MOFs-derived nickel-cobalt double hydroxide array electro-catalysis oxygen evolution material and preparation method thereof

A double hydroxide, electrocatalytic technology, applied in the field of electrocatalysis, to achieve the effect of accelerating the mass transfer process, improving oxygen evolution activity and stability, and improving catalytic activity

Pending Publication Date: 2022-01-07
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there are still some difficulties to overcome in the preparation method

Method used

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  • MOFs-derived nickel-cobalt double hydroxide array electro-catalysis oxygen evolution material and preparation method thereof
  • MOFs-derived nickel-cobalt double hydroxide array electro-catalysis oxygen evolution material and preparation method thereof
  • MOFs-derived nickel-cobalt double hydroxide array electro-catalysis oxygen evolution material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0032] (1) Preparation of three-dimensional array precursors formed by in situ growth of Co-MOFs nanosheets

[0033] First configure 0.04mol L -1 2-Methylimidazole aqueous solution and 0.005mol·L -1 Co(NO 3 ) 2 aqueous solution for later use; then soak the clean nickel foam in 500mL 2-methylimidazole solution for 12 hours until 2-methylimidazole is evenly adsorbed on the surface of the foam nickel; subsequently, add 500mL Co(NO 3 ) 2 water solution, continue to soak for 6 hours. The final product was taken out, washed, and dried to obtain a three-dimensional array precursor formed by the in-situ growth of purple Co-MOFs nanosheets. Its scanning electron microscope pictures are as figure 1 (a), (b) shown.

[0034] (2) Preparation of nickel-cobalt double hydroxide array electrocatalytic oxygen evolution material

[0035] At room temperature, soak the precursor in step 1 in 500mL 0.02mol L -1 Ni(NO 3 ) 2 In the ethanol solution, the nickel-cobalt double hydroxide array...

Embodiment 2

[0037] (1) Preparation of three-dimensional array precursors formed by in situ growth of Co-MOFs nanosheets

[0038] First configure 0.04mol L -1 2-Methylimidazole aqueous solution and 0.01mol·L -1 Co(NO 3 ) 2 aqueous solution for later use; then soak the clean nickel foam in 500mL 2-methylimidazole solution for 12 hours until 2-methylimidazole is evenly adsorbed on the surface of the foam nickel; subsequently, add 500mL Co(NO 3 ) 2 water solution, continue to soak for 6 hours. The final product was taken out, washed, and dried to obtain a three-dimensional array precursor formed by the in-situ growth of purple Co-MOFs nanosheets.

[0039] (2) Preparation of nickel-cobalt double hydroxide array electrocatalytic oxygen evolution material

[0040] At room temperature, soak the precursor in step 1 in 500mL 0.02mol L -1 Ni(NO 3 ) 2 In the ethanol solution, the nickel-cobalt double hydroxide array electrocatalytic material derived from MOFs can be obtained after standing f...

Embodiment 3

[0042] (1) Preparation of three-dimensional array precursors formed by in situ growth of Co-MOFs nanosheets

[0043] First configure 0.04mol L -1 2-Methylimidazole aqueous solution and 0.005mol·L -1 Co(NO 3 ) 2aqueous solution for later use; then soak the clean nickel foam in 500mL 2-methylimidazole solution for 12 hours until 2-methylimidazole is evenly adsorbed on the surface of the foam nickel; subsequently, add 500mL Co(NO 3 ) 2 water solution, continue to soak for 6 hours. The final product was taken out, washed, and dried to obtain a three-dimensional array precursor formed by the in-situ growth of purple Co-MOFs nanosheets.

[0044] (2) Preparation of nickel-cobalt double hydroxide array electrocatalytic oxygen evolution material

[0045] At room temperature, soak the precursor in step 1 in 500mL 0.01mol L -1 Ni(NO 3 ) 2 In the ethanol solution, the nickel-cobalt double hydroxide array electrocatalytic material derived from MOFs can be obtained after standing f...

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Abstract

The invention discloses a MOFs-derived nickel-cobalt double hydroxide array electro-catalysis oxygen evolution material and a preparation method thereof. The preparation method comprises the following steps: soaking foamed nickel in 2-methylimidazole, then adding Co salt, and continuously soaking to obtain a three-dimensional array precursor formed by in-situ growth of Co-MOFs nanosheets; and soaking the three-dimensional array precursor in Ni salt, and standing for reaction. The Co-MOFs array synthesized at room temperature is used as a precursor, the MOFs precursor is destroyed/recombined through an ion exchange strategy, the three-dimensional self-supported nickel-cobalt double hydroxide array electro-catalysis oxygen evolution material is obtained, the material provides more active sites and good three-dimensional conductivity, and the mass transfer process is accelerated; in addition, the catalytic activity is further improved through a strong coupling synergistic effect of bimetallic active sites; meanwhile, the MOFs derivative is in closer contact with the conductive substrate in an in-situ growth mode, and the electron transfer resistance is reduced.

Description

technical field [0001] The invention belongs to the technical field of electrocatalysis, and in particular relates to a MOFs-derived nickel-cobalt double hydroxide array electrocatalytic oxygen evolution material and a preparation method thereof. Background technique [0002] The increasing environmental and energy problems have brought great challenges to the development of modern society. As a research hotspot in the field of nanomaterials and energy chemistry, electrocatalytic water splitting is considered to be the most promising strategy to solve the energy crisis and environmental pollution. . Total water splitting includes two half-reactions of hydrogen evolution (HER) and oxygen evolution (OER). Compared with HER, OER has slower reaction kinetics, which is the decisive factor limiting the catalytic performance of total water splitting. Therefore, the design and development of highly efficient and low-cost oxygen evolution catalysts is crucial for practical applicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/091C25B1/04
CPCC25B11/091C25B1/04Y02E60/36
Inventor 裴浪厉高元勇军钟家松
Owner HANGZHOU DIANZI UNIV
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