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High-efficiency bifunctional water decomposition electrocatalyst and preparation method thereof

A dual-function, catalyst technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of difficult to improve the electrocatalytic activity of cobalt selenide electrode materials, poor active surface area, and electron transport. Influence and other issues, to achieve good hydrogen evolution and oxygen evolution activity, good stability

Active Publication Date: 2019-11-22
INNER MONGOLIA UNIV FOR THE NATITIES
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Problems solved by technology

However, the low active surface area and poor electron transport of cobalt selenide affect its electrocatalytic water splitting activity under high current, especially the traditional hydrothermal, solution heat and high temperature selenization preparation methods are difficult to obtain high active surface area. Cobalt selenide electrode material, it is difficult to improve the electrocatalytic activity of cobalt selenide electrode material

Method used

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  • High-efficiency bifunctional water decomposition electrocatalyst and preparation method thereof
  • High-efficiency bifunctional water decomposition electrocatalyst and preparation method thereof
  • High-efficiency bifunctional water decomposition electrocatalyst and preparation method thereof

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preparation example Construction

[0029] The invention provides a method for preparing a high-efficiency dual-function hydroelectric catalyst for splitting water, including the following steps:

[0030] (1) Mix cobalt acetate, ammonium fluoride, urea and a solvent to obtain a mixed solution;

[0031] (2) Immerse the carbon cloth in the mixed solution for hydrothermal reaction to obtain the carbon cloth on which the cobalt nanorod precursor is grown on the surface;

[0032] (3) Electrochemically transforming the carbon cloth on which the cobalt nanorod precursors are grown on the surface, to obtain the high-efficiency dual-function water splitting electrocatalyst;

[0033] The electrochemical conversion adopts a three-electrode system, a carbon cloth with a cobalt nanorod precursor grown on the surface as a working electrode, a saturated calomel electrode as a reference electrode, and a mixed solution of selenium dioxide, potassium chloride and water as the working electrode. Electrolyte.

[0034] In the present inventi...

Embodiment 1

[0043] Preparation of high-efficiency dual-function hydrolysis electrocatalyst (cobalt hydroxide-cobalt selenide composite electrode):

[0044] (1) Growing cobalt nanorod precursor on the surface of carbon cloth: Dissolve 4mmol cobalt acetate, 8mmol ammonium fluoride and 20mmol urea in 105mL mixed solvent (water:ethanol volume ratio 2:1), and magnetically stir for 30 minutes. Uniform pink solution. The solution was added to a 50 mL tetrafluoroethylene lined stainless steel hydrothermal reactor with a filling volume of 70%. Then a piece of carbon cloth was added to the solution, and the reaction kettle was placed in a high-temperature oven and heated at 100°C for 10 hours. Naturally cool to room temperature, take out the carbon cloth, ultrasonically wash with deionized water and ethanol for 5 minutes, and place it in a 60°C vacuum drying oven for 2 hours.

[0045] (2) Preparation of cobalt hydroxide-cobalt selenide composite electrode by electrochemical conversion: using a three-e...

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Abstract

The invention provides a high-efficiency bifunctional water decomposition electrocatalyst and a preparation method thereof, and relates to the technical field of electrocatalytic water decomposition.The preparation method comprises the following steps: mixing cobalt acetate, ammonium fluoride, urea and a solvent to obtain a mixed solution; immersing carbon cloth into the mixed solution for hydrothermal reaction to obtain carbon cloth with a cobalt nanorod precursor growing on the surface; and then carrying out electrochemical conversion on the carbon cloth with the cobalt nanorod precursor growing on the surface to obtain the efficient bifunctional water decomposition electrocatalyst. A three-electrode system is adopted in electrochemical conversion, carbon cloth with a cobalt nanorod precursor growing on the surface serves as a working electrode, a saturated calomel electrode serves as a reference electrode, and a mixed solution of selenium dioxide, potassium chloride and water serves as an electrolyte. The electrocatalyst prepared by the invention has high hydrogen evolution activity, high oxygen evolution activity and good stability, can efficiently realize full water decomposition, and promotes the electrocatalytic water decomposition to develop towards the practical direction of higher current density and lower external potential.

Description

Technical field [0001] The present invention relates to the technical field of electrocatalytic water splitting, in particular to a high-efficiency dual-function water splitting electrocatalyst and a preparation method thereof. Background technique [0002] As a new energy conversion technology that can obtain renewable hydrogen energy, electrocatalytic water splitting technology has attracted more and more attention. The electrolysis of water consists of two half reactions: (1) the hydrogen precipitation reaction at the cathode; (2) the oxygen precipitation reaction at the anode. However, due to the poor adsorption energy of proton hydrogen and molecular oxygen on the electrode surface, a large amount of energy is consumed in the actual water electrolysis process. Therefore, the single reaction of hydrogen precipitation and oxygen precipitation is difficult to proceed, so high Active electrocatalyst to reduce the overpotential required in the reaction and accelerate the reactio...

Claims

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Application Information

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IPC IPC(8): B01J27/057B01J37/10B01J37/34B01J37/06B01J35/10B82Y30/00B82Y40/00C25B1/04C25B11/06C25B11/12
CPCB01J27/0573B01J37/10B01J37/348B01J37/343B01J37/06B82Y30/00B82Y40/00C25B1/04C25B11/051C25B11/091B01J35/39B01J35/61Y02E60/36
Inventor 王寅刘景海杨雨彤段莉梅
Owner INNER MONGOLIA UNIV FOR THE NATITIES
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