Preparation method of electrode for CO2 electrochemical reduction and electrode and application thereof

An electrochemical and electrode technology, applied in the field of high specific surface electrodes and their preparation, can solve the problems of increasing the complexity of the electrode preparation process, poor reproducibility, and not suitable for preparing larger-sized electrodes, etc., and achieves controllability and reliability. Strong operability, simple preparation method, and the effect of avoiding the collapse of the nanowire structure

Active Publication Date: 2018-06-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

The above two methods for expanding the electrochemical reaction area usually involve cumbersome nanoparticle preparation and storage procedures, or high-temperature heat treatment procedures, which increase the complexity of the electrode preparation process, and at the same time have poor reproducibility, and are not suitable for the preparation of larger-sized nanoparticles. the electrodes

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  • Preparation method of electrode for CO2 electrochemical reduction and electrode and application thereof
  • Preparation method of electrode for CO2 electrochemical reduction and electrode and application thereof

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Embodiment 1

[0025] 1. Substrate material pretreatment: with a thickness of 50 microns and an area of ​​10 cm 2 Copper foil is used as the base material. First, soak it in concentrated hydrochloric acid with a volume fraction of 36% to 38% at room temperature for 10 minutes to remove impurities such as surface scale, and then rinse it with a large amount of deionized water until it is neutral. Blow dry with high-purity argon;

[0026] 2. Preparation of Cu nanowire precursor: prepare a chemical treatment solution, wherein the concentration of ammonium persulfate is 0.1M, and the concentration of NaOH is 0.1M. After there are no bubbles in the solution, soak the copper foil substrate obtained in step 1 in the prepared chemical treatment solution, seal and dip in a constant temperature water bath at 30°C for 30 minutes, take it out, and then rinse it with a large amount of deionized water to medium. Blow dry with high-purity argon. The obtained nanowire precursor is black, and its appearanc...

Embodiment 2

[0030] 1. Preparation of Cu electrode supported by porous carbon paper: with a thickness of 0.19mm and an area of ​​3cm 2 The TGP-H-090 carbon paper is used as a porous conductive material, at 60 ° C, 0.5M CuSO 4 solution, at 60mAcm -2 1. Deposit a thin layer of Cu particles on the surface of the carbon paper under the condition of 30 minutes. After taking it out, rinse the surface with a large amount of deionized water, dry it with high-purity Ar and set it aside;

[0031]2. Cu electrode pretreatment: soak the Cu electrode obtained in step 1 and carried on the surface of porous carbon paper in concentrated hydrochloric acid with a volume fraction of 36% to 38% for 5 minutes to remove impurities such as surface scale, and then use a large amount of descaling Rinse with ionized water until neutral, then dry with high-purity argon;

[0032] 3. Preparation of Cu nanowire precursor: prepare a chemical treatment solution, wherein the concentration of sodium persulfate is 0.05M, a...

Embodiment 3

[0037] 1. Substrate material pretreatment: with a thickness of 100 microns and an area of ​​5 cm 2 The palladium sheet was used as the base material, firstly at room temperature, it was soaked in phosphoric acid with a mass fraction of 85% as the working electrode, the Pt sheet was used as the counter electrode, and the saturated calomel electrode was used as the reference electrode. Use a potentiostat, control the electrolysis voltage to 2V and treat for 5 minutes to remove impurities such as surface scale, then rinse with a large amount of deionized water until neutral, and dry with high-purity argon;

[0038] 2. Preparation of Pd nanowire precursor: prepare a chemical treatment solution, wherein the concentration of sodium persulfate is 0.3M, and use 2M NaOH to adjust the pH to 9. After no bubbles overflow in the solution, soak the copper foil substrate obtained in step 1 in the prepared chemical treatment solution, seal and immerse it in a water bath at room temperature fo...

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Abstract

The invention relates to a preparation method of an electrode for CO2 electrochemical reduction and the electrode and application thereof. The preparation method comprises the steps that firstly, impurity removal treatment is conducted to a substrate material; secondly, the substrate material is soaked in oxidizing chemical treatment liquid to obtain an electrode precursor with the surface being of a nanometer wire structure; and thirdly, the electrode precursor is subjected to electrochemical reduction treatment to obtain the electrode with a nanometer wire structure layer being attached to the surface of the electrode. According to the preparation method of the electrode for CO2 electrochemical reduction and the electrode and application thereof, compared with an existing bulk phase metal electrode preparation technology, the electrode can provide more active sites for an electrochemical reduction reaction of CO2, and the yield of a target product is improved; and the surface roughness of the nanometer wire structure layer attached to the surface of the electrode is high and changes the bonding energy between the intermediate product CO* and the electrode surface of key steps ofan ERC reaction, the subsequent reaction course of CO* is adjusted and changed, and selectivity of the target product is changed accordingly.

Description

technical field [0001] The invention belongs to the technical field of carbon dioxide electrochemical reduction, in particular to a high specific surface electrode and its preparation technology. Background technique [0002] Electrochemical reduction of CO 2 (ERC) technology is the use of electricity to convert CO 2 Reduction to the target product to achieve CO 2 A technology for transformation and efficient use. with other COs 2 Compared with conversion technology, the outstanding advantages of ERC technology are simple operation, low cost, water can be used as protonated hydrogen source, and CO2 can be realized under normal temperature and pressure. 2 High-efficiency conversion, so there is no need for energy consumption caused by hydrogen production, heating, and pressurization required by chemical conversion technology, and the investment in equipment is small. [0003] At present, the main factors for the slow development of ERC technology include: (1) high reacti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/08C25B11/06B82Y40/00
CPCB82Y40/00C25B11/075C25B11/081
Inventor 邱艳玲张华民钟和香李先锋张桃桃
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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