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Porous electrode complex for carbon dioxide electrochemical reduction as well as preparation and application thereof

A porous electrode, carbon dioxide technology, applied in the direction of electrode shape/type, electrolysis process, electrolysis components, etc., can solve the problems of reducing the catalytic effect of the catalyst, changing the product distribution, poor stability, etc., to suppress the side reaction of hydrogen evolution and increase the retention. time, the effect of reducing the cost of electrode raw materials

Active Publication Date: 2017-03-22
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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  • Porous electrode complex for carbon dioxide electrochemical reduction as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1. Gas diffusion substrate degreasing pretreatment: At room temperature, ultrasonically soak TGP-H-060 carbon paper with a length and width of 4cm and 5cm, a thickness of 0.2mm, and a porosity of 78% in acetone for 20 minutes, and then Wash with absolute ethanol, soak in ultrasonic for 15min, and finally blow dry with Ar gas, in 6M HNO 3 Soak in aqueous solution at 50°C for 3 hours, wash with deionized water, dry with Ar gas, and measure the static water contact angle as 100 degrees;

[0048] 2. Porous metal electrode pretreatment: at room temperature, porous Cu sheets with a length and width of 4 cm and 5 cm, a thickness of 0.1 mm, a purity of 99.5%, an average pore diameter of 0.5 mm, and a porosity of 1% were placed in acetone and 0.5MH 2 SO 4 Ultrasonic soaking in medium for 20 minutes, degreasing and deoxidizing film treatment, then cleaning with absolute ethanol, ultrasonic soaking for 15 minutes, and finally drying with Ar gas;

[0049] 3. Cut two pieces of po...

Embodiment 2

[0055] 1. Gas diffusion substrate degreasing pretreatment: At room temperature, carbon cloth with a length and width of 4cm and 5cm, a thickness of 2.0mm, and a porosity of 80% is ultrasonically soaked in acetone for 30 minutes, and then cleaned with absolute ethanol , Ultrasonic soaking for 15min, and finally drying with Ar gas; in 6M HNO 3 Soak in aqueous solution at 50°C for 1 hour, wash with deionized water, dry with Ar gas, and measure the static water contact angle to be 130 degrees;

[0056] 2. Porous metal electrode pretreatment: at room temperature, porous Ag foil with a length and width of 4 cm and 5 cm, a thickness of 50 μm, a purity of 99.0%, an average pore diameter of 50 μm, and a porosity of 0.5% was prepared in acetone and 0.5MH 2 SO 4 Ultrasonic immersion in medium for 30 minutes, surface degreasing and oxide film removal, then cleaning with absolute ethanol, ultrasonic immersion for 15 minutes, and finally drying with Ar gas;

[0057] 3. Cut two pieces of p...

Embodiment 3

[0063] 1. Gas diffusion substrate degreasing pretreatment: At room temperature, soak a circular carbon felt with a diameter of 2.0 cm, a thickness of 3.0 mm, and a porosity of 95% in acetone for 30 minutes, then clean it with absolute ethanol, and ultrasonically Soak for 15 minutes, and finally dry it with Ar gas, and measure the static water contact angle as 130 degrees;

[0064] 2. Porous metal electrode pretreatment: at room temperature, a circular porous Pd sheet with a diameter of 2.0cm, a thickness of 0.2mm, a purity of 99.5%, an average pore diameter of 1.0mm, and a porosity of 0.1% was ultrasonically soaked in acetone for 30min , carry out surface degreasing treatment, then clean with absolute ethanol, soak in ultrasonic for 15min, and finally blow dry with Ar gas;

[0065] 3. Cut two pieces of polyimide coated with acrylate pressure-sensitive adhesive on one side into a circular frame, the outer diameter of the frame is 3.0cm, and the diameter of the hollow part (refe...

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Abstract

The invention provides a porous electrode complex structure for carbon dioxide electrochemical reduction and a preparing method thereof. The porous electrode complex structure comprises a gas diffusion base layer and a porous metal electrode layer which are laminated with each other and further comprises two hollow annular edge frames with the same shape and size, wherein the circumferential edges of the two annular edge frames are glued through an adhesive, and the gas diffusion base layer and the porous metal electrode layer are located between the two annular edge frames in the mutually laminated manner, forming a porous electrode complex. The porous electrode complex not only can utilize a porous gas diffusion base to rapidly transmit gas towards an electrode catalysis station and discharge liquid, but also can utilize metal electrode longitudinal holes to increase the area of an electrode reaction interface, so that the carbon dioxide electrochemical reduction rate is increased. The porous electrode complex structure is particularly suitable for a carbon dioxide electrochemical reactor in which reacting gas vertically flows across the electrode reaction interface.

Description

technical field [0001] The invention belongs to the technical field of carbon dioxide electrochemical reduction, and in particular relates to a porous electrode complex 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 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, the main factors restricting the development of ERC technology include: (1) high reaction overp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/03C25B1/00
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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