MXene/Ni3S2 electrode and preparation method and application in electro-catalysis hydrogen preparation thereof

An electrocatalysis and electrode technology, applied in the direction of electrodes, electrolysis process, electrolysis components, etc., to achieve the effect of great application prospects

Inactive Publication Date: 2018-12-11
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ultrathin MXene nanosheets are easy to reassemble during the material preparation process, a

Method used

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  • MXene/Ni3S2 electrode and preparation method and application in electro-catalysis hydrogen preparation thereof
  • MXene/Ni3S2 electrode and preparation method and application in electro-catalysis hydrogen preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] First, 1 cm × 1 cm × 1 mm nickel foam was ultrasonicated in 6 M hydrochloric acid, acetone and deionized water for 15 min each, and then vacuum-dried at 60 °C for future use. At room temperature, 2g Ti 3 AlC 2 Slowly added to 40 ml HF solution (40wt%), magnetically stirred at 200 r / min for 24 h. Afterwards, centrifuge at 3500 r / min for 2 min, pour off the supernatant, add water and centrifuge again, and repeat this many times until the pH is about neutral. The lower precipitate was collected and dried under vacuum at 60°C. Take 0.5 g of dried precipitate and 0.25 g of CTAB in 15 mL of deoxygenated water and stir for 3 h, then add a piece of dried nickel foam to the above solution and continue stirring for 3 h. Finally, the mixed solution was transferred to a high-temperature and high-pressure reactor and reacted at 160 °C for 4 h. After natural cooling, the nickel foam was washed with deionized water and absolute ethanol and dried at 60°C to obtain the obtained sam...

Embodiment 2

[0014] First, 1 cm × 1 cm × 1 mm nickel foam was ultrasonicated in 6 M hydrochloric acid, acetone and deionized water for 15 min each, and then vacuum-dried at 60 °C for future use. At room temperature, 2g Ti 3 AlC 2 Slowly added to 40 ml HF solution (40wt%), magnetically stirred at 200 r / min for 24 h. Afterwards, centrifuge at 3500 r / min for 2 min, pour off the supernatant, add water and centrifuge again, and repeat this many times until the pH is about neutral. The lower precipitate was collected and dried under vacuum at 60°C. Take 0.5 g of dried precipitate and 0.25 g of CTAB in 15 mL of deoxygenated water and stir for 3 h, then add 6 mmol of thioacetamide and a piece of dried nickel foam to the above solution and continue to stir for 3 h. Finally, the mixed solution was transferred to a high temperature and high pressure reactor and reacted at 160° C. for 4 h. After natural cooling, the nickel foam was washed with deionized water and absolute ethanol and dried at 60 ...

Embodiment 3

[0016] First, 1 cm × 1 cm × 1 mm nickel foam was ultrasonicated in 6 M hydrochloric acid, acetone and deionized water for 15 min each, and then vacuum-dried at 60 °C for future use. At room temperature, 2g Ti 3 AlC 2 Slowly added to 40 ml HF solution (40wt%), magnetically stirred at 200 r / min for 24 h. Afterwards, centrifuge at 3500 r / min for 2 min, pour off the supernatant, add water and centrifuge again, and repeat this many times until the pH is about neutral. The lower precipitate was collected and dried under vacuum at 60°C. Take 0.5 g of dried precipitate and 0.25 g of CTAB in 15 mL of deoxygenated water and stir for 3 h, then add 9 mmol of thioacetamide and a piece of dried nickel foam to the above solution and continue to stir for 3 h. Finally, the mixed solution was transferred to a high temperature and high pressure reactor and reacted at 160° C. for 4 h. After natural cooling, the nickel foam was washed with deionized water and absolute ethanol and dried at 60 ...

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Abstract

The invention belongs to the technical field of synthesis of electro-catalysis materials, and particularly relates to an MXene/Ni3S2 electrode and a preparation method and application in electro-catalysis hydrogen preparation thereof. The preparation method comprises the following steps that 2 g of Ti3AlC2 is added into 40 ml of a 40wt% HF solution slowly, and magnetic stirring is conducted at 200r/min for 24 h; then centrifugation is conducted at 3500 r/min for 2 min, supernate is discarded, water is added for secondary centrifugation, and the step is repeated for multiple times until the pHis near neutral; a precipitate on the lower portion is collected and subjected to vacuum drying at 60 DEG C, 0.5 g of the dried precipitate and 0.25 g of CTAB are stirred in 15 mL of deoxygenated water for 3 h, and then 6-12 mmol of thioacetamide and one piece of nickel foam are added into the solution for continuous stirring for 3 h; finally, the mixed solution is transferred into a high-temperature high-pressure reaction kettle for reaction at 160 DEG C for 4 h, after natural cooling is conducted, deionized water and absolute ethyl alcohol are used for washing the nickle foam in sequence, and then the washed nickle foam is dried at 60 DEG C to obtain the MXene/Ni3S2 electrode. The MXene/Ni3S2 electrode has a low overpotential which is close to that of a commercial platinum-carbon catalyst and a low Tafel slope of 45 mV dec<1> under electric current density of 10 mV cm<2>.

Description

technical field [0001] The invention belongs to the technical field of synthesis of electrocatalytic materials, in particular to a MXene / Ni 3 S 2 Electrode and its preparation method and application in electrocatalytic hydrogen production. Background technique [0002] To meet the challenges of the global energy crisis brought about by the dwindling fossil fuels, we are working to find alternative, sustainable and renewable energy sources. Hydrogen, as an energy source with zero carbon footprint, has outstanding advantages in meeting the demands of environmental friendliness, and one of its sources is the electrocatalytic hydrogen evolution reaction. Electrolysis of water is an effective, clean and mature technical way to produce high-purity hydrogen, and finding an electrocatalyst with excellent performance is the premise. At present, the best electrocatalyst for electrocatalytic hydrogen evolution is the commercial platinum-carbon catalyst, but its large-scale applicati...

Claims

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Application Information

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IPC IPC(8): C25B11/06C25B1/04
CPCC25B1/04C25B11/051Y02E60/36
Inventor 孙剑辉禹崇菲铁璐娜谭露杨丝雨陈慧孙茹娅
Owner HENAN NORMAL UNIV
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