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Core-shell copper selenide@nickel-iron-based hydrotalcite electrocatalyst, preparation method and water electrolysis application

A technology of copper selenide and catalyst, which is applied in the field of electrocatalysis to achieve the effect of thin sheet, improved catalytic performance and large specific surface area

Active Publication Date: 2022-06-28
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 copper selenide@nickel-iron-based hydrotalcite electrocatalyst, preparation method and water electrolysis application
  • Core-shell copper selenide@nickel-iron-based hydrotalcite electrocatalyst, preparation method and water electrolysis application
  • Core-shell copper selenide@nickel-iron-based hydrotalcite electrocatalyst, preparation method and water electrolysis application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0035] Immerse commercial copper foam with a size of 3cm×4cm in a 37% hydrochloric acid solution for 10 minutes, and wash it with deionized water and absolute ethanol for several times; put the cleaned copper foam into 80mL of NaOH and (NH) 4 ) 2 S 2 O 8 Soak in the mixed solution for 20min to grow light blue Cu(OH) on the surface in situ 2 Nanowires, taken out grown with Cu(OH) 2 The foamed copper 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 were placed in a tube furnace, and at the same time, 0.1 g of selenium powder was placed in the front end of the tube furnace, and the temperature was raised to 400 °C at a rate of 5 °C / min in a nitrogen atmosphere, maintained for 30 min, and the sample was taken out after the tube furnace was naturally cooled. , rinsed with deionized water and ethanol several times to obtain Cu 2 Se / CF, dry for later use;

[0036] (2)...

Embodiment 2

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

[0040] Prepare according 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@NiFe 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 according 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 Cu 2 Se@NiFe‑LDH electrocatalyst and its preparation method and application. First, copper foam is used as the substrate, and Cu(OH) is grown in situ on the surface by chemical oxidation in alkaline medium. 2 Nanowires, then selenized with selenium powder in a tube furnace to transform into copper selenide nanowires, and finally use electrodeposition method to grow nickel-iron hydrotalcite nanosheets on its surface, and prepare by gas phase selenization and electrodeposition two-step method Core-shell copper selenide@nickel iron hydrotalcite nanosheet electrocatalyst. The obtained core-shell copper selenide@nickel-iron hydrotalcite nanosheet catalyst is in the shape of a nanowire with a diameter of 150-250nm; 2 Se is the core, with NiFe-LDH flakes as the shell, and the thickness of NiFe-LDH flakes is less than 10nm; its catalytic activity of oxygen evolution reaction, hydrogen evolution reaction and total water splitting in 1mol / L KOH electrolyte solution is higher than that of nickel prepared by other traditional methods Iron hydrotalcite nanosheets and their composites.

Description

Technical field: [0001] The invention relates to a core-shell copper selenide@nickel-iron hydrotalcite (Cu 2 Se@NiFe-LDH) electrocatalyst and preparation method thereof, and the invention relates to core-shell copper selenide@nickel-iron hydrotalcite electrocatalyst obtained by the preparation method for oxygen evolution reaction (OER) and hydrogen evolution reaction (OER) and hydrogen evolution reaction (OER) under alkaline conditions. HER), which belongs to the field of electrocatalysis. Background technique: [0002] Electrolyzed water is of great significance for reducing petrochemical energy demand and protecting the environment. However, in acidic and alkaline electrolytes, the electrolysis of water requires breaking the O-H bond and releasing electrons to form the O=O double bond. This kinetic process is very slow and usually requires a potential higher than 1.23 V, that is, a large overpotential. Therefore, highly active catalysts are required to reduce overpotenti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/057B01J35/00B01J37/34C25B1/04C25B11/091
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