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Heterojunction nano-material electrocatalyst, and applications thereof in CO2 reduction

A technology of electrocatalysts and nanomaterials, applied in the direction of electrodes, electrolytic processes, electrolytic components, etc., can solve the problems of low directional conversion rate and generally poor activity of reduced electrocatalysts, and achieve easy operation, good economic and environmental benefits, good reproducibility

Active Publication Date: 2019-05-03
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention can effectively solve CO 2 Reduction electrocatalysts generally have poor activity and low directional conversion to alcohols. In high-selectivity CO 2 Huge potential and broad prospects in green transformation

Method used

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  • Heterojunction nano-material electrocatalyst, and applications thereof in CO2 reduction
  • Heterojunction nano-material electrocatalyst, and applications thereof in CO2 reduction
  • Heterojunction nano-material electrocatalyst, and applications thereof in CO2 reduction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1 prepares Au-Ag / Ag 2 S heterojunction nanocatalyst

[0036] (1) Add 90mg polyvinylpyrrolidone (K30), 620mg cetyltrimethylammonium chloride 450μL, chloroauric acid with a concentration of 48.56mM, 1000μL silver nitrate with a concentration of 102mM and 8.6mL of water, stirred for 4min to make it evenly mixed to obtain a mixed solution;

[0037] (2) The mixed solution obtained in step (1) is placed in the hydrothermal kettle, after the hydrothermal kettle and the lining are sealed, the gas is charged and the initial pressure is set to 0.8Mpa, and the reaction temperature of the hydrothermal kettle is controlled at 200℃, the hydrothermal reaction time is controlled at 20h, and Ag-Au-Ag heterojunction nanorods with good dispersion are obtained;

[0038] (3) Cool to room temperature after the reaction in step (2), take out the Ag-Au-Ag heterojunction nanorods, and disperse them in 6 mL of water after centrifuging and washing for 3 times to obtain the Ag-Au-Ag h...

Embodiment 2

[0040] Example 2 Au-Ag / Ag 2 S heterojunction nanoelectrocatalysis for CO 2 Restoration method

[0041] (1) in 0.5M KHCO 3 Continuously pass CO in the solution at a rate of 10-60mL / min 2 Gas, Au-Ag / Ag assembled on 1cm*1cm FTO conductive glass surface 2 The S heterojunction nanocatalyst is used as the working electrode, and the linear sweep voltammetry test is performed at a scan rate of 50mV / s in the range of -0.3V to -1.0V;

[0042] (2) Experiments show that Au-Ag / Ag 2 S has superior electrocatalytic CO 2 Reduction activity, the current density at -0.95V reaches -310mA / mg;

[0043] (3) The amounts of ethanol and methanol in the carbon-containing products collected after electrolysis with a voltage of -0.95V for 1 hour are 300 μmol / (h*mg) and 520 μmol / (h*mg), respectively, and the Faradaic efficiency of ethanol is about 70 %

Embodiment 3

[0044] Example 3 Au-Ag / Ag 2 S heterojunction nanoelectrocatalysis for CO 2 Restoration method

[0045] (1) in 0.5M NaHCO 3 Continuously pass CO in the solution at a rate of 10-60mL / min 2 Gas, Au-Ag / Ag assembled on 1cm*1cm FTO conductive glass surface 2 The S heterojunction nanocatalyst is used as the working electrode, and the linear sweep voltammetry test is performed at a scan rate of 50mV / s in the range of -0.3V to -1.0V;

[0046] (2) The amounts of ethanol and methanol in the carbon-containing products collected after electrolysis with a voltage of -0.75V for 1 hour are 180 μmol / (h*mg) and 670 μmol / (h*mg), respectively, and the Faradaic efficiency of ethanol is about 50 %.

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Abstract

The invention belongs to the technical field of CO2 reduction and immobilization, and discloses a method used for reducing CO2 into carbon-containing compounds taking a heterojunction nano-material Au-Ag / Ag2S as a catalyst through applying a reaction matrix liquid with voltage. The method is capable of inhibiting hydrogen evolution reaction effectively, and increasing the oriented conversion efficiency of CO2 into alcohol products; ethanol Faradic efficiency is as high as 70%, and the application prospect in the field of CO2 green conversion is promising.

Description

technical field [0001] The invention belongs to CO 2 Reduction field, specifically related to a heterojunction nanomaterial Au-Ag / Ag 2 S catalyzes CO 2 A new method for reduction to carbonaceous compounds. Background technique [0002] Atmospheric greenhouse gas CO caused by the massive burning of fossil fuels since the Industrial Revolution 2 The continuous increase of concentration is an environmental problem that human beings urgently need to solve in the 21st century. The use of electrocatalytic technology to convert CO 2 Reduction into organic liquid energy with high added value (such as HCOOH, CH 3 OH and C 2 h 5 OH, etc.), on the one hand, it solves the problem of carbon source loss, on the other hand, it alleviates the climate change caused by the greenhouse effect, and it is the realization of CO 2 One of the ideal ways of green transformation. [0003] Electrocatalytic reduction of CO 2 There are many types of gaseous and liquid products (such as CO, CH ...

Claims

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Application Information

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IPC IPC(8): C25B3/04C25B11/06C25B3/25
Inventor 方萍萍黄家俊刘晓庆童叶翔
Owner SUN YAT SEN UNIV
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