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Preparation of porous copper electrode for electrochemical reduction of carbon dioxide and electrode and application thereof

A carbon dioxide and electrochemical technology, applied in the direction of electrodes, electrode shape/type, electrolysis process, etc., can solve the problems of reducing the catalytic effect of catalysts, changing product distribution, poor stability, etc., and achieves adjustable size, uniform structure, and low cost. low effect

Inactive Publication Date: 2017-06-20
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

However, the catalysts used in the construction of GDE are usually spherical metal nanoparticles, and many non-noble metal nanoparticles are not stable in the air, and the surface is easily oxidized (such as red nano-Cu is oxidized to black CuO), which seriously reduces the performance of the catalyst. Catalytic effect, while also changing the product distribution
In order to maintain the high catalytic activity of metal nanoparticles, it is usually necessary to activate the prepared GDE, which is cumbersome and difficult to control.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1. Pretreatment of thin copper sheet: the thickness is 0.05mm, the area is 3.0cm 2, The copper sheet with a Cu content of 99.9% is polished with 1200 sandpaper, washed with water, degreased with acetone, and cleaned with deionized water, then transferred to concentrated hydrochloric acid for 10 minutes to chemically remove the scale, and finally cleaned with ultrapure water, inert gas After drying, place it in a desiccator for later use;

[0042] 2. Electrodeposited zinc coating on thin copper sheets: use deionized water to prepare ZnSO4·7H 2 O content is 300g L -1 plating solution, add 2M H 2 SO 4 Adjust the pH of the plating solution to 2.0±0.2, with 0.5gL -1 Hexadecyltrimethylammonium bromide and polyethylene glycol are additives, the copper base processed through step 1 is a cathode, the Zn rod is an anode, and the Pt sheet is an auxiliary electrode. A 2273 potentiostat (produced by U.S. Princeton Company ) Electrodeposition of zinc coating under constant curre...

Embodiment 2

[0049] 1. Copper foil pretreatment: the thickness is 0.02mm, the area is 3.0cm 2 , Copper foil with a Cu content of 99.99%, after degreasing with ethanol, cleaning with deionized water, transfer to concentrated hydrochloric acid for 10 minutes to chemically remove scale, finally clean with ultrapure water, dry with inert gas, and place in a desiccator in standby;

[0050] 2. Electrodeposition of metal manganese on the surface of copper foil:

[0051] Preparation of MnSO using deionized water 4 ·H 2 O content is 110g L -1 , (NH 4 ) 2 SO4 content is 120gL -1 plating solution, use 2M H 2 SO 4 and ammonia water to adjust the pH of the plating solution to 5.0±0.2, and filter with filter paper to remove impurities in the electrolyte. With the copper foil treated in step 1 as the cathode, the Mn rod as the anode, and the Pt sheet as the auxiliary electrode, a 2273 potentiostat (produced by Princeton, USA) was used to electrodeposit the manganese coating under constant curren...

Embodiment 3

[0058] 1. Copper sheet pretreatment: the thickness is 0.1mm, the area is 3.0cm 2 , The copper sheet with a Cu content of 99.9% is polished with 1200 sandpaper, washed with water, degreased with acetone, and cleaned with deionized water, then transferred to concentrated hydrochloric acid for 10 minutes to chemically remove the scale, and finally cleaned with ultrapure water, inert gas After drying, place it in a desiccator for later use;

[0059] 2. Electrodeposited tin coating on copper sheet: use deionized water to prepare SnSO 4 The content is 30g L -1 、H 2 SO 4 The content is 110g L -1 The plating solution, to 0.5gL -1 Triton X-100 was used as an additive, the copper sheet treated in step 1 was used as a working electrode, the Pt sheet was used as an auxiliary electrode, and a saturated calomel electrode was used as a reference electrode. A 2273 potentiostat (produced by Princeton, USA) was used to electrodeposit the tin coating under constant current conditions at ro...

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Abstract

The invention provides a preparation method of a porous copper electrode for electrochemical reduction of carbon dioxide. The preparation method comprises the following steps: 1) a layer of a sacrificial metal is electrolytic deposited on a copper base material; 2) a heat treatment is conducted under the protection of an inert gas, so that a solid state diffusion between a metal copper and sacrificial metal atoms occurs, and an alloy layer of the sacrificial metal and the copper is obtained on the surface of the copper; 3) the electrochemical dealloying is conducted. The porosity of the porous copper electrode is 50%-95%, the pore size is 50 nm-500 nm, and the sacrificial metal content is no more than 5%. The porous copper electrode has the characteristics of adjustable pore size and quantity, good air permeability and high specific surface area. The porous copper electrode has better specificity for the selection of target products and is suitable for electrochemical reduction reaction of carbon dioxide catalyzing.

Description

technical field [0001] The invention belongs to the technical field of carbon dioxide electrochemical reduction, and in particular relates to the preparation of a porous copper electrode, the electrode and its application. Background technique [0002] Electrochemical reduction of CO 2 (ERC) technology is the use of electricity to convert CO 2 Reduction to various organic chemicals to achieve CO 2 A technology for resource utilization. with other COs 2 Compared with the conversion technology, the outstanding advantage of the ERC technology is that water can be used as the hydrogen source for the reaction, and CO can be realized at 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, one of the main factors restricting the development of ERC technology inc...

Claims

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Application Information

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IPC IPC(8): C25B11/03C25B11/04C25B3/04C25B3/25
CPCC25B11/04C25B3/25C25B11/031
Inventor 邱艳玲张华民钟和香李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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