Lattice-distorted ultrathin metal organic framework nanosheet catalyst and preparation method and application thereof

Abstract

The invention relates to the technical field of energy material synthesis, and discloses a lattice-distorted ultrathin metal organic framework nanosheet catalyst and a preparation method and application thereof. The preparation method comprises the following steps: dissolving terephthalic acid and ferrocenecarboxylic acid in a mixed solution of DMF, ethanol and water, adding cobalt salt and an acid-binding agent, ultrasonically stripping, washing and separating to obtain the lattice-distorted ultrathin metal organic framework nanosheet catalyst. The ultrathin two-dimensional nanosheet structure obtained by lattice distortion caused by ferrocenecarboxylic acid and ultralong-time ultrasonic treatment has a larger specific surface area, more active sites are exposed, the oxygen evolution reaction can be promoted, and the nanosheet structure has good catalytic stability, and has the advantages of low cost, high utilization rate, strong pertinence, good effect and the like.

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...

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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.

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