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Nanometer porous zinc electrode for electrochemical reduction of carbon dioxide, and preparation and application thereof

A nanoporous, carbon dioxide technology, applied in nanotechnology, electrodes, nanotechnology, etc. for materials and surface science, can solve problems such as limited development prospects, low current density, and small global reserves, and achieve a simple and easy-to-control preparation process , Improve catalytic activity, suitable for large-scale production

Active Publication Date: 2018-03-27
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pb, Hg, Cd, Tl and other metals have high Faradaic efficiency for electrocatalytic carbon dioxide reduction, but their current density is low, and they are heavy metals with high toxicity, which limits their practical application.
In and Bi are rare metals with small global reserves and relatively expensive prices, which limit their development prospects

Method used

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  • Nanometer porous zinc electrode for electrochemical reduction of carbon dioxide, and preparation and application thereof
  • Nanometer porous zinc electrode for electrochemical reduction of carbon dioxide, and preparation and application thereof
  • Nanometer porous zinc electrode for electrochemical reduction of carbon dioxide, and preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] After the 1mm Zn foil was cleaned with ethanol and ultrapure water, it was placed in 85% H 3 PO 4 solution, at 10mA cm -2 The current density was leveled for 300s, and then cleaned with ultrapure water and dried in argon as the substrate; under the protection of argon, 4g ZnO was added to 100ml, 6M KOH aqueous solution as the electroplating solution, at -10mA cm -2 Conduct metal deposition for 300s, then wash with ultrapure water, and dry under the protection of argon; after washing and drying, place in a tube furnace with air at 300°C for 8h; place the heat-treated electrode in CO 2 Saturated with 0.5M NaHCO 3 In the solution, reduce for 15 minutes under the condition of -1.5V to obtain the electrode.

[0038] The Zn electrodeposition layer thickness of the electrode is about 1.5 μm, the thickness of the Zn catalyst nanolayer is about 240nm, the Zn catalyst nanolayer contains pores with a diameter of 50nm-150nm, and the porosity of the Zn catalyst nanolayer is 5%; t...

Embodiment 2

[0043] After the Zn foil was treated with ethanol and ultrapure water, it was placed in 85% H 3 PO 4 solution, at 15mA cm -2 The current density was leveled for 100s, and then cleaned with ultrapure water and dried in argon as the substrate; 5g ZnO was added to 100ml, 10M KOH aqueous solution as the electroplating solution, at -20mA cm -2 Carry out metal deposition for 240s; after washing and drying, place in a tube furnace with air at 300°C for 10h; place the heat-treated electrode in CO 2 Saturated with 0.5M NaHCO 3 In the solution, reduce for 15 minutes under the condition of -1.4V to obtain the electrode.

[0044] The Zn electrodeposition layer thickness of the electrode is about 2 μm, the Zn catalyst nano layer thickness is about 300nm, the Zn catalyst nano layer contains pores with a diameter of 50nm-250nm, and the porosity of the Zn catalyst nano layer is 6%; the surface of the Zn catalyst nano layer is nanometer The particle size of the particles is 100nm-150nm. T...

Embodiment 3

[0046] After the Zn foil was treated with ethanol and ultrapure water, it was placed in 80% H 3 PO 4 solution, at 10mA cm -2 The current density was leveled for 240s, and then cleaned with ultrapure water and dried in argon as the substrate; 5g ZnO was added to 100ml, 7M KOH aqueous solution as the electroplating solution, at -10mA cm -2 Carry out metal deposition for 600s; after washing and drying, place in a tube furnace with air at 330°C for 8h; place the heat-treated electrode in CO 2 saturated with 0.5M KHCO 3 In the solution, reduce for 30 minutes under the condition of -1.5V to obtain the electrode.

[0047] The Zn electrodeposition layer thickness of the electrode is about 3 μm, the Zn catalyst nano layer thickness is about 200nm, the Zn catalyst nano layer contains pores with a diameter of 20nm-100nm, and the porosity of the Zn catalyst nano layer is 2%; the surface of the Zn catalyst nano layer is nanometer The particle size of the particles is 10nm-60nm. This e...

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Abstract

The invention discloses a nanometer porous zinc electrode for electrochemical reduction of carbon dioxide, and a preparation method and application thereof. The nanometer porous zinc electrode is composed of a substrate layer, a Zn electrodeposited layer on the outer surface of the substrate layer and a Zn catalyst nanolayer formed on the surface of the Zn electrodeposited layer, wherein the Zn catalyst nanolayer of the electrode is composed of Zn nanoparticles with particle sizes of 1 to 300 nm; the Zn catalyst nanolayer of the electrode contains pore channels with diameters of 1 to 300 nm and has porosity of 2 to 15%; the Zn electrodeposited layer has a thickness of 500 nm to 0.05 mm; and the Zn catalyst nanolayer has a thickness of 100 to 500 nm. According to the invention, the Zn nanoparticles with abundant marginal active sites are prepared through electrodeposition on a substrate, heat treatment and electrochemical reduction, so the electrode has substantially improved specific surface area and active area and is enhanced in Faraday efficiency in electrochemical reduction of carbon dioxide into formic acid.

Description

technical field [0001] The invention relates to the technical field of carbon dioxide electrochemical reduction, in particular to the technical field of electrodes for carbon dioxide electrochemical reduction. Background technique [0002] In recent years, with the development of the global economy and the increasing demand for energy around the world, CO in the atmosphere 2 The continuous increase of emissions, the global warming and ecological problems caused by it are severe challenges to the sustainable development of human beings. In order to effectively alleviate the "greenhouse effect" and reduce CO in the atmosphere 2 content, the CO 2 Recycling and conversion is one of the important ways. CO 2 It is the product of the highest oxidation stage of carbon. From the perspective of chemical change, it is in a very stable state, which is close to "inert gas". Therefore, to find an efficient way to transfer CO 2 has always been the focus of social attention. CO 2 As...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/06C25B3/04C25B11/03B82Y30/00B82Y40/00C25B3/25
CPCB82Y30/00B82Y40/00C25B3/25C25B11/031C25B11/057C25B11/075
Inventor 张华民张桃桃钟和香邱艳玲李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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