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High-nickel pentlandite phase nickel and cobalt sulfide electrocatalyst for alkaline water electrolysis, and preparation method thereof

A technology of pentlandite and sulfide electricity, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, electrolysis processes, etc., can solve the problems of low catalytic performance of water electrolysis, improve electrocatalytic activity, and improve electrical conductivity Effect

Active Publication Date: 2019-09-24
JILIN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the current pentlandite phase Co 9 S 8 The problem that the water electrolysis catalytic performance in the doped Ni compound is not high, the object of the present invention is to provide a kind of high Ni content pentlandite phase Ni that is applied to water electrolysis OER and HER x co 9-x S 8 Binary metal sulfide bifunctional electrocatalyst and preparation method thereof

Method used

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  • High-nickel pentlandite phase nickel and cobalt sulfide electrocatalyst for alkaline water electrolysis, and preparation method thereof
  • High-nickel pentlandite phase nickel and cobalt sulfide electrocatalyst for alkaline water electrolysis, and preparation method thereof
  • High-nickel pentlandite phase nickel and cobalt sulfide electrocatalyst for alkaline water electrolysis, and preparation method thereof

Examples

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Effect test

Embodiment 1

[0022] In 40mL0.025mol / L Co(NO 3 ) 2 ·6H 2Add 1mL of ethylenediamine to the O solution, stir for 30 minutes, and after obtaining a complex solution, add chopped 0.1g foam nickel flakes to the mixed solution, and then add 10mL of 0.1mol / L nickel foam dropwise to the obtained mixed solution After mixing the thiourea solution, transfer the solution to a 100mL polytetrafluoroethylene hydrothermal reactor. Put the reaction kettle into a blast oven, react at 180°C for 12 hours, cool to 25°C after the reaction, take out the reaction kettle and use a centrifuge to separate the solid product, wash / centrifuge alternately for 4 times, and put the solid product into a vacuum drying at 80° C. for 12 hours in an oven to obtain the nickel-cobalt sulfide electrocatalyst of the present invention.

[0023] The phase structure of the prepared nickel-cobalt sulfide electrocatalyst is a pentlandite phase. The elemental analysis results show that the Ni / Co atomic ratio in the electrocatalyst is ...

Embodiment 2

[0029] In 80mL 0.025mol / L Co(NO 3 ) 2 ·6H 2 Add 1 mL of ethylenediamine to the O solution, stir for 30 minutes, and after obtaining a complex solution, add 0.1 g of metal nickel powder to the mixed solution, and then add 20 mL of 0.1 mol / L thiourea dropwise to the obtained mixed solution Solution, after mixing evenly, transfer the solution into a 200mL polytetrafluoroethylene-content hydrothermal reactor. Put the reaction kettle into a blast oven, react at 180°C for 12 hours, cool to 25°C after the reaction, take out the reaction kettle and use a centrifuge to separate the solid product, wash / centrifuge alternately for 4 times, and put the solid product into a vacuum drying at 80° C. for 12 hours in an oven to obtain the nickel-cobalt sulfide electrocatalyst of the present invention.

[0030] The phase structure of the prepared nickel-cobalt sulfide electrocatalyst is a pentlandite phase. The elemental analysis results show that the Ni / Co atomic ratio in the electrocatalyst...

Embodiment 3

[0032] In 80mL 0.025mol / L Co(NO 3 ) 2 ·6H 2 Add 1 mL of ethylenediamine to the O solution, stir for 30 minutes, and after obtaining a complex solution, add 0.15 g of chopped foamed nickel to the mixed solution, and then add 20 mL of 0.1 mol / L nickel Thiourea solution, after mixing evenly, transfer the solution into a 200mL polytetrafluoroethylene-content hydrothermal reactor. Put the reaction kettle into a blast oven, react at 180°C for 24 hours, cool to 25°C after the reaction, take out the reaction kettle and use a centrifuge to separate the solid product, wash / centrifuge alternately for 4 times, and put the solid product in a vacuum drying at 80° C. for 12 hours in an oven to obtain the nickel-cobalt sulfide electrocatalyst of the present invention.

[0033] The phase structure of the prepared nickel-cobalt sulfide electrocatalyst is a pentlandite phase. The elemental analysis results show that the Ni / Co atomic ratio in the electrocatalyst is 1.28, with a high Ni doping ...

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Abstract

The invention relates to a high-nickel pentlandite phase nickel and cobalt sulfide electrocatalyst for alkaline water electrolysis, and a preparation method thereof, and belongs to the technical field of alkaline water electrolysis electrode materials. The electrocatalyst of the invention is used for solving the problem of poor performances of existing pentlandite phase nickel and cobalt sulfide electrocatalysts. The preparation method of the material is characterized in that the NixCo9-xS8 binary sulfide electrocatalyst is prepared through a hydrothermal technology with a cobalt salt solution as a Co source, metal nickel as a nickel source, a small-molecular organic amine as a complexing agent and a sulfur-containing compound as a sulfur source. The electrocatalyst prepared by the method has the following structural characteristics: the phase structure is a pentlandite phase, the morphology is a spherical structure formed by assembling nanosheets, the diameter of the sphere is 200 nm to 5 [mu]m, the Ni doping proportion is high, an atomic ratio of Ni / Co is 0.78-1.28, and the exposed crystal face is a (022) crystal plane family having a hydrogenase-like structure. The pentlandite phase nickel and cobalt sulfide bifunctional electrocatalyst has a better OER electrocatalytic activity than commercial RuO2 and the close HER electrocatalytic activity to commercial Pt / C.

Description

technical field [0001] The invention belongs to the technical field of electrode materials for alkaline water electrolysis. Background technique [0002] Hydrogen energy, as a zero-emission clean energy carrier, is of great significance in the future energy field. As one of the important sources of hydrogen, hydrogen production by water electrolysis is an important clean energy technology. However, in the process of water electrolysis, the oxygen evolution reaction (Oxygen evolution reaction, OER) and the hydrogen evolution reaction (Hydrogenevolution reaction, HER) involved in the cathode and anode are kinetically controlled slow processes, which form a high overpotential and make the water The decomposition voltage of the electrolysis process is high, the electrolysis efficiency is low and the energy consumption is high. To solve the problem of high overpotentials in OER and HER processes in water electrolysis, water electrolysis devices usually require efficient electro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/043B01J35/08B01J35/10C25B1/04C25B11/06
CPCB01J27/043C25B1/04C25B11/04B01J35/33B01J35/51B01J35/61Y02E60/36
Inventor 常立民唐永福
Owner JILIN NORMAL UNIV
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