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Three-dimensional multi-layered structure cobalt-nickel-aluminum ternary metal electrocatalyst for oxygen evolution reaction as well as preparation and application methods thereof

A technology of oxygen evolution reaction and electrocatalyst, which is applied in the direction of electrodes, electrolytic components, electrolysis process, etc., can solve the problems of limited exposure of oxygen evolution active components and easy aggregation of nanoparticles, so as to increase the electrochemical active area and reduce the potential barrier , good stability

Active Publication Date: 2018-09-14
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Layered double hydroxides (LDHs) are a class of highly ordered two-dimensional layered materials. Their structure and composition can be adjusted by changing the divalent or trivalent metal cations on the layer plate, and their catalytic performance can be tuned. , has good performance in oxygen evolution reaction, but the hydrotalcite structure has problems such as limited exposure of oxygen evolution active components, and easy aggregation of nanoparticles.

Method used

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  • Three-dimensional multi-layered structure cobalt-nickel-aluminum ternary metal electrocatalyst for oxygen evolution reaction as well as preparation and application methods thereof
  • Three-dimensional multi-layered structure cobalt-nickel-aluminum ternary metal electrocatalyst for oxygen evolution reaction as well as preparation and application methods thereof
  • Three-dimensional multi-layered structure cobalt-nickel-aluminum ternary metal electrocatalyst for oxygen evolution reaction as well as preparation and application methods thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The nickel foam substrate was ultrasonically cleaned in acetone solution for 15 minutes, then transferred to 2 mol / L hydrochloric acid for ultrasonic cleaning for 5 minutes, and then transferred to ethanol solution for ultrasonic cleaning for 5 minutes, and finally the foamed nickel substrate was rinsed thoroughly with deionized water. Then put it in an oven at 80°C for drying; dissolve 0.3492g cobalt nitrate, 0.15g aluminum nitrate, 0.6006g urea and 0.296g ammonium fluoride in 80mL water, transfer to a polytetrafluoroethylene liner, and put it into a high-pressure reaction Tighten the kettle, take it out after hydrothermal reaction at 150°C for 10 hours, cool it naturally, and dry overnight at 70°C. During the entire reaction process, a cobalt-nickel-aluminum hydrotalcite nanosheet array is grown vertically on the surface of the foamed nickel substrate. Prepare 40mL methanol solution containing 0.291g cobalt nitrate methanol solution, 0.324g 2-methylimidazole methanol so...

Embodiment 2

[0034] The foamed nickel substrate was ultrasonically cleaned in acetone solution for 5 minutes, then transferred to 3 mol / L hydrochloric acid for ultrasonic cleaning for 20 minutes, and then transferred to ethanol solution for ultrasonic cleaning for 20 minutes, and finally the foamed nickel substrate was thoroughly rinsed with deionized water. Then put it in an oven at 80°C for drying; dissolve 0.1746g cobalt nitrate, 0.075g aluminum nitrate, 0.3003g urea and 0.148g ammonium fluoride in 80mL water, transfer it to a polytetrafluoroethylene liner, and load it into a high-pressure reaction Tighten the kettle, heat it in water at 180°C for 6 hours, take it out, cool it naturally, and dry overnight at 70°C. During the entire reaction process, an array of cobalt-nickel-aluminum hydrotalcite nanosheets grows vertically on the surface of the foamed nickel substrate. Prepare 40mL methanol solution containing 2.328g cobalt nitrate methanol solution, 2.592g 2-methylimidazole methanol sol...

Embodiment 3

[0037] The nickel foam substrate was ultrasonically cleaned in acetone solution for 20 minutes, then transferred to 1 mol / L hydrochloric acid for ultrasonic cleaning for 5 minutes, and then transferred to ethanol solution for ultrasonic cleaning for 20 minutes, and finally the foamed nickel substrate was rinsed thoroughly with deionized water. Then put it in an oven at 50°C for drying; dissolve 0.2328g cobalt nitrate, 0.1g aluminum nitrate, 0.4004g urea and 0.192g ammonium fluoride in 80mL water, transfer to a polytetrafluoroethylene liner, and put it into a high-pressure reaction Tighten the kettle, take it out after hydrothermal heating at 80°C for 2h, cool it naturally, and dry overnight at 70°C. During the entire reaction process, an array of cobalt-nickel-aluminum hydrotalcite nanosheets grows vertically on the surface of the foamed nickel substrate. Prepare 40mL methanol solution containing 0.582g cobalt nitrate methanol solution, 0.648g 2-methylimidazole methanol solution...

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Abstract

The invention provides a three-dimensional multi-layered structure cobalt-nickel-aluminum ternary metal electrocatalyst for oxygen evolution reaction as well as a preparation and application method thereof. The electrocatalyst is based on layered double hydroxides (LDHs) and zeolite imidazole metal-organic frameworks (ZIF-67), nickel foam (NF) serves as a substrate, and a ZIF-67 / CoNiAl-LDH / NF three-dimensional multi-layed structure catalyst is synthesized through a two-step hydrothermal method. The electrocatalyst as well as the preparation and application method thereof have the advantages that through the introduction of the two-dimensional ZIF-67, the electrochemical active area of the catalyst can be improved, the formed unique three-dimensional multi-layed porous structure and a carrier with high specific surface area and abundant pore channels are beneficial for reducing the potential barrier of the oxygen evolution reaction, in addition, a super-hydrophobic interface is formed between a solid phase and a liquid phase, so that oxygen can be easily desorbed, the occurrence of the oxygen evolution reaction can be promoted, the electrocatalyst is applied to the oxygen evolutionreaction, the electric current density is 10 mA / cm<2>, the reaction overpotential is 0.3-0.41V, the Tafel slope is 88-245 mV / dec<-1>, in addition, the stability is good, and a good application prospect can be achieved.

Description

Technical field [0001] The invention belongs to the technical field of catalysts, and specifically relates to a three-dimensional multi-level structure cobalt-nickel-aluminum ternary metal electrocatalyst for oxygen evolution reaction and a preparation and use method thereof. Background technique [0002] Energy and environment are the most important issues of the 21st century. The global demand for energy has been growing rapidly and continuously, and the main energy demand in the next 15 years will be twice the amount of energy used today. So far, a large part (more than 80%) of energy supply comes from fossil fuels, but the burning of a large amount of fossil energy will cause greenhouse gas emissions, trigger the greenhouse effect, and lead to a series of problems such as global warming. Therefore, the development of clean and renewable energy sources to significantly reduce dependence on fossil fuels, which cause large amounts of carbon dioxide and soot, is an urgent issue....

Claims

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Application Information

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IPC IPC(8): C25B11/06C25B1/04C25B11/03
CPCC25B11/04C25B11/031C25B11/095Y02E60/36
Inventor 李峰赵英吉范国利杨兰
Owner BEIJING UNIV OF CHEM TECH
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