Preparation method and application of petaloid metal organic framework material

Abstract

The invention discloses a preparation method and application of a petaloid metal organic framework material. Specifically, a hydrothermal method is adopted to control synthesis raw materials and a hydrothermal time so that the petaloid-morphology ZIF-67 material is synthesizd, and the synthesized petaloid-morphology ZIF-67 material is adopted as a positive electrode catalyst material for an oxygenevolution reaction so as to study application of the synthesized material in the oxygen evolution reaction. The ZIF-67 material is obtained through self-assembly of an organic ligand 2-methylimidazole, cobalt nitrate and a Fe2Co metal cluster salt in a methanol solvent system, and meanwhile on the basis of the synthesis, the reaction time is changed so as to regulate the morphology and convert the dodecahedron morphology into the petaloid morphology; and when the synthesized material is assembled into a three-electrode system for an oxygen evolution performance test, it is found through dataanalysis that the petaloid ZIF-67 material has better oxygen evolution performance than the ZIF-67 material with a dodecahedron morphology.

Description

technical field [0001] The present invention relates to a kind of 2-methylimidazole, cobalt nitrate, Fe 2 The ZIF-67 material obtained by self-assembly of Co metal cluster salts in a methanol solvent system, the catalyst electrode material prepared by adjusting the hydrothermal time and the mass ratio of the metal salt showed excellent performance for the oxygen evolution reaction (OER), and the control The petal-shaped morphology method is novel, and the oxygen evolution performance is better than that of the dodecahedral morphology. Background technique [0002] The construction of functional porous or macroporous materials with novel structures and excellent performances has been an important direction that researchers in the field of materials have paid extensive attention to in recent decades. MOFs is the abbreviation of metal-organic framework compound (English name Metal orgaicFramework). This type of material is composed of organic building units and inorganic metal...

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Problems solved by technology

However, the high-temperature pyrolysis process often leads to the loss of organic ligands and the aggregation of metals, which will completely destroy its structure and reduce the active sites; on the other hand, MOFs have the advantages of both homogeneous and heterogeneous catalysts in electrocatalysis , Structurally speaking, MOFs can be directly used as OER catalysts without calcination

The unsaturated metal atoms and hydroxide ligands on the surface of MOFs, as well as the bimetallic coupling effect greatly increase the electrocatalytic OER activity. However, there are still many challenges in designing functionalized MOFs to be directly used as efficient OER catalysts.

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