensional nano-flower iron-nickel tartrate bimetallic organic framework compound lacks a good spatial structure and cannot fully expose the active sites.
At the same time, because the energy band position of the bimetal is not optimized, the performance of electrocatalytic water splitting and oxygen evolution is not ideal.
[0005] CN 110655654 A discloses the preparation of a two-dimensional layered cobalt-based metal-organic framework (Co-MOF) electrode material and the research on its oxygen evolution performance. The two-dimensional layered Co-MOF is prepared by a hydrothermal method, and it has better performance as an electrode material. Its oxygen evolution reaction performance is better than that of Cu-MOF, but there is still a certain gap compared with noble metal catalysts with good oxygen evolution performance, such as large reaction energy barrier and slow reaction kinetics.

Method used

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  • A kind of ultra-thin metal-organic framework nanosheet catalyst with lattice distortion, its preparation method and application
  • A kind of ultra-thin metal-organic framework nanosheet catalyst with lattice distortion, its preparation method and application
  • A kind of ultra-thin metal-organic framework nanosheet catalyst with lattice distortion, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Synthesis of CoBDC FcCA catalyst: 166mg of terephthalic acid and 34.50mg of ferrocenecarboxylic acid were added to a mixed solution of N,N-dimethylformamide, absolute ethanol and deionized water (32mL:2mL:2mL), Subsequently, 238 mg of cobalt chloride hexahydrate was added to the above solution, and 1.5 mL of triethylamine was added rapidly at the same time, and magnetically stirred for 10 min. Then the above-mentioned mixed solution was transferred to a cell disruptor, and the strength of 700W was used for ultrasonic peeling for 500min. Then use absolute ethanol to wash several times, and use a 10000r / s high-speed centrifuge to separate the solid sample. Finally, the samples were dried under vacuum at room temperature for 12 h.

[0041] The catalyst after adding cobalt chloride and stirring is directly dried to obtain block CoBDC FcCA catalyst. What is finally obtained after sonication is an ultrathin CoBDC FcCA catalyst.

Embodiment 2

[0045] According to the preparation process of Example 1, the only difference is that 11.50 mg of ferrocenecarboxylic acid was added to obtain the CoBDC Fc0.05 catalyst.

Embodiment 3

[0047] According to the preparation process of Example 1, the only difference is that 23.00 mg of ferrocenecarboxylic acid was added to obtain the CoBDC Fc0.1 catalyst.

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Abstract

The invention relates to the technical field of energy material synthesis, and discloses an ultra-thin metal-organic framework nanosheet catalyst with lattice distortion, its preparation method and application. Terephthalic acid and ferrocenecarboxylic acid are dissolved in a mixed solution of DMF, ethanol and water , adding cobalt salt and acid-binding agent, after ultrasonic stripping, washing and separation to obtain the lattice distortion ultra-thin metal-organic framework nanosheet catalyst. Due to the lattice distortion caused by ferrocenecarboxylic acid and the ultra-thin two-dimensional nanosheet structure obtained by ultra-long-term ultrasound, it has a larger specific surface area and exposes more active sites, which can promote the oxygen evolution reaction. It has good catalytic stability, and has the advantages of low cost, high utilization rate, strong pertinence, and good effect.

Description

technical field [0001] The invention relates to the technical field of energy material synthesis, in particular to an ultra-thin metal-organic framework nanosheet catalyst with lattice distortion, its preparation method and application. Background technique [0002] Hydrogen is recognized as one of the cleanest and high-value energy carriers. The carbon emission is zero when hydrogen is burned or oxidized in fuel cells, which makes hydrogen play an important role in alleviating the increasing energy demand. Electrochemical water splitting technology can help produce clean and storable hydrogen. However, the overall efficiency of electrochemical water splitting is limited by the oxygen evolution reaction at the anode. The oxygen evolution reaction (OER) has slower reaction kinetics due to the multi-step proton-coupled electron transfer process, and needs to overcome a higher reaction energy potential. barrier, which plays an important role as a rate-limiting step in the elec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/22B01J35/10C25B11/095C25B1/04
CPCB01J31/1691B01J31/223C25B11/04C25B1/04B01J2531/845B01J35/33B01J35/61Y02E60/36
Inventor 侯阳何凡杨彬张庆华雷乐成
Owner ZHEJIANG UNIV
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