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Oxygen evolution electrocatalytic material, preparation method and applications thereof

A technology of electrocatalytic materials and catalytic materials, applied in the field of oxygen evolution electrocatalytic materials and their preparation, can solve the problems of insufficient exposure of active sites and inability to maximize the use of catalytic activity, so as to promote electron and mass transfer, The effect of accelerating reaction kinetics and high current density

Active Publication Date: 2020-01-03
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of FeNi-based LDH's own structure and conductivity, the active sites are not fully exposed, so that its catalytic activity cannot be utilized to the greatest extent.

Method used

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  • Oxygen evolution electrocatalytic material, preparation method and applications thereof
  • Oxygen evolution electrocatalytic material, preparation method and applications thereof
  • Oxygen evolution electrocatalytic material, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Pretreatment of the substrate: 0.8g of stainless steel (SS, 304, containing Fe: 50-60wt%, Ni: 8-11wt%, Cr: 18-20wt%, 1000 mesh) with a size of 4cm × 2.5cm Submerged in dilute hydrochloric acid (2.0mol / L HCl), ethanol and distilled water and ultrasonically washed to remove the surface oxide layer and organic residues, and then dried in an oven at 60°C.

[0047] (2) Add 20.0mg 2,5-dihydroxyterephthalic acid, 15mL hydrochloric acid solution (2.0mol / L) and 15mL N,N-dimethylacetamide (DMA ) and stir evenly to form a mixed solution. Then put the stainless steel sheet pretreated in step (1) into the reactor as the growth substrate and metal source. The sealed reaction kettle was heated in an oven and kept at 150°C for 18 hours. After natural cooling to room temperature, the obtained dark green FeNiCr-LDH-SS was washed several times with ethanol and distilled water and dried at 60 °C.

Embodiment 2

[0049] (1) The pretreatment of the substrate is the same as the step (1) of Example 1.

[0050] (2) Add 15 mL of hydrochloric acid solution (2.0 mol / L) and 15 mL of N,N-dimethylacetamide (DMA) into a polytetrafluoroethylene reactor (50 mL) and stir evenly to form a mixed solution. Then the pretreated stainless steel sheet was put into the reactor as the growth substrate and metal source. The sealed reaction kettle was heated in an oven and kept at 150°C for 18 hours. After natural cooling to room temperature, the obtained dark green FeNiCr-LDH-SS was washed several times with ethanol and distilled water and dried at 60 °C.

Embodiment 3

[0052] (1) The pretreatment of the substrate is the same as the step (1) of Example 1.

[0053] (2) Add 5mg of 2,5-dihydroxyterephthalic acid, 15mL of hydrochloric acid solution (2.0mol / L) and 15mL of N,N-dimethylacetamide (DMA) into a polytetrafluoroethylene reactor (50mL) And stir evenly to form a mixed solution. Then the pretreated stainless steel sheet was put into the reactor as the growth substrate and metal source. The sealed reaction kettle was heated in an oven and kept at 150°C for 18 hours. After natural cooling to room temperature, the obtained dark green FeNiCr-LDH-SS was washed several times with ethanol and distilled water and dried at 60 °C.

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Abstract

The invention discloses an oxygen evolution electrocatalytic material, a preparation method and applications thereof, wherein the catalytic material contains an iron-nickel-chromium layered double hydroxide (FeNiCr-LDH) and a metal substrate, the FeNiCr-LDH vertically grows on the surface of the metal substrate in situ, and the metal substrate contains an iron element, a nickel element and a chromium element. According to the invention, a one-step hydrothermal synthesis method is adopted, a metal substrate is used as a semi-sacrificial template, ultrathin nano-sheet-like FeNiCr-LDH grows on the surface of the metal substrate in situ under the regulation and control of a 2,5-dihydroxy terephthalic acid ligand to obtain an electro-catalytic material, and the electro-catalytic material is directly used as a self-supporting electrode for an electro-catalytic oxygen evolution reaction; the prepared electro-catalytic material has excellent electro-catalytic activity and good electrochemicalstability; and the preparation process is simple and feasible, the cost is low, and the electro-catalytic material has a large-scale industrial application prospect.

Description

technical field [0001] The invention belongs to the field of electrochemistry, in particular to an oxygen evolution electrocatalytic material and its preparation method and application. Background technique [0002] In recent years, with the increasingly serious problems of energy shortage, climate warming and environmental pollution, finding new renewable green energy has become one of the important topics in the field of materials and energy research. Hydrogen energy is considered to be a new energy source with the greatest potential to replace traditional fossil fuels due to its advantages such as high energy density, zero carbon emissions, and no pollution. The earth is extremely rich in water resources, and electrochemical water splitting for hydrogen production has inestimable advantages and application prospects. However, the oxygen evolution reaction (OER) that occurs at the anode during electrochemical water splitting involves multi-step proton-coupled electron tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/86B01J35/10C25B11/06C25B1/04
CPCB01J23/866C25B11/04C25B1/04B01J35/33B01J35/60Y02E60/36
Inventor 朱起龙谢秀媛曹昌盛林华
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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