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Three-dimensional cobaltous sulfide oxygen evolution electrode preparation method based on electrodepositing technology and electrode prepared through method

An oxygen evolution electrode, cobalt sulfide technology, applied in electrodes, electrolysis process, electrolysis components, etc., can solve the problems of inability to realize three-dimensional electrode construction, high energy consumption, achieve excellent catalytic performance and stability, simple preparation method, and environmental friendliness Effect

Inactive Publication Date: 2018-09-28
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the commonly used methods for preparing cobalt sulfide materials are high-temperature conversion method or hydrothermal method, but these preparation methods consume high energy and cannot realize the construction of three-dimensional electrodes.

Method used

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  • Three-dimensional cobaltous sulfide oxygen evolution electrode preparation method based on electrodepositing technology and electrode prepared through method
  • Three-dimensional cobaltous sulfide oxygen evolution electrode preparation method based on electrodepositing technology and electrode prepared through method
  • Three-dimensional cobaltous sulfide oxygen evolution electrode preparation method based on electrodepositing technology and electrode prepared through method

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preparation example Construction

[0031] A three-dimensional cobalt sulfide oxygen precipitation electrode based on electrodeposition technology and a preparation method thereof, comprising the following steps:

[0032] 1) Cobalt salt and thiocyanate are dissolved in water, and mixed solution is prepared; the cobalt salt is at least one of cobalt chloride, cobalt nitrate, cobalt sulfate or cobalt acetate; the thiocyanate is sulfur At least one of sodium cyanate, potassium thiocyanate or ammonium thiocyanate; the concentration of cobalt salt is 0.01-0.50 mol / L, and the concentration of thiocyanate is 0.04-2.0 mol / L.

[0033] 2) The aqueous solution prepared in step 1) is used as an electrolyte, and the conductive substrate is used as an electrode, and cobalt sulfide material is grown on the conductive substrate by electrodeposition technology. The conductive substrate is nickel mesh, titanium mesh, titanium sheet, copper sheet or stainless steel sheet, with an area of ​​0.2×0.2cm 2 ~1.0×1.0cm 2 . The electro...

Embodiment 1

[0036] The three-dimensional cobalt sulfide oxygen precipitation electrode based on the electrodeposition technology of this embodiment and its preparation method comprise the following steps:

[0037] 1) Dissolving cobalt sulfate and potassium thiocyanate in water, the concentrations of cobalt sulfate and potassium thiocyanate are respectively 0.05mol / L and 0.2mol / L;

[0038] 2) Use the aqueous solution prepared in step 1) as the electrolyte solution, and use 0.5×0.5cm 2 The titanium sheet was used as the conductive substrate, and the cobalt sulfide material was grown on the conductive substrate by the chronoamperometry method, and the control potential was -0.95V ( 参照 saturated calomel electrode), the time is 1200s;

[0039] 3) The three-dimensional cobalt sulfide oxygen precipitation electrode prepared in step 2) was washed 10 times with pure water, and then dried at room temperature for 8 hours.

[0040] figure 1 The scanning electron microscope image of the three-dimen...

Embodiment 2

[0045] The three-dimensional cobalt sulfide oxygen precipitation electrode based on the electrodeposition technology of this embodiment and its preparation method comprise the following steps:

[0046]1) Cobalt chloride and sodium thiocyanate are dissolved in water, and the concentrations of cobalt chloride and sodium thiocyanate are respectively 0.03mol / L and 0.12mol / L;

[0047] 2) Use the aqueous solution prepared in step 1) as the electrolyte, and use 0.3×0.3cm 2 The nickel mesh is used as the conductive substrate, and the cobalt sulfide material is grown on the conductive substrate by the chronopotentiometry method, and the current density is controlled at 1.5mA / cm 2 , the time is 600s;

[0048] 3) The three-dimensional cobalt sulfide oxygen precipitation electrode prepared in step 2) was washed 5 times with pure water, and then dried at room temperature for 20 hours.

[0049] Figure 4 The scanning electron microscope image of the three-dimensional cobalt sulfide oxyge...

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Abstract

The invention relates to an electrolytic water oxygen evolution electrode and a preparation method thereof, in particular to a three-dimensional cobaltous sulfide oxygen evolution electrode and a preparation method thereof based on an electrodepositing technology. The method comprises the following steps that (1) cobalt salt and thiocyanate are dissolved in water, and a mixed solution is prepared;and (2) the aqueous solution prepared in the step (1) is used as an electrolyte, a conductive substrate is used as an electrode, a cobaltous sulfide material is grown on the conductive substrate through the electrodepositing technology, and prepared cobaltous sulfide is taken out, washed and dried. The three-dimensional cobaltous sulfide oxygen evolution electrode is prepared on the conductive substrate through the electrodepositing technology with simple steps and mild conditions. The oxygen evolution electrode has a microscopic morphology of a three-dimensional structure and has high reaction specific surface area so that more active sites can be exposed in an electrolyte solution to participate in an oxygen evolution reaction, and transmission of electrons and rapid escape of oxygen bubbles in the catalytic process are facilitated, so that the oxygen evolution electrode has good oxygen evolution catalytic performance and stability.

Description

technical field [0001] The invention relates to an electrolytic water oxygen precipitation electrode and a preparation method thereof, in particular to a three-dimensional cobalt sulfide oxygen precipitation electrode based on electrodeposition technology and a preparation method thereof. Background technique [0002] Electrolysis of water is an important method for producing hydrogen, and oxygen evolution reaction is an important part of electrolysis of water. However, the oxygen evolution reaction involves four electron transfer steps with extremely sluggish kinetics at the electrode, resulting in an increased overpotential for oxygen evolution, which results in severe energy loss during electrolysis and makes hydrogen production prohibitively expensive. Therefore, efficient electrodes are required to reduce the overpotential of the oxygen evolution reaction. Iridium and its oxide materials are currently the most commonly used electrodes in the oxygen evolution reaction, ...

Claims

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Application Information

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IPC IPC(8): C25B11/06C25B1/04C25D9/04
CPCC25B1/04C25D9/04C25B11/051C25B11/075Y02E60/36
Inventor 李长明南开开杜洪方苏兰
Owner SOUTHWEST UNIVERSITY
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