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Iron-based catalyst, preparation method and application thereof in efficient electrocatalytic water splitting

A water splitting and catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of gas bubbles not easy to overflow, limited active surface area, poor hydrophilicity, etc., and achieve low price , rich reserves, good repeatability

Active Publication Date: 2017-11-24
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among many non-precious metal catalysts, some non-precious metal catalysts have low conductivity (J.Am.Chem.Soc. 2005, Volume 127, page 5308), limited active surface area, poor stability, poor hydrophilicity, and gas bubbles are not easy to overflow. limit its excellent performance

Method used

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  • Iron-based catalyst, preparation method and application thereof in efficient electrocatalytic water splitting
  • Iron-based catalyst, preparation method and application thereof in efficient electrocatalytic water splitting
  • Iron-based catalyst, preparation method and application thereof in efficient electrocatalytic water splitting

Examples

Experimental program
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Effect test

Embodiment 1

[0031] First, add 0.095 g of thiourea into 30 mL of ethylene glycol solution (sulfur source concentration is 0.04 mol / L), stir at room temperature until completely dissolved, and become a colorless transparent solution. Put the solution into a reaction kettle, put it into iron foam (thickness 1.6mm, area 1cm*6cm), heat at 160°C for 12h, and obtain an irregular circular shape with a diameter of about 1 μm and a thickness of about 50nm on the surface of the foam iron FeS nanosheets. Then, the samples were taken out, washed with distilled water and absolute ethanol, and dried. Finally, the above sample is used as the working electrode, and the current time-curve electrochemical in-situ activation is performed, that is, the electrochemical reduction is performed for at least 20h at a voltage of 0.3V relative to the reversible hydrogen electrode, and the current tends to Stablize. Get Fe@FeO on the surface of foam iron x S y Core-shell nanoparticle iron-based water-splitting ca...

Embodiment 2

[0040] Same as Example 1, just change the sulfur source into thioacetamide (sulfur source concentration is 0.04mol / L), under 1M KOH conditions, the electrocatalytic performance of the obtained sample:

[0041] Electrocatalytic hydrogen evolution, when the overpotential is 500mV, the current density of the material reaches 1000mA / cm 2 ;

[0042] Electrocatalytic oxygen evolution, when the overpotential is 235mV, the current density of the material reaches 10mA / cm 2 .

Embodiment 3

[0044] Same as embodiment 1, just change sulfur source into sodium sulfide (sulfur source concentration is 0.04mol / L), under 1MKOH condition, the electrocatalytic performance of gained sample:

[0045] Electrocatalytic hydrogen evolution, when the overpotential is 490mV, the current density of the material reaches 1000mA / cm 2 ;

[0046] Electrocatalytic oxygen evolution, when the overpotential is 250mV, the current density of the material reaches 10mA / cm 2 .

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Abstract

Belonging to the technical field of electrocatalyst synthesis, the invention relates to an iron-based catalyst, a preparation method and application thereof in efficient electrocatalytic water splitting. The preparation method includes: firstly synthesizing FeS nanosheet by solvothermal method, and then conducting electrochemical in situ activation to obtain an Fe@FeOxSy core-shell nanoparticle iron-based catalyst. The product of the invention has excellent electrocatalytic water splitting activity and stability under an alkaline condition; electrocatalytic water splitting hydrogen evolution only needs overpotential of 510mV, and can reach an industrial grade standard level current density of 1000mA / cm<-2>; electrocatalytic water splitting oxygen evolution only needs overpotential of 240mV, and can reach a current density of 10mA / cm<-2> required by composing an alkaline electrolytic tank, the iron-based catalyst provided by the invention is far better than the current industrial noble metal catalysts, and has stability up to at least 1000h without performance attenuation. The preparation method has the advantages of simplicity, convenience and controllability, short preparation period and easy large-scale preparation. The needed raw materials have abundant reserves, are low in cost, and can replace noble metals and promote commercial application of hydrogen production by water splitting.

Description

technical field [0001] The invention belongs to the technical field of electrocatalyst synthesis, and in particular relates to a cheap iron-based catalyst, a preparation method and its application in high-efficiency electrocatalytic water splitting. Background technique [0002] In the development and research of new energy, hydrogen has attracted wide attention due to its many advantages such as high combustion value, non-polluting products and diversified utilization forms. Compared with steam methane reforming and water gas methods, electrolysis, using water as raw material, is a clean and sustainable method for producing hydrogen on a large scale. Electrochemical water splitting reactions include hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Traditional noble metals (such as Pt, Ru, Ir) and noble metal oxides (IrO 2 , RuO 2 ) catalysts have high HER and OER activities, but the high cost and scarcity of resources limit their large-scale applica...

Claims

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Application Information

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IPC IPC(8): B01J27/043C25B1/04C25B11/06
CPCC25B1/04C25B11/04B01J27/043B01J37/348B01J35/396B01J35/393Y02E60/36
Inventor 邹晓新吴园园李国栋
Owner JILIN UNIV