Method for preparing NiS/Ni(OH)2 electrocatalyst used for decomposing water to generate hydrogen

An electrocatalyst and water hydrogen production technology, which is applied in the direction of electrodes, electrolysis process, electrolysis components, etc., can solve the problems of complicated process and harsh operating conditions, and achieve the effects of simple operation, high reaction efficiency, and simple and easy preparation method

Active Publication Date: 2015-08-26
JIANGNAN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] However, metal sulfides are usually prepared by methods such as magnetron sputtering, chemical vapor deposition, ultrasonic synthesis, surfactant-assisted sy

Method used

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  • Method for preparing NiS/Ni(OH)2 electrocatalyst used for decomposing water to generate hydrogen
  • Method for preparing NiS/Ni(OH)2 electrocatalyst used for decomposing water to generate hydrogen
  • Method for preparing NiS/Ni(OH)2 electrocatalyst used for decomposing water to generate hydrogen

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Effect test

Embodiment 1

[0028] NiS / Ni(OH) 2 The preparation method of electrocatalyst, its concrete steps are: (1) the surface pretreatment of ITO conductive glass: ITO conductive glass is first successively soaked in dehydrated alcohol, acetone for two hours, and then in the isotropic solution of 2mol / L potassium hydroxide Heating to reflux in propanol solution for 30min. (2) Light-assisted electrokinetic deposition of NiS / Ni(OH) 2 As an electrocatalyst: Deposition of NiS / Ni(OH) on ITO electrodes by light-assisted electrokinetic deposition 2 , first configure the deposition solution, that is, 5Mm NiCl 2 ·6H 2 O and 0.3M thiourea solution. With ITO as the working electrode, Ag / AgCl (0.3M) as the reference electrode, and platinum mesh as the counter electrode, the working electrode was placed in the deposition solution, and the reference and counter electrodes were placed in Na 2 SO 4 middle. Photoassisted electrokinetic deposition was performed with cyclic voltammetry at a scan rate of 5 mV s ...

Embodiment 2

[0031] Deposition of NiS / Ni(OH) with different layers on ITO by light-assisted electrokinetic deposition 2 , to investigate its electrochemical performance under the same conditions. Using light-assisted electrokinetic deposition, 1, 3, 6, and 9 layers of Ni-S were deposited on cleaned ITO glass, respectively, and blank ITO and Pt were used as controls. The light source used is a xenon lamp (400nm), the electrochemical deposition technique is cyclic voltammetry, and the scan rate is 5mV s -1 , The scanning voltage range is -1.2V~0.2V, and the deposition solution used is a mixture of inorganic nickel salt and thiourea. The prepared electrode is used as a working electrode, Ag / AgCl (0.3M) is a reference electrode, a platinum mesh is a counter electrode, placed in a buffer solution of pH=6, and the buffer solution contains hexamethylenetetramine / hydrochloric acid Buffered KCl solution, before use with CH 4 / N 2 The mixed gas was degassed and deoxygenated, and then used to mea...

Embodiment 3

[0034] Made NiS / Ni(OH) 2 Electrode hydrogen production efficiency evaluation.

[0035] Use a mixed aqueous solution (pH=6) of 0.30mol / L hexamethylenetetramine, 0.10mol / L hydrochloric acid and 0.20mol / L potassium chloride as the electrolyte solution, and use CH 4 / N 2 The mixed gas is used for degassing and oxygen removal, the Ag / AgCl electrode is used as the reference electrode, and the platinum mesh is used as the counter electrode. The prepared NiS / Ni(OH) 2 The electrode was used as the working electrode, and the electrohydrogen experiment was done on the CHI600D electrochemical instrument. The amount of photocatalytic hydrogen production was detected by gas chromatography with a thermal conductivity detector. Electrode NiS / Ni(OH) of the present invention 2 The electrocatalytic hydrogen production efficiency under different conditions is shown in the figure.

[0036] From Figure 6 It can be seen that the hydrogen content measured by gas chromatography is roughly consi...

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Abstract

The invention discloses a method for preparing an NiS/Ni(OH)2 electrocatalyst used for decomposing water to generate hydrogen. The method comprises the steps that nickel nitrate and thiocarbamide are taken as raw materials, an optical assistance electric deposition method is adopted to obtain an NiS/Ni(OH)2 electrode through one step, and further treatment is not needed. A method for preparing the electrode is controllable in amount of coated catalysts, and the obtained electrode represents the good electrocatalytic activity under the lower overpotential, and is stable in performance; the electrode can continuously react for 22 hours in neutral electrolytes, and the current is not obviously reduced; and the faradic efficiency approaches to 100 percent, and the method can be effectively applied to the field of hydrogen generation through electrocatalysis water decomposition.

Description

technical field [0001] The invention relates to the technical field of semiconductor electrocatalytic decomposition of water to produce hydrogen, in particular to an electrocatalyst based on nickel metal sulfide and its preparation. The technology has a simple preparation process, high activity and stability, and a non-toxic and green catalyst, which can decompose water into hydrogen as a clean fuel at a low overpotential. Background technique [0002] In today's society, energy is the driving force for the development of the national economy and the basis for the country's sustainable development. However, with the vigorous development of industry and the continuous improvement of people's lives, human demand for energy is increasing day by day. However, in today's world, the excessive development and use of fossil energy has caused energy depletion and serious environmental pollution. In order to realize the sustainable development of mankind, the development and utiliza...

Claims

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Application Information

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IPC IPC(8): C25D9/04C25B1/04C25B11/06
CPCY02E60/36
Inventor 董玉明陈艳美陆可钰蒋平平王光丽赵辉
Owner JIANGNAN UNIV
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