Method for preparing sulfur-doped porous NiFe-LDH electrocatalyst at room temperature

An electrocatalyst and sulfur-doped technology, which is applied in the fields of electrolysis of water for oxygen production and material science, can solve problems such as poor activity, achieve the effects of improving oxygen evolution performance, simple and easy process, and easy large-scale preparation

Pending Publication Date: 2021-12-14
TAIYUAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the inherent poor activity of the catalytic sites of layered double hydroxides is still a drawback to be overcome

Method used

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  • Method for preparing sulfur-doped porous NiFe-LDH electrocatalyst at room temperature
  • Method for preparing sulfur-doped porous NiFe-LDH electrocatalyst at room temperature
  • Method for preparing sulfur-doped porous NiFe-LDH electrocatalyst at room temperature

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specific Embodiment 1

[0022] Specific embodiment 1: In this embodiment, the nickel foam is used as the substrate, and the three-dimensional NiFe-LDH nanosheets are grown on the nickel foam in situ by a hydrothermal method. NiFe-LDH was then infiltrated to a certain molar concentration of Na at room temperature 2 S 9H 2 Preparation of sulfur-doped porous NiFe-LDH nanosheet electrocatalysts in O solution.

[0023] The above method for preparing sulfur-doped porous NiFe-LDH nanosheet electrocatalyst at room temperature is carried out in the following steps:

[0024] (1) Cut the nickel foam into a rectangle of 2cm×4cm, ultrasonically treat it with 1M hydrochloric acid, acetone, alcohol and ultrapure water for 10 minutes to remove the oxide layer and dirt on the surface, and then vacuum dry at 60°C for 10 minutes;

[0025] (2) 35mL 0.5mM Fe(NO 3 ) 3 9H 2 O, 1.5mM Ni(NO 3 )·6H 2 O and 2.5mM CO(NH 2 ) 2 Stir the mixed solution of the mixed solution evenly, put it into a hydrothermal reaction kett...

specific Embodiment 2

[0030] Specific Example 2: In this embodiment, nickel foam is used as the substrate, and three-dimensional NiFe-LDH nanosheets are grown on the nickel foam in situ by a hydrothermal method. NiFe-LDH was then infiltrated to a certain molar concentration of Na at room temperature 2 S·9H 2 Preparation of sulfur-doped porous NiFe-LDH nanosheet electrocatalysts in O solution.

[0031] (1) the pretreatment of foam nickel substrate and the preparation mode of NiFe-LDH are identical with step (1), step (2) and step (3) of embodiment one;

[0032] (2) At room temperature of 25°C, infiltrate NiFe-LDH to 0.2M Na 2 S·9H 2 O solution to stand for 3h. Then the samples were taken out, rinsed with ethanol and deionized water three times respectively, and then dried under vacuum at 60°C for 6 hours;

[0033] (3) The electrochemical test of this embodiment is carried out in a three-electrode electrolytic cell under the condition of 25°C and normal pressure, the counter electrode is Pt (10×...

specific Embodiment 3

[0034] Specific Example 3: In this embodiment, the nickel foam is used as the substrate, and the three-dimensional NiFe-LDH nanosheets are grown on the nickel foam in situ by a hydrothermal method. NiFe-LDH was then infiltrated to a certain molar concentration of Na at room temperature 2 S·9H 2 Preparation of sulfur-doped porous NiFe-LDH nanosheet electrocatalysts in O solution.

[0035] (1) the pretreatment of foam nickel substrate and the preparation mode of NiFe-LDH are identical with step (1), step (2) and step (3) of embodiment one;

[0036] (2) At room temperature of 25°C, infiltrate NiFe-LDH into 1M Na 2 S·9H 2 O solution to stand for 3h. Then the samples were taken out, rinsed with ethanol and deionized water three times respectively, and then dried under vacuum at 60°C for 6 hours;

[0037] (3) The electrochemical test of this embodiment is carried out in a three-electrode electrolytic cell under the condition of 25°C and normal pressure, the counter electrode is...

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Abstract

The invention provides a method for preparing a sulfur-doped porous NiFe-LDH nanosheet oxygen evolution electrocatalyst at room temperature. The method comprises the following steps: preparing a NiFe-LDH nanosheet by using a hydrothermal method, infiltrating and etching the NiFe-LDH nanosheet by using a Na2S. 9H2O solution with a certain molar concentration at room temperature, and carrying out vacuum drying to obtain the sulfur-doped porous NiFe-LDH nanosheet. According to the invention, high-temperature and high-pressure conditions needed by traditional sulfur doping are not needed, strong agglomeration of sulfides in material processing under a high-temperature condition can be avoided, and generation of harmful by-products is reduced. Metal cations are usually used as actual active sites of oxygen evolution reaction (OER), and sulfur anions doped at room temperature can be used as electron donors to adjust the polarization degree of the active sites of the metal cations, so an electronic structure beneficial to an electrocatalyst is generated. Meanwhile, a unique three-dimensional porous nanosheet structure is generated on the NiFe-LDH nanosheet due to etching, so the electrocatalyst exposes a large number of active sites and charge transfer channels, and shows excellent catalytic performance when being used as an electrochemical OER catalyst.

Description

technical field [0001] The invention relates to a method for preparing an electrocatalyst for anodic oxygen evolution reaction in alkaline solution, and belongs to the technical field of material science and the field of oxygen production by electrolysis of water. Background technique [0002] The low energy utilization efficiency of traditional fossil fuels, the unfriendly environment and the energy crisis caused by them seriously restrict the sustainable development of human society. Therefore, it is urgent to find clean and renewable energy sources, such as solar energy, wind energy, tidal energy, etc., to replace traditional fossil energy sources. However, the discontinuous supply and high abandonment rate of these energy sources limit the further large-scale development of clean and renewable energy. As an important secondary energy source, hydrogen has the characteristics of high energy density, diverse sources, easy storage, and diverse application industries. Compa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/031C25B11/051C25B11/091C25B1/04
CPCC25B11/031C25B11/051C25B11/091C25B1/04Y02E60/36
Inventor 王孝广万子豪马自在李晋平
Owner TAIYUAN UNIV OF TECH
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