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Carbon-supported iron-doped tricobalt tetraoxide nanocrystal composite catalyst and preparation method thereof

A nano-composite catalyst technology of cobalt trioxide, which is applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as high-cost manufacturing processes, and achieve simplified preparation methods , superior performance and broad prospects

Inactive Publication Date: 2015-04-08
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its industrial application is still limited by its high cost and complicated production process, so transition metal oxides, as a low-cost catalyst with good catalytic activity, have been widely concerned

Method used

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  • Carbon-supported iron-doped tricobalt tetraoxide nanocrystal composite catalyst and preparation method thereof
  • Carbon-supported iron-doped tricobalt tetraoxide nanocrystal composite catalyst and preparation method thereof
  • Carbon-supported iron-doped tricobalt tetraoxide nanocrystal composite catalyst and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Ferric nitrate was used as iron salt precursor for doping.

[0028] (1) Prepare a certain proportion of 0.05mol / L soluble cobalt salt in an alcoholic aqueous solution, add nitric acid-treated carbon black into the solution, ultrasonically disperse for 15min to 60min, add dropwise ammonia water with a volume fraction of 20%, and ultrasonically disperse for 15min to 60min, Dissolve a certain amount of iron salt precursor in the solution, the molar ratio of cobalt to iron is 1:1, and press to obtain a suspension containing cobalt salt, iron salt and carbon black carrier.

[0029] (2) Pour the solution into the flask, condense and reflux in a magnetically stirred oil bath, the oil bath temperature is constant, and the reaction time is 10h. After the reaction, the reaction solution is suction filtered, washed, and dried under 80°C. ℃ drying for 12h. The composite catalyst precursor solid powder is obtained.

[0030] (3) Heat-treat the obtained solid powder of the composite...

Embodiment 2

[0033] Doping with ferrous sulfate as iron salt precursor.

[0034] (1) Prepare a certain proportion of 0.05mol / L soluble cobalt salt in an alcoholic aqueous solution, add nitric acid-treated carbon black into the solution, ultrasonically disperse for 15min to 60min, add dropwise ammonia water with a volume fraction of 20%, and ultrasonically disperse for 15min to 60min, A certain amount of iron salt precursor is dissolved in the solution, the molar ratio of cobalt to iron is 1:1, and a suspension containing cobalt salt, iron salt and carbon black carrier is obtained.

[0035] (2) Pour the solution into the flask, condense and reflux in a magnetically stirred oil bath, the oil bath temperature is constant, and the reaction time is 10h. After the reaction, the reaction solution is suction filtered, washed, and dried under 80°C. ℃ drying for 12h. The composite catalyst precursor solid powder is obtained.

[0036] (3) Heat-treat the obtained solid powder of the composite cataly...

Embodiment 3

[0039] Adjust the molar ratio of cobalt to iron to be 3:1.

[0040] (1) Prepare a certain proportion of 0.05mol / L soluble cobalt salt in an alcoholic aqueous solution, add nitric acid-treated carbon black into the solution, ultrasonically disperse for 15min to 60min, add dropwise ammonia water with a volume fraction of 20%, and ultrasonically disperse for 15min to 60min, A certain amount of ferric nitrate is dissolved in the solution, the molar ratio of cobalt to iron is 3:1, and a suspension containing cobalt salt, iron salt and carbon black carrier is obtained.

[0041] (2) Pour the solution into the flask, condense and reflux in a magnetically stirred oil bath, the oil bath temperature is constant, and the reaction time is 10h. After the reaction, the reaction solution is suction filtered, washed, and dried under 80°C. ℃ drying for 12h. The composite catalyst precursor solid powder is obtained.

[0042] (3) Heat-treat the obtained solid powder of the composite catalyst pr...

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Abstract

The invention relates to a carbon-supported iron-doped tricobalt tetraoxide nanocrystal composite catalyst and a preparation method thereof, belonging to the technical field of composite catalysts. The catalyst has higher oxygen precipitation reaction electrocatalytic activity and durability in the alkaline medium. Iron nitrate and ferrous sulfate are doped as iron salt precursors to obtain the controllable-shape composite catalyst. Compared with catalysts of noble metals, noble metal oxides and the like, the composite catalyst has the characteristics of low price, stable performance, simple preparation process and the like.

Description

technical field [0001] The invention relates to the field of preparation of transition metal oxide nanomaterials, in particular to an iron element doped tricobalt tetroxide catalyst and a preparation method thereof, which is applied in water electrolysis technology and belongs to the technical field of composite catalysts. Background technique [0002] As a clean, efficient and renewable energy source, hydrogen energy is considered to be the most ideal green energy source in the new world, which drives the development of energy conversion systems. Oxygen evolution reaction (OER) is the core issue of hydrogen production by electrolysis of water. Gradually attract people's attention. Due to the influence of factors such as electrode overpotential, solution and resistance in the electrolysis process, the preparation of high-efficiency catalysts has become an important problem faced by people. At present, many studies have confirmed that noble metals (Ir, Ru, Pt, Au and their a...

Claims

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Application Information

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IPC IPC(8): B01J23/75C25B11/06C25B1/04
CPCY02E60/36
Inventor 王峰蒋松李志林刘景军吉静宋夜刘海静窦美玲
Owner BEIJING UNIV OF CHEM TECH
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