Preparation method of molybdenum-doped cobalt-iron oxide nano-sheet 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: 2019-09-13
TAIYUAN UNIV OF TECH
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  • 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 molybdenum-doped cobalt-iron oxide nano-sheet bifunctional electrocatalyst
  • Preparation method of molybdenum-doped cobalt-iron oxide nano-sheet bifunctional electrocatalyst
  • Preparation method of molybdenum-doped cobalt-iron oxide nano-sheet 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 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) added to 36 mL of ultrapure water, stirred until completely dissolved, in which 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 O molar x / y / z ratio is 1:1:1.2.

[0028] Then, this solution and the nickel foam as the substrate material were transferred into a 50 mL polytetrafluoroethylene-lined stainless steel autoclave, which was sealed and heated at 180 °C for 10 h, and then naturally cooled to room temperature. The product was washed several times with ultrapure water and absolute ethanol, dried under vacuum at 60°C, and finally annealed at 800°C for 2 hours. 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 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 )6 Mo 7 o 24 4H 2 O) added to 36 mL of ultrapure water, stirred until completely dissolved, in which 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 O molar x / y / z ratio is 1:1:1.8.

[0032] Then, this solution and the nickel foam as the substrate material were transferred into a 50 mL polytetrafluoroethylene-lined stainless steel autoclave, which was sealed and heated at 180 °C for 10 h, and then naturally cooled to room temperature. The product was washed several times with ultrapure water and absolute ethanol, dried under vacuum at 60°C, and finally annealed at 800°C for 2 hours. 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 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) added to 36 mL of ultrapure water, stirred until completely dissolved, in which 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 O molar x / y / z ratio is 1:1:2.4.

[0036] Then, this solution and the nickel foam as the substrate material were transferred into a 50 mL polytetrafluoroethylene-lined stainless steel autoclave, which was sealed and heated at 180 °C for 10 h, and then naturally cooled to room temperature. The product was washed several times with ultrapure water and absolute ethanol, dried under vacuum at 60°C, and finally annealed at 800°C for 2 hours. 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 electrocatalyst and discloses a preparation method of a molybdenum-doped cobalt-iron oxide nano-sheet bifunctional electrocatalyst. Specifically, Co(NO3)2.6H2O, Fe(NO3)2.9H2O and (NH4)6Mo7O24.4H2O, urea and NH4F are added to water to form a solution according to the molar ratio of 1:1:0.001-1:1:3, the solution and the substrate material are transferred to an autoclave, and CoxFeyMozO NSs is hydrothermally synthesized, which can be used as high-efficiency electrocatalyst in the process of electrochemical decomposition of water; theultrathin nanostructure of that present invention has a large specific surface area, and also has excellent charge transfer capability and a large number of active sites, the CoxFeyMozO NSs has excellent OER and HER activity and long-term cycle durability. The method of the invention has the advantages of low cost and easy operation, and is beneficial to popularization and application.

Description

technical field [0001] The invention belongs to the technical field of two-dimensional electrocatalyst preparation, and specifically relates to a method for preparing a molybdenum-doped cobalt-iron oxide nanosheet bifunctional electrocatalyst. Background technique [0002] In recent years, due to environmental pollution and energy crisis, reducing the dependence on traditional energy sources (fossil fuels) and exploring renewable and sustainable energy sources for human society has 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 aspects, the anodic oxygen evolution reaction and the cathodic 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 evolution rea...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/10B01J35/10B82Y30/00B82Y40/00C25B1/04C25B11/06
CPCB01J27/24B01J37/10B82Y30/00B82Y40/00C25B1/04C25B11/091B01J35/33B01J35/61Y02E60/36
Inventor 郭俊杰裴林媛宋艳慧许并社
Owner TAIYUAN UNIV OF TECH
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