Preparation method of a molybdenum-doped cobalt-iron oxide nanosheet bifunctional electrocatalyst

A technology of cobalt iron oxide and electrocatalyst, which is applied in the field of two-dimensional electrocatalyst preparation, can solve the problems of restricting large-scale application and high cost, and achieve excellent OER activity and stability, easy operation, and excellent long-term cycle durability. Effect

Active Publication Date: 2022-05-24
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the oxygen evolution catalysts and hydrogen evolution catalysts with low overpotential and Tafel slope are noble metal oxides (IrO 2 or RuO 2 ) and Pt-based compounds, but the scarcity and high cost of these noble metals limit their large-scale application

Method used

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  • Preparation method of a molybdenum-doped cobalt-iron oxide nanosheet bifunctional electrocatalyst
  • Preparation method of a molybdenum-doped cobalt-iron oxide nanosheet bifunctional electrocatalyst
  • Preparation method of a molybdenum-doped cobalt-iron oxide nanosheet bifunctional electrocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Co 1 Fe 1 Mo 1.2 Preparation of O NSs

[0027] First, 1 mmol of cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O), 1 mmol ferric nitrate nonahydrate (Fe(NO) 3 ) 2 ·9H 2 O), 5 mmol urea and 4 mmol NH 4 F, and 1.2 mmol of ammonium molybdate tetrahydrate ((NH 4 ) 6 Mo 7 O 24 ·4H 2 O) was added to 36 mL of ultrapure water, stirred until completely dissolved, where Co(NO 3 ) 2 ·6H 2 O, Fe (NO 3 ) 2 ·9H 2 O and (NH 4 ) 6 Mo 7 O 24 ·4H 2 O molar amount x / y / z ratio is 1:1:1.2.

[0028] Then, this solution and nickel foam as the base material were transferred into a 50 mL Teflon-lined stainless steel autoclave, which was sealed, heated at 180 °C for 10 h, and naturally cooled to room temperature. The product was washed several times with ultrapure water and absolute ethanol, vacuum dried at 60 °C, and finally annealed at 800 °C for 2 h. The resulting product is denoted as Co 1 Fe 1 Mo 1.2 O NSs@NF.

Embodiment 2

[0030] Co 1 Fe 1 Mo 1.8 Preparation of O NSs

[0031] First, 1 mmol of cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O), 1 mmol ferric nitrate nonahydrate (Fe(NO) 3 ) 2 ·9H 2 O), 5 mmol urea and 4 mmol NH 4 F, and 1.8 mmol of ammonium molybdate tetrahydrate ((NH 4 ) 6Mo 7 O 24 ·4H 2 O) was added to 36 mL of ultrapure water, stirred until completely dissolved, where Co(NO 3 ) 2 ·6H 2 O, Fe (NO 3 ) 2 ·9H 2 O and (NH 4 ) 6 Mo 7 O 24 ·4H 2 O molar amount x / y / z ratio is 1:1:1.8.

[0032] Then, this solution and nickel foam as the base material were transferred into a 50 mL Teflon-lined stainless steel autoclave, which was sealed, heated at 180 °C for 10 h, and naturally cooled to room temperature. The product was washed several times with ultrapure water and absolute ethanol, vacuum dried at 60 °C, and finally annealed at 800 °C for 2 h. The resulting product is denoted as Co 1 Fe 1 Mo 1.8 O NSs@NF.

Embodiment 3

[0034] Co 1 Fe 1 Mo 2.4 Preparation of O NSs

[0035] First, 1 mmol of cobalt nitrate hexahydrate (Co(NO 3 ) 2 ·6H 2 O), 1 mmol ferric nitrate nonahydrate (Fe(NO) 3 ) 2 ·9H 2 O), 5 mmol urea and 4 mmol NH 4 F, and 2.4 mmol of ammonium molybdate tetrahydrate ((NH 4 ) 6 Mo 7 O 24 ·4H 2 O) was added to 36 mL of ultrapure water, stirred until completely dissolved, where Co(NO 3 ) 2 ·6H 2 O, Fe (NO 3 ) 2 ·9H 2 O and (NH 4 ) 6 Mo 7 O 24 ·4H 2 The 0 molar amount x / y / z ratio is 1:1:2.4.

[0036] Then, this solution and nickel foam as the base material were transferred into a 50 mL Teflon-lined stainless steel autoclave, which was sealed, heated at 180 °C for 10 h, and naturally cooled to room temperature. The product was washed several times with ultrapure water and absolute ethanol, vacuum dried at 60 °C, and finally annealed at 800 °C for 2 h. The resulting product is denoted as Co 1 Fe 1 Mo 2.4 O NSs@NF.

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Abstract

The invention relates to the technical field of two-dimensional electrocatalysts, and discloses a method for preparing molybdenum-doped cobalt-iron oxide nanosheet bifunctional electrocatalysts; specifically, Co( NO 3 ) 2 ·6H 2 O, Fe(NO 3 ) 2 9H 2 O and (NH 4 ) 6 Mo 7 o 24 4H 2 O, and urea, NH 4 F was added to water to form a solution, and the solution and base material were transferred to an autoclave for hydrothermal synthesis of Co x Fe y Mo z O NSs, which can be used as high-efficiency electrocatalysts in the electrochemical water splitting process; the ultrathin nanostructures of the present invention have a large specific surface area, and also have excellent charge transport ability and a large number of active sites, Co x Fe y Mo z O NSs exhibit excellent OER and HER activities and long-term cycling durability. The method of the invention is low in cost, easy to operate and beneficial to popularization and application.

Description

technical field [0001] The invention belongs to the technical field of two-dimensional electrocatalyst preparation, in particular to a preparation method of a molybdenum-doped cobalt-iron oxide nanosheet bifunctional electrocatalyst. Background technique [0002] In recent years, due to environmental pollution and energy crisis, reducing dependence on traditional energy sources (fossil fuels) and exploring renewable and sustainable energy sources for human society have become one of the most pressing challenges. Electrochemical water splitting as a way to provide clean and sustainable energy includes the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER), however, from both thermodynamic and kinetic perspectives, the anodic oxygen evolution reaction and the cathodic evolution reaction The huge overpotential of the hydrogen evolution reaction is a key problem to improve the energy conversion efficiency. In particular, the slow kinetics of the oxygen ev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J37/10B01J35/10B82Y30/00B82Y40/00C25B1/04C25B11/091
CPCB01J27/24B01J37/10B01J35/0033B01J35/1004B82Y30/00B82Y40/00C25B1/04C25B11/091Y02E60/36
Inventor 郭俊杰裴林媛宋艳慧许并社
Owner TAIYUAN UNIV OF TECH
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