Three-dimensional porous carbon supported bismuth sulfide/bismuth oxide composite catalyst as well as preparation method and application thereof

A composite catalyst, three-dimensional porous technology, used in electrodes, electrolysis processes, electrolysis components, etc., can solve the problems of poor conductivity, poor effect, and unfavorable environmental protection, and achieve improved conductivity, good conductivity, and large specific surface area. Effect

Active Publication Date: 2021-08-03
QUZHOU RES INST OF ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to overcome the poor conductivity of bismuth metal catalysts in the prior art, and the catalytic CO 2 The effect of reduction to prepare HCOOH is not good, and the existing carbon carriers used to improve the conductivity of bismuth metal are mostly non-renewable energy sources, which are not conducive to environmental protection and other issues. A three-dimensional porous carbon-supported bismuth sulfide / bismuth oxide composite catalyst is provided. The catalyst is prepared from biomass carrageenan and used in electrochemical CO 2 Reduced cathode material produces HCOOH product with high selectivity and catalytic activity

Method used

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  • Three-dimensional porous carbon supported bismuth sulfide/bismuth oxide composite catalyst as well as preparation method and application thereof
  • Three-dimensional porous carbon supported bismuth sulfide/bismuth oxide composite catalyst as well as preparation method and application thereof
  • Three-dimensional porous carbon supported bismuth sulfide/bismuth oxide composite catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Step (1): Weigh 500 mg of powdered carrageenan, put it into a tube furnace for calcination, use nitrogen as the protective gas, calcine at a temperature of 600°C, and heat up at a rate of 5°C·min -1 , holding time is 2h;

[0041] Measure 40mL of ultrapure water and 5mL of concentrated sulfuric acid with a mass fraction of 98%, pour the concentrated sulfuric acid into ultrapure water for dilution, and obtain a concentration of 2mol L -1 dilute sulfuric acid; put the calcined carrageenan into a mortar and grind until uniform, put it into the above dilute sulfuric acid solution for pickling treatment, stir magnetically for 24 hours, filter the mixed solution after pickling, and use ultrapure water Washing is carried out, and the precipitate after washing is put into a vacuum drying oven, and the temperature is maintained at 60° C., and S-doped porous carbon nanosheets are obtained after drying;

[0042] Step (2): Weigh 40 mg of the porous carbon nanosheets of step (1) and...

Embodiment 2

[0056] According to the preparation process of Example 1, the mass ratio of bismuth nitrate pentahydrate and porous carbon nanosheets is 1:2 in step (2), and the roasting temperature of carrageenan in step (1) is replaced by 500 ° C, 700 ° C, to obtain Composite catalyst Bi-CDC 500 1:2 and Bi-CDC 500 1:2.

[0057] According to the preparation process of Application Example 1, the composite catalyst prepared in Example 2 is used as cathode material, and the HCOOH Faradaic efficiency of the two catalysts at different voltages is as follows: Figure 7 shown. Bi-CDC 500 1:2 electrocatalytic CO 2 The highest Faradaic efficiency of reduction to HCOOH is about 90%, Bi-CDC 700 1:2 electrocatalytic CO 2 The highest faradaic efficiency of reduction to HCOOH is about 89%, which is lower than that of Bi-CDC 600 1:2 catalyst, indicating that the catalyst prepared by calcination temperature of 600℃ has the best performance.

Embodiment 3

[0059] According to the preparation process of Example 1, in step (2), the mass ratio of bismuth nitrate pentahydrate to porous carbon nanosheets is 1:2, and the hydrothermal reaction temperature in step (2) is replaced by 160°C and 200°C to obtain a composite Catalyst Bi-CDC 1:2 160 and Bi-CDC 1:2 200.

[0060] According to the preparation process of Application Example 1, the composite catalyst prepared in Example 2 is used as cathode material, and the HCOOH Faradaic efficiency of the two catalysts at different voltages is as follows: Figure 8 shown. Bi-CDC 1:2 160 electrocatalytic CO 2 The highest faradaic efficiency of reduction to HCOOH is about 85%, Bi-CDC 1:2 200 electrocatalytic CO 2 The highest Faradaic efficiency for reduction to HCOOH is about 45%. Compared with the Bi-CDC 600 1:2 catalyst, the performance has decreased, and the performance of the catalyst at 200 ° C has dropped significantly, indicating that the performance of the catalyst prepared by selecting...

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Abstract

The invention relates to the technical field of energy chemical industry and nanometer materials, and discloses a three-dimensional porous carbon supported bismuth sulfide / bismuth oxide composite catalyst and a preparation method and application thereof. In the catalyst, bismuth sulfide and bismuth oxide are loaded on porous carbon nanosheets in the form of nanorods, and the bismuth sulfide nanorods and the bismuth oxide nanorods are staggered; and the surface of the porous nanosheet is of a porous structure, the pore diameter is 50-100 microns, the length of the bismuth sulfide or bismuth oxide nanorod is 3-10 microns, and the diameter is 80-120 nm. The preparation method comprises the following steps: roasting carrageenan to obtain porous carbon nanosheets, mixing the porous carbon nanosheets with a bismuth nitrate solution, carrying out a hydrothermal reaction, washing the precipitate with water, and conducting drying to obtain the composite catalyst. The catalyst is prepared by using biomass carrageenan as a raw material, and the catalyst is used as a cathode material for electrochemical CO2 reduction to prepare an HCOOH product. The catalyst has high selectivity and catalytic activity.

Description

technical field [0001] The invention relates to the technical fields of energy, chemical industry and nanomaterials, in particular to a three-dimensional porous carbon-supported bismuth sulfide / bismuth oxide composite catalyst and its preparation method and application. Background technique [0002] In recent years, due to the massive combustion of fossil fuels, atmospheric CO 2 Concentrations of carbon dioxide continue to rise, causing a series of environmental problems such as global warming and sea level rise. Electrocatalytic reduction of CO 2 Technology can use green energy such as wind energy, solar energy and tidal energy to convert CO 2 Transforming into carbon-based chemicals and liquid fuels with high added value can not only reduce the greenhouse effect, but also alleviate the energy crisis. in various CO 2 Among the electrocatalytic reduction products, formic acid (HCOOH) has high energy density and economic benefits, and is convenient for transportation and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/07C25B3/26C25B11/097
Inventor 侯阳胡祥钊杨彬雷乐成
Owner QUZHOU RES INST OF ZHEJIANG UNIV
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