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Core-shell-shaped copper selenide and ferronickel hydrotalcite electrocatalyst and preparation method and water electrolysis application thereof

A technology of copper selenide and catalyst, applied in the field of electrocatalysis, to achieve the effect of uniform size, good mechanical stability and thin sheet

Active Publication Date: 2020-11-06
保时来新材料科技(苏州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention optimizes the deposition conditions by controlling the deposition time, the concentration and ratio of electrolyte metal ions, and tests the electrochemical performance of CuSe@NiFe-LDH with different deposition times to compare and analyze the influence of deposition time on the catalyst morphology and catalytic performance. ; Cu prepared by different metal ion concentrations 2 Se@NiFe-LDH performance test, comparative analysis of the influence of metal ion concentration on catalyst morphology and catalytic performance; Cu prepared by different metal ion ratios 2 Se@NiFe-LDH performance test, comparative analysis of the effect of metal ion ratio on catalyst morphology and catalytic performance, the best conditions for electrodeposition were obtained, and core-shell Cu 2 Se@NiFe-LDH electrode material, and its electrolytic water performance has been systematically studied, and related research work has not been reported yet.

Method used

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  • Core-shell-shaped copper selenide and ferronickel hydrotalcite electrocatalyst and preparation method and water electrolysis application thereof
  • Core-shell-shaped copper selenide and ferronickel hydrotalcite electrocatalyst and preparation method and water electrolysis application thereof
  • Core-shell-shaped copper selenide and ferronickel hydrotalcite electrocatalyst and preparation method and water electrolysis application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1)Cu 2 Preparation of Se / CF

[0035] Soak the commercial copper foam with a specification of 3cm×4cm in a hydrochloric acid solution with a concentration of 37% for 10 minutes, and wash it several times with deionized water and absolute ethanol; put the cleaned foam copper into 80mL NaOH and (NH 4 ) 2 S 2 o 8 Soaked in the mixed solution for 20min to grow light blue Cu(OH) on the surface in situ 2 nanowires, grown with Cu(OH) 2 The copper foam of the nanowires was rinsed with deionized water, and dried in an oven at 60 °C for 6 h; the dried Cu(OH) 2 The nanowires are placed in a tube furnace, and 0.1g of selenium powder is placed at the front of the tube furnace, and the temperature is raised to 400 °C at a rate of 5 °C / min in a nitrogen atmosphere, and kept for 30 min. After the tube furnace cools down naturally, the sample is taken out , washed several times with deionized water and ethanol to obtain Cu 2 Se / CF, dry for later use;

[0036] (2)Cu 2 Preparatio...

Embodiment 2

[0039] (1)Cu 2 Preparation of Se / CF

[0040] Prepare with reference to the method and conditions of step (1) in Example 1.

[0041] (2)Cu 2 Preparation of Se@NiFe-LDH / CF

[0042] Referring to the method and preparation conditions of step (2) in Example 1, the electrodeposition time was set to 60s to obtain copper selenide@nickel-iron hydrotalcite nanosheet electrocatalyst, denoted as Cu 2 Se@Ni 2 / 3 Fe 1 / 3 - LDH / CF-60;

Embodiment 3

[0044] (1)Cu 2 Preparation of Se / CF

[0045] Prepare with reference to the method and conditions of step (1) in Example 1.

[0046] (2)Cu 2 Preparation of Se@NiFe-LDH / CF

[0047] Referring to the method and preparation conditions of step (2) in Example 1, the electrodeposition time was set to 90s to obtain copper selenide@nickel-iron hydrotalcite nanosheet electrocatalyst, denoted as Cu 2 Se@Ni 2 / 3 Fe 1 / 3 - LDH / CF-90;

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Abstract

The invention discloses a core-shell-shaped Cu2Se (at) NiFe-LDH electrocatalyst and a preparation method and application thereof. Firstly, foamy copper is used as a substrate; Cu (OH) 2 nanowires aregrown on the surface of an alkaline medium in situ through a chemical oxidation method; the copper selenide nanowire is converted into a copper selenide nanowire in a tubular furnace by using seleniumpowder, ferronickel hydrotalcite nanosheets grow on the surface of the copper selenide nanowire by adopting an electrodeposition method, and the core-shell-shaped copper selenide and ferronickel hydrotalcite nanosheet electrocatalyst is prepraed by adopting a vapor-phase selenization and electrodeposition two-step. The obtained core-shell-shaped copper selenide and nickel-iron hydrotalcite nanosheet catalyst is in a nanowire shape, and the diameter of the catalyst is 150-250 nm; Cu2Se is used as a core, a NiFe-LDH sheet is used as a shell, and the thickness of the NiFe-LDH sheet is smaller than 10 nm; the oxygen evolution reaction, the hydrogen evolution reaction and the total water splitting catalytic activity of the nickel-iron hydrotalcite nanosheet in a 1mol / L KOH electrolyte solutionare higher than those of nickel-iron hydrotalcite nanosheets and composite materials thereof prepared by other traditional methods.

Description

Technical field: [0001] The invention relates to a core-shell copper selenide@nickel-iron hydrotalcite (Cu 2 Se@NiFe-LDH) electrocatalyst and its preparation method, and the present invention relates to the core-shell copper selenide@nickel-iron hydrotalcite electrocatalyst obtained by the preparation method for oxygen evolution reaction (OER) and hydrogen evolution reaction ( HER) belongs to the field of electrocatalysis. Background technique: [0002] Electrolysis of water is of great significance to reduce the demand for fossil energy and protect the environment. However, in acidic and alkaline electrolytes, electrolysis of water needs to break the O-H bond and release electrons to form O=O double bond. This kinetic process is very slow and usually requires a potential higher than 1.23V, that is, a large overpotential. Therefore, highly active catalysts are required to reduce the overpotential for efficient water splitting. Oxygen evolution reaction (OER) is the bottle...

Claims

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Application Information

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IPC IPC(8): B01J27/057B01J35/00B01J37/34C25B1/04C25B11/06
CPCB01J37/348B01J27/0573C25B1/04C25B11/04B01J35/33B01J35/397Y02E60/36
Inventor 詹天荣臧昊张朋温永红陈璐瑶王泽琨王磊
Owner 保时来新材料科技(苏州)有限公司
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