A boron-induced amorphous layered double hydroxide electrocatalyst and its preparation and application

A kind of hydroxide electrocatalyst technology

Active Publication Date: 2020-05-05
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, almost all transition metal-based layered double hydroxide electrocatalysts cannot exhibit and maintain excellent electrocatalytic hydrogen evolution performance at large current densities.
Coupled with the relatively complicated preparation process and expensive cost, it is not suitable for large-scale industrial production and commercialization

Method used

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  • A boron-induced amorphous layered double hydroxide electrocatalyst and its preparation and application
  • A boron-induced amorphous layered double hydroxide electrocatalyst and its preparation and application
  • A boron-induced amorphous layered double hydroxide electrocatalyst and its preparation and application

Examples

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Embodiment 1

[0033] The preparation of boron-induced amorphous nickel-cobalt layered double hydroxide nanosheet electrocatalyst (3D A-NiCo LDH / NF) involves the following steps:

[0034] (1) The in-situ growth method is used to generate crystalline nickel-cobalt layered double hydroxide nanosheet precursor (3D NiCo LDH / NF) on the blank nickel foam with three-dimensional structure: intercept the blank nickel foam for pretreatment, including sequentially using Deionized water, acetone, and ethanol were ultrasonicated for 15 minutes, and then the blank nickel foam was rinsed with deionized water and dried at room temperature; then 8.8g of Ni(NO 3 ) 2 ·6H 2 O, 4.4g of Co(NO 3 ) 2 ·6H 2 O. The urotropine of 5g is dissolved in the mixed solvent of 50mL deionized water and 150mL ethanol, transfers in the beaker after ultrasonic 30min. Then put the pretreated blank nickel foam into the above solution, make it completely submerged, place it in an oven, react at 90°C for 9 hours, and after cooli...

Embodiment 2

[0044] The preparation of boron-induced amorphous nickel layered double hydroxide nanosheet electrocatalyst (3D A-Ni LDH / NF) involves the following steps:

[0045] (1) The precursor of crystalline nickel layered double hydroxide nanosheets (3D Ni LDH / NF) was grown on the blank nickel foam with three-dimensional structure by in-situ growth method: the blank nickel foam was intercepted for pretreatment, including sequentially using Deionized water, acetone, and ethanol were ultrasonicated for 15 minutes, and then the blank nickel foam was rinsed with deionized water and dried at room temperature; then 13.2g of Ni(NO 3 ) 2 ·6H 2 O. The urotropine of 5g is dissolved in the mixed solvent of 50mL deionized water and 150mL ethanol, transfers in the beaker after ultrasonic 30min. Then put the pretreated blank nickel foam into the above solution, make it completely submerged, place it in an oven, react at 90°C for 9 hours, and after cooling at room temperature, take out the foam nick...

Embodiment 3

[0049] The preparation of boron-induced amorphous cobalt layered double hydroxide nanosheet electrocatalyst (3D A-Co LDH / NF) involves the following steps:

[0050] (1) The crystalline cobalt layered double hydroxide nanosheet precursor (3D Co LDH / NF) was grown on the blank nickel foam with three-dimensional structure by in-situ growth method: the blank nickel foam was intercepted for pretreatment, including sequentially using Deionized water, acetone, and ethanol were ultrasonicated for 15 minutes, and then the blank nickel foam was rinsed with deionized water and dried at room temperature; then 10-15g of Co(NO 3 ) 2 ·6H 2 O. The urotropine of 3-8g is dissolved in the mixed solvent of 50mL deionized water and 150mL ethanol, transfers in the beaker after ultrasonic 30min. Then put the pretreated blank nickel foam into the above solution, make it completely submerged, place it in an oven, react at 90°C for 9 hours, and after cooling at room temperature, take out the foam nicke...

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Abstract

The invention relates to a boron-induced amorphous layered double hydroxide electrocatalyst as well as preparation and application thereof. The preparation method comprises the following steps: firstly, synthesizing a transition metal layered double hydroxide nanosheet crystal precursor on a foamed nickel substrate by utilizing an in-situ growth method; and amorphizing the crystal precursor through a room-temperature boronizing method to finally prepare the self-supporting hydrogen evolution catalyst of the amorphous layered double hydroxide nanosheet. Compared with the prior art, the method for inducing the amorphization of the layered double hydroxide crystals by doping boron atoms enables the electrocatalyst to have more active sites, lower electron transfer impedance and better corrosion resistance. When the electrocatalyst is used in a hydrogen evolution reaction, the electrocatalyst can show excellent electrocatalytic activity and stability under the condition of great current density.

Description

technical field [0001] The invention belongs to the technical field of hydrogen production by electrolysis of water, and relates to a boron-induced amorphous single-element or multi-element transition metal-based layered double hydroxide nanosheet electrocatalyst for hydrogen evolution reaction under high current and its preparation and application. Background technique [0002] As a part of today's renewable energy distribution system, hydrogen energy solves the uneven distribution of renewable energy in space and time; on the other hand, it has the advantages of high energy density, clean and pollution-free, and can effectively as a substitute for traditional fossil fuels. For the production of hydrogen, water electrolysis is a practical technology that meets the requirements of sustainable development, in which the hydrogen evolution (HER) reaction is one of the two half-reactions at its core. However, due to the slow thermodynamic and kinetic process of the hydrogen evo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/755B01J23/75C25B1/04C25B11/06
CPCB01J23/75B01J23/755B01J35/0013B01J35/0033C25B1/04C25B11/04Y02E60/36
Inventor 吴仁兵杨泓远郭佩芳
Owner FUDAN UNIV
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