Reduction catalytic material, gas diffusion electrode and preparation method of gas diffusion electrode

A technology of gas diffusion electrodes and catalytic materials, applied in catalyst activation/preparation, chemical instruments and methods, electrodes, etc., can solve the problems of low activity and low production efficiency of formic acid, suppress hydrogen evolution reaction, improve faradaic current efficiency, increase The effect of large electrochemical reduction catalytic activity

Active Publication Date: 2018-10-12
SHENZHEN UNIV
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Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a reduction catalytic material, a gas diffusion electrode and a preparation method thereof, aiming at solving the problem of low formic acid production efficiency due to the low activity of the existing carbon dioxide electrochemical reduction catalyst

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  • Reduction catalytic material, gas diffusion electrode and preparation method of gas diffusion electrode

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Embodiment 1

[0046] Dissolve 0.1 g of dopamine hydrochloride monomer (DA for short) in 2 ml of ultrapure water, drop it into 100 ml of 10 mmol Tris-HCl solution at regular intervals, stir at room temperature for 5 h, and filter to obtain the polydopamine (PDA) catalyst precursor. Disperse the polydopamine catalyst precursor into 40ml of ultrapure water and add dropwise 1ml of Pt nanoparticle aqueous solution with a concentration of 0.4065g / L, stir at room temperature for 12h, filter and dry, and carbonize at 600°C for 1h under Ar atmosphere to obtain The catalytic material for the electrochemical reduction of carbon dioxide is called Pt@PDA-1-600 catalyst.

Embodiment 2

[0048] Dissolve 0.1 g of dopamine hydrochloride monomer (DA for short) in 2 ml of ultrapure water, drop it into 100 ml of 10 mmol Tris-HCl solution at regular intervals, stir at room temperature for 5 hours, and filter to obtain the PDA catalyst precursor. Disperse the catalyst precursor in 40ml of ultra-pure water and add dropwise 3ml of Pt nanoparticle aqueous solution with a concentration of 0.4065g / L, stir at room temperature for 12h, filter and dry, and carbonize at 600°C for 1h in an Ar atmosphere, which is the carbon dioxide electrochemical reduction catalyst , called Pt@PDA-3-600 catalyst. The Pt@PDA-3-600 catalyst in CO 2 The faradaic current efficiency measured at room temperature in a saturated 0.5M KCl solution is 37%.

Embodiment 3

[0050] Dissolve 0.1 g of dopamine hydrochloride monomer (DA for short) in 2 ml of ultrapure water, drop it into 100 ml of 10 mmol Tris-HCl solution at regular intervals, stir at room temperature for 5 hours, and filter to obtain the PDA catalyst precursor. Disperse the catalyst precursor in 40ml of ultra-pure water and add dropwise 5ml of Pt nanoparticle aqueous solution with a concentration of 0.4065g / L, stir at room temperature for 12h, filter and dry, and carbonize at 600°C for 1h in the atmosphere of Ar, which is the carbon dioxide electrochemical reduction catalyst , called Pt@PDA-5-600 catalyst. The Pt@PDA-5-600 catalyst in CO 2 The faradaic current efficiency measured at room temperature in a saturated 0.5M KCl solution is 45%.

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Abstract

The invention discloses a reduction catalytic material, a gas diffusion electrode and a preparation method of the gas diffusion electrode. The reduction catalytic material comprises carbonized polydopamine particles and Pt nanoparticles bonded to the surfaces of the carbonized polydopamine particles. According to the invention, high-temperature carbonization treatment is carried out on the polydopamine particles with the Pt nanoparticles bonded to the surfaces, and then the specific surface area of the reduction catalytic material can be effectively improved, so that more active sites of the Pt nanoparticles are exposed, the electrochemical reduction catalytic activity of the reduction catalytic material to the reduction of carbon dioxide is increased, and the hydrogen evolution reaction is effectively inhibited. The surface of the gas diffusion electrode provided by the invention is combined with the reduction catalytic material. When the carbon dioxide is reduced by the electrode, the electrode can conduct the current and also can quickly discharge by-products such as H2, CH4 and the like generated by the reduction process out of the working electrode, so that the contact area ofthe CO2 and the reduction catalytic material is ensured, and the Faraday current efficiency is improved.

Description

technical field [0001] The invention relates to the field of electroreduction catalysis, in particular to a reduction catalysis material, a gas diffusion electrode and a preparation method thereof. Background technique [0002] Since the beginning of the industrial revolution, human beings have gradually relied on fossil energy such as coal, oil, and natural gas. The carbon dioxide emitted into the atmosphere during the use of fossil energy has increased year by year, leading to the greenhouse effect, global warming, melting glaciers, and various natural disasters. , so it has attracted the attention of countries all over the world. To reduce CO in the atmosphere 2 People launched various initiatives, signed various agreements, and held various forums. Neither the limited emission reduction nor the development of renewable clean energy has achieved immediate results. [0003] In addition, formic acid is also an important basic chemical raw material, which is widely used i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J27/24B01J37/08C25B3/04C25B11/06C25B3/25
CPCB01J23/42B01J27/24B01J37/084C25B3/25C25B11/093B01J35/396B01J35/393B01J35/33
Inventor 何传新张瀚文杨恒攀林清柴晓燕范梁栋刘剑洪
Owner SHENZHEN UNIV
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