Electrode for carbon dioxide electroreduction and preparation method thereof

Abstract

The invention relates to an electrode for carbon dioxide electroreduction and a preparation method thereof.The electrode comprises a substrate layer, a transition layer and a catalysis layer, and the preparation method comprises the steps that a 100-500-micron copper net or copper sheet or copper plate or copper foil serves as a substrate, and after acetone and hydrochloric acid are used for cleaning, the substrate is placed in the transition layer; the electrode substrate layer is placed in an oxidation solution to be oxidized, and an electrode substrate layer with oxide or hydroxide on the surface is obtained; preparing an aminocellulose modified transition layer on the surface of the treated substrate layer; under the protection of inert atmosphere, performing in-situ gradient potential deposition on a catalyst layer, cleaning and drying the deposited catalyst layer with ethanol and water, and then placing the catalyst layer in a vacuum oven for drying at the temperature of 100-200 DEG C to prepare an electrode; the electrode has excellent carbon dioxide electroreduction activity, selectivity and stability.

Description

technical field

[0001] The invention belongs to the technical field of preparation and application of electrodes for electrochemical reduction of carbon dioxide, and in particular relates to an electrode for electrochemical reduction of carbon dioxide and a preparation method thereof. Background technique

[0002] Electrochemical reduction of carbon dioxide (ERC) is the use of electrical energy (especially renewable energy) to convert CO 2 Reduce to CO, formic acid, hydrocarbons and other high value-added chemicals, etc., effectively realize the greenhouse gas CO 2 A technology for resource utilization and renewable energy storage. ERC technology is also one of the important ways to achieve carbon peaking and carbon neutrality "dual carbon" goals. Therefore, ERC technology has potential economic and environmental benefits.

[0003] Catalyst is one of the key materials for electrochemical reduction of carbon dioxide (ERC), and its performance directly affects the conversio...

Examples

Embodiment 1

[0035] A 200 μm copper mesh was used as the base, cleaned with acetone and hydrochloric acid, and then placed in NH 3 ·H 2 O and (NH 4 ) 2 S 2 O 8 The oxidizing solution with a molar ratio of 8:1 was treated for 8 min. After cleaning, it is used as the base layer; the amino cellulose solution with a concentration of 0.2% is prepared, and diethylamino cellulose is sprayed by spraying method to the surface of the base layer, and the loading amount of the transition layer is 0.3 mg / cm 2 . The electrodes after spraying were placed in a vacuum oven to dry at 100 °C for 6 h. SnCl 2 Mixed with hydrochloric acid and water to prepare SnCl with a concentration of 0.2mol / L 2 The aqueous solution is mixed with 0.6 mol / L NaF and 0.10 mol / L ethylenediaminetetraacetic acid, and then 0.09 mol / L sodium citrate is added to obtain an electroplating solution, and the pH value is adjusted at 4 by using hydrochloric acid. The molar ratio of Sn to EDTA is 8:1 and the molar ratio of NaF to S...

Embodiment 2

[0053] A 200 μm copper mesh was used as the base, cleaned with acetone and hydrochloric acid, and then placed in NH 3 ·H 2 O and (NH 4 ) 2 S 2 O 8 The oxidizing solution with a molar ratio of 8:1 was treated for 8 min. After cleaning, it is used as the base layer; the amino cellulose solution with a concentration of 0.2% is prepared, and p-aminobenzyl cellulose is sprayed on the surface of the base layer, and the loading amount of the transition layer is 0.3 mg / cm 2 . The electrodes after spraying were placed in a vacuum oven to dry at 100 °C for 6 h. SnCl 2 Mixed with hydrochloric acid and water to prepare SnCl with a concentration of 0.2mol / L 2 The aqueous solution is mixed with 0.6 mol / L NaF and 0.10 mol / L iminodiacetic acid evenly, then 0.09 mol / L sodium citrate is added to obtain an electroplating solution, and the pH value is adjusted at 4 with hydrochloric acid. The molar ratio of Sn to iminodiacetic acid is 8:1 and the molar ratio of NaF to Sn is 15:1. Under ...

Embodiment 3

[0055] A 200 μm copper mesh was used as the base, cleaned with acetone and hydrochloric acid, and then placed in NH 3 ·H 2 O and (NH 4 ) 2 S 2 O 8 The oxidizing solution with a molar ratio of 8:1 was treated for 8 min. After cleaning, it is used as the base layer; the amino cellulose solution with a concentration of 0.2% is prepared, and diethylamino cellulose is sprayed by spraying method to the surface of the base layer, and the loading amount of the transition layer is 0.5 mg / cm 2 . The electrodes after spraying were placed in a vacuum oven to dry at 100 °C for 6 h. SnCl 2 Mixed with hydrochloric acid and water to prepare SnCl with a concentration of 0.2mol / L 2 The aqueous solution is mixed with 0.6 mol / L NaF and 0.10 mol / L iminodiacetic acid evenly, then 0.09 mol / L sodium citrate is added to obtain an electroplating solution, and the pH value is adjusted at 4 with hydrochloric acid. The molar ratio of Sn to EDTA was 8:1, and the molar ratio of NaF to Sn was 15:1. ...

technical field

[0001] The invention belongs to the technical field of preparation and application of electrodes for electrochemical reduction of carbon dioxide, and in particular relates to an electrode for electrochemical reduction of carbon dioxide and a preparation method thereof. Background technique

[0002] Electrochemical reduction of carbon dioxide (ERC) is the use of electrical energy (especially renewable energy) to convert CO 2 Reduce to CO, formic acid, hydrocarbons and other high value-added chemicals, etc., effectively realize the greenhouse gas CO 2 A technology for resource utilization and renewable energy storage. ERC technology is also one of the important ways to achieve carbon peaking and carbon neutrality "dual carbon" goals. Therefore, ERC technology has potential economic and environmental benefits.

[0003] Catalyst is one of the key materials for electrochemical reduction of carbon dioxide (ERC), and its performance directly affects the conversio...

Examples

Embodiment 1

[0035] A 200 μm copper mesh was used as the base, cleaned with acetone and hydrochloric acid, and then placed in NH 3 ·H 2 O and (NH 4 ) 2 S 2 O 8 The oxidizing solution with a molar ratio of 8:1 was treated for 8 min. After cleaning, it is used as the base layer; the amino cellulose solution with a concentration of 0.2% is prepared, and diethylamino cellulose is sprayed by spraying method to the surface of the base layer, and the loading amount of the transition layer is 0.3 mg / cm 2 . The electrodes after spraying were placed in a vacuum oven to dry at 100 °C for 6 h. SnCl 2 Mixed with hydrochloric acid and water to prepare SnCl with a concentration of 0.2mol / L 2 The aqueous solution is mixed with 0.6 mol / L NaF and 0.10 mol / L ethylenediaminetetraacetic acid, and then 0.09 mol / L sodium citrate is added to obtain an electroplating solution, and the pH value is adjusted at 4 by using hydrochloric acid. The molar ratio of Sn to EDTA is 8:1 and the molar ratio of NaF to S...

Embodiment 2

[0053] A 200 μm copper mesh was used as the base, cleaned with acetone and hydrochloric acid, and then placed in NH 3 ·H 2 O and (NH 4 ) 2 S 2 O 8 The oxidizing solution with a molar ratio of 8:1 was treated for 8 min. After cleaning, it is used as the base layer; the amino cellulose solution with a concentration of 0.2% is prepared, and p-aminobenzyl cellulose is sprayed on the surface of the base layer, and the loading amount of the transition layer is 0.3 mg / cm 2 . The electrodes after spraying were placed in a vacuum oven to dry at 100 °C for 6 h. SnCl 2 Mixed with hydrochloric acid and water to prepare SnCl with a concentration of 0.2mol / L 2 The aqueous solution is mixed with 0.6 mol / L NaF and 0.10 mol / L iminodiacetic acid evenly, then 0.09 mol / L sodium citrate is added to obtain an electroplating solution, and the pH value is adjusted at 4 with hydrochloric acid. The molar ratio of Sn to iminodiacetic acid is 8:1 and the molar ratio of NaF to Sn is 15:1. Under ...

Embodiment 3

[0055] A 200 μm copper mesh was used as the base, cleaned with acetone and hydrochloric acid, and then placed in NH 3 ·H 2 O and (NH 4 ) 2 S 2 O 8 The oxidizing solution with a molar ratio of 8:1 was treated for 8 min. After cleaning, it is used as the base layer; the amino cellulose solution with a concentration of 0.2% is prepared, and diethylamino cellulose is sprayed by spraying method to the surface of the base layer, and the loading amount of the transition layer is 0.5 mg / cm 2 . The electrodes after spraying were placed in a vacuum oven to dry at 100 °C for 6 h. SnCl 2 Mixed with hydrochloric acid and water to prepare SnCl with a concentration of 0.2mol / L 2 The aqueous solution is mixed with 0.6 mol / L NaF and 0.10 mol / L iminodiacetic acid evenly, then 0.09 mol / L sodium citrate is added to obtain an electroplating solution, and the pH value is adjusted at 4 with hydrochloric acid. The molar ratio of Sn to EDTA was 8:1, and the molar ratio of NaF to Sn was 15:1. ...

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