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Electrode for electrochemical reduction of carbon dioxide and application thereof

A carbon dioxide, electrochemical technology, applied in electrodes, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problems of unclear selectivity and active mechanism, and achieve smooth products/reactions The effect of mass transfer channel, improving selectivity, and promoting diffusion

Active Publication Date: 2020-09-18
DALIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Studies have shown that Cu 2 O is beneficial to the formation of ethylene, ethanol and other products, but the selectivity and activity mechanism of the Cu oxide content on the product is still unclear; how to ensure the conductivity and high defect active sites of the catalyst by adjusting the parameters in the preparation process , in order to realize the controllable orientation and shape of the product, it needs to be further explored

Method used

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  • Electrode for electrochemical reduction of carbon dioxide and application thereof
  • Electrode for electrochemical reduction of carbon dioxide and application thereof
  • Electrode for electrochemical reduction of carbon dioxide and application thereof

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preparation example Construction

[0031] An electrode for electrochemical reduction of carbon dioxide and its application, including a catalyst, the catalyst is an ordered core-shell catalyst, and the catalyst is Cu-vacancy copper / Cu 2 O, where Cu-vacancy copper is the shell, and Cu 2 O is the nucleus, and the composition of the catalyst is: Cu 50-90wt%, vacancy copper 5-30wt%, Cu 2 O 5~20wt%, the preparation method of described carbon dioxide electrochemical reduction electrode comprises:

[0032] S1: Clean the copper mesh, nickel foam and copper foil base layer with water, ethanol or acetone, and then wash them in H 3 PO 4 and leveling at a constant potential voltage of 3V to 5V for 5s to 1200s, then washed and dried for later use;

[0033] S2: Immerse the base layer in a mixture of a certain amount of sodium hydroxide and an oxidizing agent, the oxidizing agent is one or two of ammonium persulfate, potassium persulfate, sodium persulfate, hydrogen peroxide, and potassium dichromate, And the concentratio...

Embodiment 1

[0039] With the copper grid as the base, ultrasonically wash in ultrapure water and ethanol for 10 min, and then wash in 95% H 3 PO 4 In the process, leveling was carried out for 900s under the condition of a constant potential voltage of 4V, washed and dried for later use; the base layer was immersed in a mixture of 2M aqueous sodium hydroxide solution and 0.05M ammonium persulfate, and the ratio of sodium hydroxide to oxidant was 15: 1. Continue to react for 30 minutes and dry at 100°C to obtain CuO x Nanowire / Cu base layer; with the molar concentration ratio of disodium edetate dihydrate and Cu in copper salt as 1:1, 0.4M CuCl 2 2H 2 O mixed with disodium edetate dihydrate and treated with H 2 SO 4 Adjust the pH of the copper salt solution to 1.0 as the electrolyte, using a deposition current density of -150mAcm -2 , deposited for 60s, and then with a deposition current density of -60mAcm -2 , deposited for 1200s, as attached figure 1 As shown, after cleaning, place ...

Embodiment 2

[0041] With the copper mesh as the base, ultrasonically wash in ultrapure water and ethanol for 10 min, and then wash in 95% H 3 PO 4 In the process, the voltage of the constant potential is 4V, and the leveling is carried out for 900s, washed and dried for later use; the base layer is immersed in a mixture of 1.5M sodium hydroxide aqueous solution and 0.05M potassium persulfate, and the ratio of sodium hydroxide and oxidizing agent is 10 : 1, continue the reaction for 40min, and dry at 100°C to obtain CuO x Nanowire / Cu base layer; the molar concentration ratio of disodium ethylenediaminetetraacetic acid dihydrate and Cu in copper salt was 1:1, and 0.2M Cu(NO 3 ) 2 ·3H 2 O mixed with disodium edetate dihydrate and treated with H 2 SO 4 Adjust the pH of the copper salt solution to 1.0 as the electrolyte, using a deposition current density of -120mAcm -2 , deposited for 80s, and then with a deposition current density of -60mAcm -2 , deposited for 1500s, as attached figu...

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Abstract

The invention relates to an electrode for electrochemical reduction of carbon dioxide and application thereof. A catalyst is an ordered core-shell catalyst. The preparation method of the electrode comprises the following steps: pretreatment of a substrate: immersing a substrate layer into a certain amount of a mixture of sodium hydroxide and oxide, and preparing a CuOx nanowire / Cu substrate by a chemical oxidation method; adding a reducing agent and an additive into copper salt, mixing according to a certain proportion, performing Cu deposition by utilizing variable current density, carrying out washing, drying and baking, and then putting the obtained electrode into a CO2 saturated electrolyte for reduction at a constant potential, and carrying out washing and drying; and soaking the prepared gas diffusion electrode in a concentrated hydrochloric acid solution with the concentration of 36%-38% to obtain the electrode. The vacancy copper has more active areas and defect sites and the coupling synergistic effect among the components is utilized, so that the selectivity and activity of the hydrocarbon are improved. By utilizing the interaction between Cu<+> and each metal, CO2 electroreduction is limited in a functional structural domain, so that the loss of the catalyst in the CO2 reduction process is avoided, and the stability of the catalyst is improved.

Description

technical field [0001] The invention belongs to the technical field of carbon dioxide electrochemical reduction, and in particular relates to an electrode for carbon dioxide electrochemical reduction and application thereof. Background technique [0002] With the increasing energy consumption and environmental pollution, CO 2 The amount of emissions is increasing year by year, and the resulting rise in temperature and sea level has become the focus of global attention. CO 2 The fixation and conversion of carbon dioxide is one of the main ways to reduce carbon dioxide emissions. The main technologies include catalytic hydrogenation, catalytic reforming, electrochemical or photoelectrochemical reduction, etc. CO 2 Electrochemical reduction (ERC) is the use of electrical energy, especially renewable energy, to convert CO 2 The new technology of reducing to synthetic gas, formic acid, hydrocarbons, ethanol and other high value-added chemicals is a green way to couple energy ...

Claims

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Application Information

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IPC IPC(8): C25B1/00C25B3/04C25B11/06C25D3/38C25D5/18C25D9/04B01J35/02B01J35/00B01J23/72C25B3/25
CPCC25B1/00C25D3/38C25D5/18C25D9/04B01J23/72B01J35/33B01J35/50
Inventor 钟和香刁国华张晶潘立卫
Owner DALIAN UNIV
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