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Carbon interlayer copper nanosheet electrocatalyst with sandwich structure, preparation method, electrode and application

An electrocatalyst and copper nanotechnology, applied in the field of electrocatalysis, can solve the problems of rapid deactivation of metal copper catalysts, and achieve the effects of improving reduction efficiency, preventing oxidation, and promoting rate-limiting steps

Pending Publication Date: 2021-08-10
BEIJING AEROSPACE PROPULSION INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some progress has been made in the design of copper catalysts, the rapid deactivation of metallic copper catalysts is still a major problem

Method used

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  • Carbon interlayer copper nanosheet electrocatalyst with sandwich structure, preparation method, electrode and application
  • Carbon interlayer copper nanosheet electrocatalyst with sandwich structure, preparation method, electrode and application
  • Carbon interlayer copper nanosheet electrocatalyst with sandwich structure, preparation method, electrode and application

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preparation example Construction

[0034] According to a second aspect of the present invention, a method for preparing a sandwich-structured carbon interlayer copper nanosheet electrocatalyst is provided, comprising the steps of:

[0035] Step 1, dissolve the soluble copper salt and the reducing agent in the reaction vessel with water, stir evenly, add cetyltrimethylammonium bromide (CTAB) and hexamethamine (HMTA), and react for at least 30 minutes. The container is sealed, and then from room temperature to 2 ~ 4 ℃ · min -1 The speed is raised to 80-90°C to continue the reaction, preferably at 80-90°C for 3-4 hours, then cooled to room temperature, and the obtained product copper nanosheets are dispersed in ethanol solution for subsequent use after centrifugal cleaning;

[0036] Step 2, pouring the prepared copper nanosheets into the tirs-HCl dopamine buffer solution, stirring to cause self-polymerization of dopamine on the copper nanosheets, after the reaction is completed, the product is centrifugally cleane...

Embodiment 1

[0050] Take 50mg of copper nitrate trihydrate (Cu(NO 3 ) 2 ·3H 2 0), 100 mg vitamin C and 15 mL deionized water were added to a 20 mL reaction vessel. It was uniformly mixed using magnetic stirring, and then 100 mg of cetyltrimethylammonium bromide (CTAB) and 100 mg of urotropine (HMTA) were added. After 30 minutes of reaction, the reaction vessel was sealed, and then from room temperature at 2°C min -1 The speed was raised to 80°C, and the reaction was carried out at 80°C for 3 hours. Finally, the room temperature was cooled, and the obtained product was washed by centrifugation, and dispersed in an ethanol solution for later use.

[0051] Pour the prepared copper nanosheets (20mg) into 30mL tirs-HCl dopamine (3mg·mL -1 ) in the buffer solution, the magnetic speed allows dopamine to self-polymerize through magnetic stirring (1500 rpm), and the reaction time is recorded as 1 hour. After self-polymerization, the product was centrifuged and cleaned, and then placed in an o...

Embodiment 2～4

[0053] Embodiments 2 to 4 are the same as Embodiment 1, except that the time for self-polymerization of dopamine is different, which are 2, 3 and 4 hours respectively.

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Abstract

The invention provides a carbon interlayer copper nanosheet electrocatalyst with a sandwich structure, a preparation method, an electrode and application. A middle layer of the electrocatalyst is a copper nanosheet, and the average thickness of the copper nanosheet is 3-4 nm; and graphene-like layers are arranged on the two sides of the copper nanosheet, and the average thickness of the graphene-like layers is 0.8-4.3 nm. The preparation method comprises the following steps: preparing copper nanosheets, pouring the copper nanosheets into a tirs-HCl dopamine buffer solution to generate a self-polymerization reaction, centrifugally cleaning a product after the reaction is completed, and then drying the product in a dryer; and putting the dried product into a high-temperature furnace in which argon shielding gas is introduced, conducting heating at 450-600 DEG C for at least 1 hour, then conducting heating to 900-1000 DEG C, conducting reacting for at least 5 minutes, and conducting cooling to room temperature within 15 minutes after the reaction is completed, thereby obtaining the carbon interlayer copper nanosheet with the sandwich structure. The carbon sandwich structure provided by the invention can prevent the copper nanosheet with high reaction activity from being oxidized in the atmosphere, and shows excellent catalytic performance in the process of selectively and electrochemically reducing CO2 into CH4.

Description

technical field [0001] The invention belongs to the technical field of electrocatalysis, and in particular relates to a sandwich-structured carbon interlayer copper nanosheet electrocatalyst, a preparation method, an electrode and an application. Background technique [0002] Using electricity generated from renewable energy sources, the CO 2 Electrochemical reduction into chemicals and fuels with high energy density is a promising sustainable energy strategy. However, CO 2 Very stable, electrocatalytic reduction of CO 2 Reaction (CO 2 RR) requires high energy input and requires a high overpotential. To achieve high-performance electrocatalytic reduction of CO 2 , researchers need to design efficient electrochemical catalysts to reduce CO 2 Energy barrier for the activation process. in the existing CO 2 Among electrochemical catalysts, copper is one of the most widely studied materials. In order to enhance the catalytic activity and control the product selectivity, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/091C25B11/054C25B3/03C25B3/26B22F1/00B22F1/02B22F9/24B82Y30/00B82Y40/00
CPCB22F9/24B82Y30/00B82Y40/00B22F1/0551B22F1/054B22F1/07B22F1/16
Inventor 倪伟章丹亭张娜马骁申帅帅赵梦芸梁怡琪
Owner BEIJING AEROSPACE PROPULSION INST
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