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NiFeMo ternary electrolytic water electrode and preparation method thereof

A technology for electrolyzing water and electrodes, applied in electrodes, electrolysis process, electrolysis components, etc., can solve the problems of unsatisfactory hydrogen evolution (HER) performance, low oxygen evolution performance, etc. The effect of low thermal reaction temperature

Active Publication Date: 2019-05-28
HUAZHONG AGRI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Long-term studies have shown that nickel-based nanomaterials have excellent catalytic performance for oxygen evolution (OER), but their performance for hydrogen evolution (HER) is not ideal.
At the same time, the latest research shows that Ni-Mo-O compound (Nature Communications 2017, 15437. Advanced Materials 2017, 1703311) nanomaterials has hydrogen evolution performance comparable to that of Pt, but its oxygen evolution performance is low
However, it is still a challenge to develop bifunctional water electrolysis materials that combine the two types of materials with high hydrogen and oxygen evolution activities.

Method used

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  • NiFeMo ternary electrolytic water electrode and preparation method thereof
  • NiFeMo ternary electrolytic water electrode and preparation method thereof
  • NiFeMo ternary electrolytic water electrode and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Weigh 0.24g of urea, 0.05g of ammonium fluoride, 0.4mmol of ferric nitrate nonahydrate, 8mmol of nickel nitrate hexahydrate and dissolve them in 40ml of deionized water. After stirring and dissolving, transfer them to a 50ml reaction kettle and add a piece of Nickel foam is heated in an oven at 100°C for 2 hours. After the end, take out the nickel foam and wash it to obtain a nickel foam material covered with a yellow-green material on the surface, put it into 40ml of ammonium heptamolybdate aqueous solution with a substance concentration of 20mmol / L, and transfer it to a 50ml reaction kettle for 10h at 120°C. After cleaning, the foam nickel material covered with brick red material is obtained. After drying, put it into the tube furnace quartz furnace tube, maintain the carbon monoxide atmosphere, raise the temperature to 350 °C at a rate of 5 °C / min and keep it for 2 hours. The material changes from brick red to 350 °C. Turned into black, the obtained NiFeMo ternary el...

Embodiment 2

[0050] Weigh 0.6g of urea, 0.2g of ammonium fluoride, 8mmol of ferric nitrate nonahydrate, and 8mmol of nickel nitrate hexahydrate in 40ml of deionized water. After stirring and dissolving, transfer it to a 50ml reaction kettle and add a piece of 0.1g of it washed with 3mol hydrochloric acid. Nickel foam, oven 100 ℃ water heating 20h. After the completion, take out the nickel foam and wash it to obtain a nickel foam material covered with a yellow-green material on the surface, put it into 40ml of ammonium heptamolybdate aqueous solution with a substance concentration of 40mmol / L, and transfer it to a 50ml reactor for 20h at 150°C. Wash to obtain the foamed nickel material of brick red material on the surface after finishing, put into tube furnace quartz furnace tube after drying, maintain 5% (5% V H2 / 95%V Ar ) mixed atmosphere of hydrogen and argon, the temperature was raised to 300°C at a rate of 5°C / min and kept for 10h, the material changed from brick red to black, and th...

Embodiment 3

[0052] Weigh 0.6g of urea, 0.2g of ammonium fluoride, 0.4mmol of ferric nitrate nonahydrate, 5mmol of nickel nitrate hexahydrate in 40ml of deionized water, stir and dissolve, transfer to a 50ml reaction kettle and add a piece of 0.6g to wash with 3mol hydrochloric acid For nickel foam, heat in water at 120°C for 12 hours in an oven. After the end, take out the nickel foam and wash it to obtain a nickel foam material covered with a yellow-green material on the surface, put it into 40ml of ammonium heptamolybdate aqueous solution with a substance concentration of 10mmol / L, and transfer it to a 50ml reactor for 120°C hydrothermal heating for 10h. Wash to obtain the foamed nickel material of brick red material on the surface after finishing, put into tube furnace quartz furnace tube after drying, maintain 5% (5% V H2 / 95%V Ar ) in a mixed atmosphere of hydrogen and argon, the temperature was raised to 400°C at a rate of 5°C / min and kept for 2 hours, the material turned from bric...

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Abstract

The invention discloses an NiFeMo ternary electrolytic water electrode and a preparation method thereof. Firstly, iron salt, nickel salt, urea and NH4F are used as raw materials under a low-temperature hydrothermal condition to prepare NiFe-LDH / NF, then NiFe-LDH / NF and a compound containing molybdenum are subjected to a low-temperature hydrothermal reaction to obtain Ni-Fetrace@NFM / NF, then Ni-Fetrace@NFM / NF is placed in a flowing reducing atmosphere for heat treatment for a certain time, and a final material of Ni / NiFeMoOx / NF is obtained; and in the process, an LDH substrate is reduced to Ninanoparticles, and mutually cross-linked with NiFe-MoOx generated by reduced molybdate to form a composite material with a hierarchical porous nanosheet structure. The hierarchical porous nanosheet structure facilitates bubble diffusion, a formed alloy is cross-linked with MoOx and combined with a conductive substrate to have excellent electrical conductivity, and in the way, the material has excellent reaction kinetics; and NiFe-MoOx with the high hydrogen evolution activity and the Ni nanoparticles with the high hydrogen evolution activity both endows the material with excellent hydrogen andoxygen evolution properties, and then catalytic performance of all electrolytic water with application prospects is obtained.

Description

technical field [0001] The invention relates to an electrolytic water electrode and a preparation method thereof, in particular to a NiFeMo ternary electrolytic water electrode and a preparation method thereof. Background technique [0002] The depletion of fossil energy and the resulting environmental degradation make it urgent for human beings to seek new energy to replace it. Hydrogen energy is one of the energy sources with the most development potential. Its utilization forms are diverse and environmentally friendly, so it is currently a hot research topic and even a long-term plan in various countries. The production of hydrogen is the primary prerequisite for the utilization of hydrogen energy. However, the main source of hydrogen is still fossil fuels. Therefore, it is of great significance to develop renewable hydrogen production methods. Hydrogen production by electrolysis of water has many advantages such as high conversion efficiency, simple process, and high pu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/04C25B11/03C25B11/06B82Y40/00
CPCY02E60/36
Inventor 张耕曹菲菲李勇科
Owner HUAZHONG AGRI UNIV
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