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Gas diffusion electrode for carbon dioxide electrochemical reduction reaction and preparation method for gas diffusion electrode

A gas diffusion electrode and carbon dioxide technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of low Faraday efficiency, hydrogen evolution side reaction suppression, etc., and achieve the goal of improving conversion rate, increasing concentration, and alleviating the problem of mass transfer polarization Effect

Active Publication Date: 2016-02-10
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The document JSolidState Electrochem (2007) 11:490-495 reported that using methanol as the solvent NaOH electrolyte as the catholyte, the electrolysis potential is -4.0V (relative to the Ag / AgCl electrode) and the highest Faraday efficiency of hydrocarbons reaches 80.6%, while the hydrogen evolution side reaction was significantly suppressed, H 2 The Faradaic efficiency is less than 4%

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  • Gas diffusion electrode for carbon dioxide electrochemical reduction reaction and preparation method for gas diffusion electrode

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Embodiment 1

[0029] 1. Gas diffusion layer degreasing pretreatment: at room temperature, the area is 9cm 2 1. TGP-H-060 carbon paper (with a porosity of 78%) with a thickness of 0.2 mm is ultrasonically soaked in acetone for 20 minutes, then cleaned with absolute ethanol, ultrasonically soaked for 15 minutes, and finally dried with Ar gas;

[0030] 2. Catalytic layer slurry preparation:

[0031] 1) Using melamine as the N source, prepare 100 mg of nitrogen (N) hollow carbon nanospheres (N-HCS) with a particle size of 100 nm according to the method provided in the literature Chem.Commun., 2014, 50, 329-331. Among them, the mass content of N in hollow carbon nanospheres is 8.5%, CO 2 The capture capacity is 7mmolg -1 .

[0032] 2) Accurately weigh 108 mg of red copper powder with a particle size of 40 nm and 15.4 mg of nitrogen-containing (N) hollow carbon nanospheres with a particle size of 100 nm, and disperse the two in 2.5 g of propylene glycol, and disperse them uniformly by ultrason...

Embodiment 2

[0041] 1. Gas diffusion layer degreasing and impurity removal pretreatment

[0042] 1) Degreasing at room temperature, the area is 9cm 2 1. Foamed copper (90% porosity) with a thickness of 1.0 mm is ultrasonically soaked in acetone for 20 minutes, then cleaned with absolute ethanol, ultrasonically soaked for 15 minutes, and finally dried with Ar gas;

[0043] 2) Removal of impurities At room temperature, ultrasonically soak the degreased copper foam in concentrated hydrochloric acid for 15 minutes, then wash it with deionized water until the pH is neutral, wash it with absolute ethanol, soak it for 5 minutes, and finally dry it with Ar gas , stored in a desiccator for later use.

[0044] 2. Catalyst layer slurry preparation

[0045] 1) Using triphenylphosphine as the P source, prepare 100 mg of phosphorus (P) hollow carbon nanocages (P-HCC) with a particle size of 250 nm according to the method provided in the literature Chem.Commun., 2014, 50, 329-331. Among them, the mass...

Embodiment 3

[0054] 1. Gas diffusion layer degreasing and impurity removal pretreatment

[0055] 1) Degreasing

[0056] At room temperature, the area is 9cm 2 1. A copper fiber felt (85% porosity) with a thickness of 0.5 mm is ultrasonically soaked in acetone for 20 minutes, then cleaned with absolute ethanol, ultrasonically soaked for 15 minutes, and finally dried with Ar gas;

[0057] 2) Remove impurities

[0058] At room temperature, ultrasonically soak the degreased copper foam in concentrated hydrochloric acid for 15 minutes, then wash it with deionized water until the pH is neutral, wash it with absolute ethanol, soak it for 5 minutes, and finally blow it dry with Ar gas, and place it in a desiccator Save it for later use.

[0059] 2. Catalyst layer slurry preparation

[0060] 1) Using selenourea as a Se source, prepare 100 mg of phosphorus (P)-containing hollow carbon nanocapsules (P-HCC) with a particle size of 300 nm according to the method provided in the literature Chem.Comm...

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Abstract

The invention relates to a gas diffusion electrode for a carbon dioxide electrochemical reduction reaction. The gas diffusion electrode comprises a catalyst layer including a CO2 trapping agent, a catalyst and a binder, and a gas diffusion layer; the CO2 trapping agent is a material that can trap CO2 and can be coordinated with CO2. The gas diffusion electrode with the composition and structure can realize the functions of trapping and retaining the CO2, increase the CO2 gas concentration in a reaction interface, relieve the mass transfer polarization problem under a high overpotential reaction condition, provide a guarantee for the continuous efficient CO2 electroreduction reaction, and can relatively obviously improve the CO2 conversion efficiency.

Description

technical field [0001] The invention belongs to the technical field of carbon dioxide electrochemical reduction, in particular to a gas diffusion electrode and its preparation. 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 overpotential; (2) low conver...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/96
CPCY02E60/50
Inventor 邱艳玲张华民钟和香毛景霞
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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