CO2 electroreduction reaction control method based on electrode solution system

A control method, CO2 technology, applied in the direction of electrode shape/type, electrode, electrolysis process, etc., can solve the problem of gradual change of product selectivity

Active Publication Date: 2020-07-07
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current preparation of Cu-based catalysts mostly adopts ex-situ physical, chemical, and electrochemical methods. 2 During the RR

Method used

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  • CO2 electroreduction reaction control method based on electrode solution system
  • CO2 electroreduction reaction control method based on electrode solution system
  • CO2 electroreduction reaction control method based on electrode solution system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: CO 2 RR reaction system and reaction control method

[0030] CO 2 RR can be carried out in an H-type temperature-controllable electrolytic cell, and its structure is composed of an anode chamber, a cathode chamber and an electrolyte membrane, such as figure 1 shown. The catholyte, working electrode (Cu-based electrocatalytic material) and reference electrode (saturated calomel electrode, SCE) are built in the cathode chamber; the electrolyte membrane can be a proton exchange membrane (such as: Membrane); the anode compartment is placed with an auxiliary electrode (or counter electrode) and an anolyte composed of an inert oxygen-evolving material. figure 2 The schematic diagrams of the operating methods of periodic potential and current step are given respectively. Among them, T a with T c The sum is a redox cycle.

Embodiment 2

[0031] Example 2: The surface morphology of the electrode solution interface constructed of Cu foil and different electrolyte solutions under the environment of periodic potential steps.

[0032] Cu foil and PBS solution, 0.5mol L -1 KHCO 3 solution and CO 2 Saturated 0.5mol·L -1 KHCO 3 The interface system formed by the solution, at 10℃, under the periodic potential step (E a =0.5V, T a =5s,E c =-2.2V, T c =70s) surface morphology after 30 minutes, the results are as follows image 3 shown.

[0033] It can be seen that in the PBS solution, irregular nano-copper particles are sparsely distributed on the surface of the copper foil, and the particle size is 30±10nm~80±10nm; 3 In the aqueous solution, the surface of the copper is distributed with more nano-copper with a shape similar to a pyramid, and its particle size ranges from 90±10nm to 240±10nm; in CO 2 saturated KHCO 3 In the aqueous solution, nano-copper in the shape of a quadrangular pyramid is densely distrib...

Embodiment 3

[0034] Example 3: Cu foil with CO 2 Saturated 0.5mol·L -1 KHCO 3 The surface morphology of the electrode-solution interface system formed by the solution under different periodic potential step operating environments.

[0035] Figure 4 Cu foil and CO are given respectively 2 Saturated 0.5mol·L -1 KHCO 3 The surface morphology of the electrode-solution interface system formed by the solution after 30 minutes of periodic potential step operation mode. The pretreatment process of Cu foil is: in phosphoric acid with a volume concentration of 85% at a current density of 50mA cm -2 Perform electropolishing treatment and rinse with deionized water; take it out and place it in absolute ethanol for ultrasonic treatment and rinse with deionized water.

[0036] Figure 4 (a) shows the CO 2 RR control mode is 10℃, periodic potential step (E a =1.0V, T a =5s,E c =-2.2V, T c =30s) Cu foil surface after 30 minutes. It can be seen that cubic copper particles with a particle siz...

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Abstract

The invention relates to a CO2 electroreduction reaction control method based on an electrode solution system. The CO2 electroreduction reaction control method can realize selective modulation of a product CH4. The electrode solution system is an interface system in which a copper-based electro-catalytic material (including copper foil, a copper net, nano-copper and carbon-loaded nano-copper particles) is in contact with an electrolyte solution. According to the interface system, the periodic step change of the potential is controlled within the temperature range of 0-60 DEG C, the selective preparation of the crystal face of the catalyst and the controllable preparation of the grain size can be realized, and the selective modulation of the CO2 electroreduction product is further realized.The modulation range of the methane Faraday efficiency is 5.5%-79%. The control method of the CO2 electroreduction reaction not only can modulate the selectivity of the product CH4, but also can improve the stability of the CO2 electroreduction reaction, and is suitable for large-scale application of the CO2 electroreduction technology.

Description

technical field [0001] The present invention relates to CO in nature 2 resource conversion, specifically a CO based electrode solution system with controllable hydrocarbon product selectivity 2 Electroreduction reaction (CO 2 RR) control method. Background technique [0002] CO 2 Electroreduction reaction (CO 2 RR) can convert CO under normal pressure and near normal temperature 2 Direct conversion into fuels and useful chemicals is a key technology to realize the "carbon cycle" in nature and alleviate many environmental problems. This technology has received the most attention in recent years due to its advantages such as simple system structure, environmental friendliness, and mild reaction conditions. Under the action of an electric field, CO 2 Can be reduced to CO, CH 4 、C 2 h 4 Gas phase products such as formic acid, ethanol and other liquid phase products. Among them, gaseous hydrocarbon products have higher combustion heat and economic added value. [0003...

Claims

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Application Information

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IPC IPC(8): C25B3/04C25B11/06C25B11/03C25B3/25
CPCC25B11/04C25B3/25C25B11/031
Inventor 毛庆赵健李冰玉刘松徐可一曹自强郭唱黄延强
Owner DALIAN UNIV OF TECH
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