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Method for preparing gas diffusion electrode of hydrocarbon through electrochemical reduction of carbon dioxide

A gas diffusion electrode and hydrocarbon 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 achieve low cost of raw materials, high Selectivity, anti-agglomeration effect

Active 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 prepared in advance, 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 catalytic performance of the catalyst. 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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  • Method for preparing gas diffusion electrode of hydrocarbon through electrochemical reduction of carbon dioxide
  • Method for preparing gas diffusion electrode of hydrocarbon through electrochemical reduction of carbon dioxide
  • Method for preparing gas diffusion electrode of hydrocarbon through electrochemical reduction of carbon dioxide

Examples

Experimental program
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Effect test

Embodiment 1

[0039] 1. Gas diffusion substrate heat treatment: Air is introduced into the tube furnace, the air flow rate is 100mlmin-1, and the area is 25cm 2 , TGP-H-060 carbon paper with a thickness of 0.2mm and a porosity of 78% was heat-treated at 500°C for 3 hours, then naturally cooled to room temperature, and the static water contact angle was measured to be 90°.

[0040] 2. Preparation of supported nano-Cu / C:

[0041] 1) Add 60ml deionized water and 170mg CuCl to a 250ml three-neck flask 2 2H 2 O, dissolved at room temperature;

[0042] 2) Dissolve 260mg of PVP with an average molecular weight of 45,000-58,000 in 40ml of deionized water, and transfer all of it to 1), and at the same time pass high Ar for gas replacement for 30min;

[0043] 3) 54mg KBH 4 Dissolve in 3ml deionized water, slowly add the aqueous solution dropwise to 2), control the dropping rate not higher than 0.5ml / min, the reaction system immediately appears wine red;

[0044] 4) According to the Cu:C mass ratio...

Embodiment 2

[0054] 1. Gas diffusion substrate heat treatment: Air is introduced into the tube furnace, the air flow rate is 100mlmin-1, and the area is 25cm 2 , TGP-H-030 carbon paper with a thickness of 0.1mm and a porosity of 82% was heat-treated at 300°C for 6 hours, and then naturally cooled to room temperature, and the static water contact angle was measured to be 130°.

[0055] 2. Preparation of supported nano-Cu / C:

[0056] 1) Add 39ml deionized water and 473mg Cu(NO3) to a 250ml three-necked flask 2 ·3H 2 O, dissolved at room temperature;

[0057] 2) Weigh 574 mg of trisodium citrate dihydrate, dissolve it in 5 ml of deionized water, and transfer all of it to 1), and at the same time pass high Ar for gas replacement for 30 min;

[0058] 3) 1.478g NaBH 4 Dissolve in 52ml of deionized water, slowly add the aqueous solution to 2) dropwise, control the dropping rate not higher than 1ml / min, the reaction system immediately appears wine red;

[0059] 4) According to the Cu:C mass r...

Embodiment 3

[0067] 1. Gas diffusion substrate heat treatment: Air is introduced into the tube furnace, the air flow rate is 100mlmin-1, and the area is 25cm 2 , a commercial carbon cloth with a thickness of 0.2mm and a porosity of 80% 2002HD was heat-treated at 600°C for 2 hours, then cooled down to room temperature naturally, and the static water contact angle was measured to be 60°.

[0068] 2. Preparation of supported nano-Cu / C:

[0069] 1) Add 7.8ml deionized water and 67mg CuCl to a 100ml three-neck flask 2 2H 2 O, dissolved at room temperature;

[0070] 2) Weigh 73 mg of disodium edetate dihydrate, dissolve it in 10 ml of deionized water, and transfer all of it to 1), and at the same time pass high Ar for gas replacement for 30 min;

[0071] 3) 106mg KBH 4 Dissolve in 6ml of deionized water, slowly add the aqueous solution dropwise to 2), control the dropping rate not higher than 0.2ml / min, the reaction system will slowly appear wine red;

[0072] 4) According to the Cu:C mas...

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Abstract

The invention provides a method for preparing a gas diffusion electrode of hydrocarbon through electrochemical reduction of carbon dioxide. The method comprises the following steps: (1), taking porous carbon material as a substrate, and carrying out thermal treatment in the air to remove the coating on the surface of carbon fiber and increase the hydrophilia of the carbon fiber to aqueous solution so as to obtain a gas diffusion substrate; (2) preparing supported nano Cu / C; (3) taking the porous carbon material subjected to thermal treatment as the substrate, and depositing particles containing Cu / C on the surface and the cross section of the carbon material under negative pressure; (4) soaking the gas diffusion electrode sample in HCl acid solution for at least 24 h, and cleaning the gas diffusion electrode sample up; and (5) spraying alcoholic solution of perfluorosulfonic acid resin on the gas diffusion electrode, and drying at the room temperature to obtain the gas diffusion electrode of hydrocarbon through electrochemical reduction of carbon dioxide. The method has the following advantages: the raw material cost is low, the preparation process is simple, the dispersion distribution characteristic of Cu particle can be kept to the maximum to prevent agglomeration of nano Cu particles, and high catalytic activity to hydrocarbon during the electrochemical reduction process of CO2 is ensured.

Description

technical field [0001] The invention belongs to the technical field of carbon dioxide electrochemical reduction, in particular to a preparation method and application of a gas diffusion electrode. Background technique [0002] With the rapid development of the global economy, the emission of carbon dioxide is increasing day by day, and the "greenhouse effect" caused by CO2 in the atmosphere has become one of the key environmental protection issues that the world is concerned about. To reduce CO in the atmosphere 2 content, the researchers used a variety of technical means to convert CO 2 for recovery, conversion and reuse. [0003] with other COs 2 Conversion technology compared to electrochemical reduction of CO 2 The outstanding advantage of the technology (ERC) is that water can be used as the hydrogen source for the reaction, and it can effectively overcome CO 2 / CO 2 * - High reaction overpotential (-1.97V vs SHE), CO2 can be realized at normal temperature and pr...

Claims

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Application Information

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IPC IPC(8): C25B11/03C25B11/12C25B3/04B22F9/24B82Y40/00C25B3/25
CPCB82Y40/00B22F9/24C25B3/25C25B11/057C25B11/031C25B11/051C25B11/075C25B11/043
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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