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Method for preparing modified SnO2 electrode and application of method for preparing formic acid by photoelectric catalytic reduction of CO2

A photoelectric catalysis, CO2 technology, applied in electrodes, electrolysis process, electrolysis components, etc., can solve the problems of low utilization rate of visible light, high reaction overpotential, poor product selectivity, etc.

Active Publication Date: 2018-07-31
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the existing photocatalytic reduction of CO 2 The reaction has low utilization rate of visible light, low catalytic activity, poor product selectivity, high reaction overpotential and hydrogen evolution reaction competition in the reduction process. A modified SnO 2 Preparation method of electrode and its application in photoelectrocatalytic reduction of CO 2 Formic acid

Method used

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  • Method for preparing modified SnO2 electrode and application of method for preparing formic acid by photoelectric catalytic reduction of CO2
  • Method for preparing modified SnO2 electrode and application of method for preparing formic acid by photoelectric catalytic reduction of CO2
  • Method for preparing modified SnO2 electrode and application of method for preparing formic acid by photoelectric catalytic reduction of CO2

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Embodiment 1

[0027] 10.518 g SnCl 4 ·5H 2 O was dissolved in 60mL distilled water, stirred for 30min until the solution was uniform, and 4 ·5H 2 O molar ratio is 10:1:1 Weigh 0.4034 g CuCl respectively 2 , 0.2284 g thiourea was added to the above solution, magnetically stirred for 3h, and ultrasonically 0.5h. Then the mixed solution was transferred to a polytetrafluoroethylene-lined stainless steel autoclave, heated in water at 180°C for 5 hours, cooled to room temperature after the water heat was completed, soaked in 20 mL of ethanol and water for 1 hour, ultrasonicated for 30 minutes, and then centrifuged. Repeat 5 times until no Cl - Until it is detected, a white precipitate will be obtained, which is dried in a drying oven at 80°C and then ground. The obtained white powder was calcined in a muffle furnace at 500°C for 4h, cooled to room temperature and then ground to obtain modified Cu-S co-doped SnO 2 catalyst. The conductive glass (FTO) was cut to a size of 1 cm×2 cm, and pret...

Embodiment 2

[0029] 10.518 g SnCl 4 ·5H 2 O was dissolved in 60mL distilled water, stirred for 30min until the solution was uniform, and 4 ·5H 2 O molar ratio is 10:2:0.5 and weighs 0.8000 g AlCl respectively 3 and 0.1142 g of thiourea were added to the above solution, magnetically stirred for 5 h, and ultrasonicated for 1 h. Then transfer the mixed solution to a polytetrafluoroethylene-lined stainless steel autoclave, heat it in water at 160 °C for 7 h, cool to room temperature after the end of the water heat, soak in 50 mL of ethanol and water for 1 h, ultrasonic for 30 min, and then centrifuge. Repeat this step 3 times until there is no Cl - Until it is detected, a white precipitate will be obtained, which is dried in a drying oven at 100°C and then ground. The obtained white powder was calcined in a muffle furnace at 400°C for 4h, cooled to room temperature and then ground to obtain modified Al-S co-doped SnO 2 catalyst. The conductive glass (FTO) was cut into a size of 2 cm×2 c...

Embodiment 3

[0031] 10.518 g SnCl 4 ·5H 2 O was dissolved in 60mL distilled water, stirred for 30min until the solution was uniform, and 4 ·5H 2 O molar ratio is 20:1:1 and weighs 0.3050 g MgCl respectively 2 ·6H 2 O and 0.1142 g thiourea were added to the above solution, magnetically stirred for 5 h, and ultrasonicated for 1 h. Then the mixed solution was transferred to a polytetrafluoroethylene-lined stainless steel autoclave, heated in water at 160°C for 3 h, cooled to room temperature after the hydroheat was completed, soaked in 30 mL of ethanol and water for 1 h, and ultrasonicated for 30 min, and then Centrifuge, this step is repeated 5 times until there is no Cl - Until it is detected, a white precipitate will be obtained, which is dried in a drying oven at 100°C and then ground. The obtained white powder was calcined in a muffle furnace at 500°C for 3h, cooled to room temperature and then ground to obtain the modified Mg-S co-doped SnO 2 catalyst. The conductive glass (FTO)...

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Abstract

The invention discloses a method for preparing modified SnO2 electrode and application of method for preparing formic acid by photoelectric catalytic reduction of CO2, and belongs to the field of photoelectric catalysis. The problems of low visible light utilization, low catalytic activity, poor product selectivity, high reaction overpotential and competition of hydrogen evolution reaction in theprocess of reduction in the reaction of existing photoelectric catalytic reduction of CO2 are solved. A simple one-step hydrothermal method is used for preparing metal and non-metal co-doping modifiedSnO2 catalyst and preparing the metal and non-metal co-doping modified SnO2 catalyst into an electrode to be applied to preparing the formic acid by the photoelectric catalytic reduction of the CO2,the prepared metal-non-metal co-doping modified SnO2 electrode exhibits good catalytic activity and selectivity for reaction of preparing the formic acid by the reduction of the CO2, and the overpotential needed for the reduction can be effectively reduced. The overpotential of the Cu-S co-doping modified SnO2 in the process of preparing the formic acid by the reduction of the CO2 is reduced to 130 mV vs. RHE.

Description

technical field [0001] The invention belongs to the technical field of photoelectric catalysis, in particular to a modified SnO 2 Preparation method of electrode and its application in photoelectrocatalytic reduction of CO 2 Formic acid. Background technique [0002] With the continuous acceleration of the level of industrialization, more and more industrial waste gas is produced, which has caused serious environmental problems. CO 2 is the final oxidation product of carbonaceous materials, excess CO 2 emissions are the main cause of the greenhouse effect, and CO 2 Conversion into high value-added chemicals, such as formic acid or formate, methane, formaldehyde, carbon monoxide, methanol, etc., can effectively reduce CO in the atmosphere 2 Reducing human dependence on fossil fuels is an effective way to fundamentally solve the problem of environmental and energy shortages. [0003] CO 2 It is a very stable linear molecule with a carbon-oxygen bond length of 1.16 Å and...

Claims

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Application Information

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IPC IPC(8): C25B11/06C25B3/04C25B3/25
CPCC25B3/25C25B11/051C25B11/091
Inventor 杨慧敏胡雪艳韩玲军郭敏敏郜梦婷梁镇海
Owner TAIYUAN UNIV OF TECH
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