Preparation method and application of NiFe-LDH oxygen evolution electrocatalytic material

An electrocatalytic material and oxygen evolution technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problems affecting the catalytic performance and stability of electrodes, and the preparation cycle Long, high toxicity of raw materials and other problems, to achieve the effect of improving catalytic activity and stability, simple and easy preparation process, and low condition requirements

Inactive Publication Date: 2019-01-04
北京科技大学广州新材料研究院
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Problems solved by technology

However, the existing methods for preparing NiFe-LDH rich in cation vacancies, such as two-dimensional material engineering, high-temperature reduction method, and etching method, have disadvantages such as relatively complicated process, expensive equipment, high toxicity of raw materials, and long preparation cycle. Most of the samples are in powder state, need to add conductive agent and binder, which will affect the catalytic performance and stability of the electrode

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  • Preparation method and application of NiFe-LDH oxygen evolution electrocatalytic material
  • Preparation method and application of NiFe-LDH oxygen evolution electrocatalytic material
  • Preparation method and application of NiFe-LDH oxygen evolution electrocatalytic material

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Embodiment 1

[0036] (1) Pretreatment of the substrate: the Ni-Fe alloy substrate is cut into a rectangle of 3.5cm×0.5cm, the 1.5cm of the upper half is used as the clamping part, and the 2cm of the lower half is used as the actual use part. Soak the cut sample in acetone for 20 minutes, then immerse it in isopropanol for 20 minutes, and finally immerse it in alcohol for 20 minutes. Soak the cleaned substrate in absolute ethanol.

[0037] (2) Anodic oxidation of the substrate: the electrolyte composition used in the anodic oxidation process is 2wt% NaF, 4wt% (NH 4 ) 2 MoO 4 , 20 wt% H 2 O, 30 wt% glycerol and 44 wt% phosphoric acid. The lower half of the substrate pretreated in step (1) is immersed in the electrolyte, and the clamping part is connected with the anode electrode. The anodizing device is SP-150 electrochemical workstation, using a three-electrode system, the substrate is used as the working electrode, the platinum electrode is used as the counter electrode, and the saturat...

Embodiment 2

[0046] (1) The pretreatment of the substrate is the same as that of step (1) in Example 1.

[0047] (2) Anodic oxidation of the substrate: the electrolyte composition used in the anodic oxidation process is 3wt% NaF, 7wt% (NH 4 ) 2 MoO 4 , 20 wt% H 2 O, 30 wt% glycerol and 40 wt% phosphoric acid. The lower half of the substrate pretreated in step (1) is immersed in the electrolyte, and the clamping part is connected with the anode electrode. The anodizing device is SP-150 electrochemical workstation, using a three-electrode system, the substrate is used as the working electrode, the platinum electrode is used as the counter electrode, and the saturated calomel electrode is used as the reference electrode. Boost the voltage from the open circuit potential to 7.5V at a rate of 15mV / s, keep a constant voltage at 7.5V for 3min, and then -2 Maintain a constant current for 20 minutes under the current density, and the temperature of the electrolyte is 25°C.

[0048] (3) After ...

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Abstract

The invention relates to a preparation method and application of NiFe-LDH oxygen evolution electrocatalytic material rich in cation vacancy. The preparation method includes the steps of (1) soaking Ni-Fe alloy matrix in electrolyte which contains, by weight, 1-3% of NaF, 4-7% of (NH4)2MoO4, 15-25% of H2O, 25-40% of glycerol and 25-55% of phosphoric acid; (2) subjecting the Ni-Fe alloy matrix soaked in the electrolyte to anodizing to obtain NiFeMo anodized film; (3) subjecting a sample treated in step (2) to alkaline liquid etching, washing, and drying to obtain the NiFe-LDH oxygen evolution electrocatalytic material. The NiFe-LDH oxygen evolution electrocatalytic material prepared herein has high catalytic activity and good electrochemical stability; the preparation method is simple, efficient and low in cost, is well popularizable and helps further promote the development and application of LDH catalysts.

Description

technical field [0001] The invention relates to the field of new material technology and electrocatalysis, in particular to a preparation method and application of a NiFe-LDH oxygen evolution electrocatalysis material rich in cation vacancies. Background technique [0002] The current society's high dependence on fossil energy makes the national economy and national security very vulnerable to fluctuations in the price of fossil energy; moreover, fossil energy has shortcomings such as limited reserves, excessive use and aggravated environmental pollution. Therefore, it is particularly important to develop a pollution-free, renewable new energy source. Hydrogen energy has become one of the most promising energy sources in the 21st century due to its advantages such as wide sources, no pollution, high energy density, and easy storage. Hydrogen production by electrolysis of water has attracted much attention because of its low cost, simple equipment, mature technology, and abi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/04C25B1/06B01J23/755
CPCB01J23/755B01J35/0033C25B1/04C25B11/04Y02E60/36
Inventor 何新波许德英张涛
Owner 北京科技大学广州新材料研究院
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