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Preparation method of trimetal double hydroxide hollow nanocage oxygen evolution electrocatalyst

A double hydroxide and electrocatalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., to ensure stability, simple manual operation, and rapid response Effect

Pending Publication Date: 2021-01-26
HARBIN ENG UNIV
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Problems solved by technology

However, it is still a great challenge to develop OER electrocatalysts with high activity, high current density and high stability.

Method used

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  • Preparation method of trimetal double hydroxide hollow nanocage oxygen evolution electrocatalyst
  • Preparation method of trimetal double hydroxide hollow nanocage oxygen evolution electrocatalyst
  • Preparation method of trimetal double hydroxide hollow nanocage oxygen evolution electrocatalyst

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] The purpose of the present invention is achieved like this:

[0029] 1) First synthesize zeolite imidazolate metal-organic framework-67 (ZIF-67) crystal [2] . A certain amount of cobalt nitrate hexahydrate methanol solution and a certain amount of 2-methylimidazole (2-MIM) methanol solution are mixed, magnetically stirred evenly, and left to stand at room temperature for more than 12 hours. The purple precipitate was collected by centrifugation and washed several times with methanol, and dried under vacuum at 40°C.

[0030] 2) Second, the core-shell structure of ZIF-67@CoNi layered double hydroxide (ZIF-67@CoNi-LDH) was synthesized. ZIF-67 is dispersed in ethanol solution, and a certain amount of nickel nitrate hexahydrate ethanol solution is added quickly. The above mixture was stirred at room temperature for 90 min to obt...

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Abstract

The invention provides a preparation method of a trimetal double hydroxide hollow nanocage oxygen evolution electrocatalyst. The preparation method is characterized by comprising the following steps:1 synthesizing zeolite imidazolate metal organic framework -67 crystals; 2 synthesizing a ZIF-67 (at) CoNi layered double hydroxide core-shell structure; and 3 synthesizing a FeCoNi-LDH hollow structure. The method is energy-saving and environment-friendly, and can be used for preparing at normal temperature and normal pressure; manual operation is simple, and batch production is expected to be achieved; the structure and the performance are controllable, and the content of the introduced Fe element is controlled according to different stirring time so as to obtain the FeCoNi-LDH catalyst withgood OER performance. LDH has a unique layered structure, and the sheet structure can expose more active sites; the porous structure formed between nanosheets can increase the specific surface area of the material, provide a buffer space for the reaction, reduce the structural deformation in the reaction, and ensure the stability of the material.

Description

technical field [0001] The invention relates to a preparation method of a trimetallic double hydroxide hollow nano-cage oxygen evolution electrocatalyst, in particular to a method for batch synthesis of an efficient oxygen evolution electrocatalyst. Background technique [0002] Efficient oxygen evolution (OER) electrocatalysts are of great importance for various energy storage and conversion, such as electrochemical water splitting and metal-air batteries. However, developing OER electrocatalysts with high activity, high current density, and high stability remains a great challenge. Herein, a facile room-temperature stirring strategy is proposed to prepare trimetallic FeCoNi layered double hydroxide hollow nanocage materials (FeCoNi-LDH) using metal-organic frameworks as precursors. FeCoNi-LDH has a hollow feature and consists of multilayer double hydroxide nanoflakes. Through the design of unique structure and the adjustment of metal composition, FeCoNi-LDH has obtained ...

Claims

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Application Information

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IPC IPC(8): B01J23/755B01J35/10
CPCB01J23/755B01J23/007B01J35/33B01J35/61
Inventor 陈玉金张潇朱春玲闫峰
Owner HARBIN ENG UNIV
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