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A method for electrocatalytic reduction of carbon dioxide

A carbon dioxide, electrocatalysis technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of unreported synthesis gas, and minimize chemical consumption , reduce consumption, make up for expensive effects

Active Publication Date: 2019-06-21
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although there are many reported ZIFs structures for the adsorption and separation of different gases, the use of electrocatalytic reduction of CO 2 Generate H 2 / CO syngas aspect has not been previously reported

Method used

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  • A method for electrocatalytic reduction of carbon dioxide
  • A method for electrocatalytic reduction of carbon dioxide
  • A method for electrocatalytic reduction of carbon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A method for electrocatalytic reduction of carbon dioxide, comprising the steps of:

[0050] 1) Preparation of ZIF-8 material

[0051] Under the condition of magnetic stirring at room temperature, 0.558g of zinc sulfate hexahydrate was dissolved in 15ml of anhydrous methanol to form anhydrous clear solution A; 0.616g of organic ligand 2-methylimidazole was dissolved in 15ml of anhydrous methanol to form a clear solution B; Mix the clear solutions A and B, and continue to stir until it becomes turbid to form an emulsion; centrifuge the prepared emulsion at 3500rad / min and wash it 3 to 5 times to obtain a white paste; The paste was dried in a vacuum drying oven at 70°C for 8 hours to obtain a ZIF-8 material. The XRD pattern of the material is as follows figure 1 shown.

[0052] 2) Preparation of electrode-modified glassy carbon electrodes

[0053] Take 10 mg of the ZIF-8 material obtained in step 1), add 1 mg of carbon black, dissolve it in 1 mL of absolute ethanol, an...

Embodiment 2～3

[0057] The impact of using different zinc salts on the results of electrocatalytic carbon dioxide reduction when measuring and preparing ZIF-8 materials, that is, the method steps are the same as in Example 1, the difference is only to change the type of zinc salts in step 1), that is, using Zn(NO 3 ) 2 ·6H 2 O and Zn(AC) 2 ·H 2 O instead of ZnSO in step 1) 4 ·6H 2 O. The XRD pattern of ZIF-8 material is as follows figure 1 The results of the electrocatalytic reduction of carbon dioxide are shown in Table 1.

[0058] Table 1 Electrolysis result detection

[0059]

[0060] From Table 1, it can be seen that by adjusting the initial metal source, the CO efficiency and CO / H 2 The effective regulation of the ZIF-8 material prepared from zinc sulfate is used to modify the electrode for electrochemical reduction of CO 2 Tests show that the proportion of CO in the obtained product is higher, and the Faradaic efficiency of CO is higher.

Embodiment 4

[0062] A method for electrocatalytic reduction of carbon dioxide, comprising the steps of:

[0063] 1) Preparation of ZIF-8 material

[0064] Under the condition of magnetic stirring at room temperature, 0.558g of zinc sulfate hexahydrate was dissolved in 15ml of anhydrous methanol to form anhydrous clear solution A; 0.616g of organic ligand 2-methylimidazole was dissolved in 15ml of anhydrous methanol to form a clear solution B; Mix the clear solutions A and B, and continue to stir until it becomes turbid to form an emulsion; centrifuge the prepared emulsion at 3500rad / min and wash it 3 to 5 times to obtain a white paste; The paste was dried in a vacuum oven at 70° C. for 8 hours to obtain the ZIF-8 material.

[0065] 2) Preparation of modified ZIF-8 material

[0066] Get 400mg of the ZIF-8 material prepared in step 1) and put it into a tube furnace with an argon atmosphere, keep it warm at 300°C for 2h at a heating rate of 3°C / min, and obtain the modified material after co...

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Abstract

The invention discloses a method for electrocatalytic reduction of carbon dioxide. The method comprises the following steps: a three-electrode system is put in electrolyte containing carbon dioxide for electrolysis; the three-electrode system comprises a working electrode, a counter electrode and a reference electrode, wherein the counter electrode is a platinum chip electrode; the reference electrode is a saturated calomel electrode; the working electrode is a glassy carbon electrode after electrode modification; the electrode modification process is to modify the glassy carbon electrode by adopting a modifying agent through a chemical deposition method; and the modifying agent contains a ZIF-8 material or a modified ZIF-8 material. The ZIF-8 materials from different start zinc sources or the modified ZIF-8 materials calcined at different temperatures are applied to different electrolyte anions for electrocatalytic reduction of CO2; and the ZIF-8 materials or the modified ZIF-8 materials are used as electrocatalysts to achieve good selectivity, high efficiency and a certain stability.

Description

technical field [0001] The invention relates to the technical field of carbon dioxide reduction. More specifically, it relates to a method for the electrocatalytic reduction of carbon dioxide. Background technique [0002] CO 2 Usually used as a medium for renewable energy, it is the most stable carbon-oxygen compound at room temperature, and breaking the carbon-oxygen double bond requires a lot of energy, but it can be further combined with other technologies. Conversion and utilization of CO 2 There are several feasible ways, such as physical method, biochemistry, thermochemistry, photochemistry and electrochemistry, the obtained CO, methanol, etc. can be used to synthesize hydrocarbons, formic acid can be used in fuel cells, and other hydrocarbon chemicals raw material. [0003] In metal-organic framework materials (MOFs for short), the arrangement of organic ligands and metal ions or clusters has obvious directionality, which can form different framework pore structu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/04C25B1/00C25B11/06B01J35/00B01J23/06
CPCB01J23/06B01J35/0033C25B1/00C25B1/04C25B11/04Y02E60/36
Inventor 王玉琳王卓康鹏
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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