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

An electrochemical and electrode technology, which is applied in the field of metal oxide electrodes and its preparation, can solve the problems of poor reproducibility, increase the complexity of the electrode preparation process, cumbersome preparation and storage procedures, etc., and achieve simple, controllable and stable preparation methods. Strong operability, thin and dense oxide layer on the surface

Active Publication Date: 2019-04-19
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above two methods of expanding the electrochemical reaction area usually involve tedious 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 electrodes.

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0038] 1. Zinc foil pretreatment: with a purity of 99.9%, a thickness of 100 microns, and an area of ​​10 cm 2 Zinc foil is used as the base material. First, it is soaked in dilute hydrochloric acid with a mass fraction of 2% at room temperature for 10 minutes to remove impurities such as surface scale, and then rinsed with a large amount of deionized water to neutrality. air dry;

[0039] 2. The zinc electrode with a dense oxide layer on the surface is prepared with Zn(NO 3 ) 2 ·6H 2 O and octadecyltrimethylammonium bromide are raw materials, prepare hydrothermal reaction precursor solution 60ml, wherein Zn(NO 3 ) 2 The concentration is 0.2mM, and the concentration of octadecyltrimethylammonium bromide is 0.5mM. After completely dissolving, it is transferred into a 100ml reactor liner (the material is PTFE, and the thickness is 5mm). After sealing, it is sent into 160 ℃ oven for hydrothermal reaction, take it out after 6h, and cool down to room temperature. Take out the...

Embodiment 2

[0044] 1. Pretreatment of pure indium foil: with a purity of 99.9%, a thickness of 100 microns, and an area of ​​5 cm 2 The indium foil is used as the base material, first at room temperature, soaked in phosphoric acid with a mass fraction of 50% as the working electrode, the Pt sheet as the counter electrode, and the saturated calomel electrode as the reference electrode. Using a potentiostat, control the electrolysis voltage to 0.16V for 30 minutes to remove impurities such as surface scale, then rinse with a large amount of deionized water until neutral, and blow dry with high-purity argon;

[0045] 2. The indium electrode with a dense oxide layer on the surface is prepared with InCl 3 And triton (Triton-100) is raw material, preparation hydrothermal reaction precursor solution 60ml, wherein InCl 3 The concentration of triton is 0.1mM, and the concentration of triton is 0.2mM. Stir until it is completely dissolved and transfer it to a 100ml reactor lining (the material is ...

Embodiment 3

[0050]1. Pretreatment of pure copper sheets: with a purity >99.9%, a thickness of 100 microns, and an area of ​​9 cm 2 The copper sheet was used as the base material, and it was soaked in 85% phosphoric acid at room temperature 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;

[0051] 2. Copper electrode with a dense oxide layer on the surface is prepared with CuSO 4 ·5H 2 O and tetradecyltrimethylammonium bromide are raw materials, prepare 60ml of hydrothermal reaction precursor solution, wherein CuSO 4 The concentration of tetradecyltrimethylammonium bromide is 3mM, the concentration of tetradecyltrimethylammonium bromide is 0.2mM, heated to 45°C, stirred u...

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Abstract

The invention provides preparation of an electrode for electrochemical reduction of CO2, and an electrode and application thereof. The technology of combining hydrothermal reaction and electrochemicalreduction has advantages of simple operation and strong reproducibility, and is characterized in that a surfactant is introduced during the hydrothermal reaction. Through the surfactant for orientedadsorption of the base metal surface, growth orientation of the metallic oxide can be regulated and controlled to obtain a dominant crystal face having high selectivity to HCOOH. The prepared surfaceoxide layer is thin and dense, and can effectively hinder the participation of the base metal in an ERC reaction so as to control the efficient conversion of the electrochemical reduction of CO2 to atarget product.

Description

technical field [0001] The invention belongs to the technical field of carbon dioxide electrochemical reduction, in particular to a metal oxide 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 reaction overpot...

Claims

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Application Information

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IPC IPC(8): C25B11/06C25B3/04C23C18/12C25B3/25
CPCC23C18/1216C25B3/25C25B11/077C25B11/051
Inventor 邱艳玲张华民张桃桃徐文斌李先锋苏盼盼
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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