Electrochemical reduction CO2 catalyst based on boron and nitrogen co-doped nano-diamond and preparation method and application of catalyst

A nano-diamond, CO2 technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of expensive precious metals, scarce catalytic materials, poor product selectivity, etc., and achieve a wide potential window. , the effect of low background current and high current efficiency

Active Publication Date: 2016-06-22
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, metals and their complexes electrochemically reduce CO 2 It has the following disadvantages: low current efficiency (the impact of hydrogen evolution in electrolyzed water), poor product selectivity, high overpotential and easy deactivation of materials, while pre...

Method used

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  • Electrochemical reduction CO2 catalyst based on boron and nitrogen co-doped nano-diamond and preparation method and application of catalyst
  • Electrochemical reduction CO2 catalyst based on boron and nitrogen co-doped nano-diamond and preparation method and application of catalyst
  • Electrochemical reduction CO2 catalyst based on boron and nitrogen co-doped nano-diamond and preparation method and application of catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Example 1, boron and nitrogen co-doped nano-diamond electrochemical reduction of CO 2 active

[0019] A H-type double-cell reactor is used, in which the volume of the single cell is 100mL, the middle of the double cell is separated by a proton exchange membrane, the reactor is sealed, and the cathode chamber and the anode chamber are continuously fed with CO before the reaction. 2 The gas was saturated for 1h, and the gas flow rate was 20 sccm. A three-electrode working system is adopted, boron-nitrogen co-doped nano-diamond is the working electrode, the Pt electrode is the counter electrode, and the Ag / AgCl electrode is the reference electrode. The distance between the working electrode and the Pt electrode is 1.5cm, and the reference electrode is as close as possible to the working electrode. , respectively, in saturated CO 2 and N 2 0.1mol / L NaHCO 3 The linear voltammetry curve is measured in the aqueous solution, the area of ​​the working electrode and the volum...

Embodiment 2

[0022] Example 2, boron and nitrogen co-doped nano-diamond electrochemical reduction of CO 2 stability

[0023] A H-type double-cell reactor is used, in which the single-cell volume is 100mL, and the middle of the double-cell is separated by a proton exchange membrane. The reactor is sealed, and the gas-phase product is collected by an air bag, and the liquid-phase product is detected by gas chromatography. Before the reaction, the cathode chamber and the anode chamber were continuously fed with CO 2 The gas was saturated for 1h, and CO was continuously exposed during the reaction 2 Gas, the gas flow rate is 15 sccm, the cathode chamber is magnetically stirred, and the rotation speed is constant. In the three-electrode working system, boron-nitrogen co-doped nano-diamond is used as the working electrode, the Pt electrode is used as the counter electrode, and the Ag / AgCl electrode is used as the reference electrode. The distance between the working electrode and the Pt electr...

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Abstract

The invention belongs to the field of electrochemistry, and relates to an electrochemical reduction CO2 catalyst based on boron and nitrogen co-doped nano-diamond. A doping agent in the nano-diamond has the nitrogen content of 0-10 at%, the boron content of 0-5 at% and the granularity of 10-500 nm. The nano-diamond is prepared by depositing for 10-20 hours through a hot wire chemical gas-phase depositing method at the tungsten filament temperature of 1900-2200 DEG C and the pressure of 200-2000 Pa, wherein the volume percentage of N2 is 2.5-25%, and the volume percentage of CH4 is 0.5-20%. The catalyst has the advantages of being high in electro-catalysis activity, C2 product selectivity and material stability and the like for electrochemical reduction CO2 reaction, is a nonmetallic electro-catalysis material excellent in performance and low in price, and can be applied to the field of CO2 resourceful utilization.

Description

technical field [0001] The invention belongs to CO 2 In the field of resource utilization, it involves an electrochemical reduction of CO based on boron-nitrogen co-doped nano-diamonds 2 catalyst. Background technique [0002] Electrochemical reduction is CO 2 An important direction of resource utilization technology, which can reduce CO 2 Conversion to CO, formic acid, formaldehyde, methanol, CH 4 , acetic acid, ethylene and other substances are slowing down CO 2 The resulting greenhouse effect produces chemicals with economic value at the same time, which has both environmental and economic benefits, and has received extensive attention in recent years. Electrochemical reduction of CO 2 Low energy utilization, poor product selectivity, and easy catalyst deactivation are the main factors that limit its application, and the key to solving this problem is to develop electrode materials with specific selectivity and high catalytic activity. [0003] The most widely stud...

Claims

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Application Information

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IPC IPC(8): B01J27/24C25B3/04C25B11/12C25B11/06C25B3/25
CPCB01J27/24C25B3/25C25B11/043
Inventor 全燮张宇晶刘艳明陈硕
Owner DALIAN UNIV OF TECH
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