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A carbon dioxide conversion electrolytic cell and its preparation method and application

A carbon dioxide, electrolytic cell technology, applied in electrolytic components, electrolytic process, electrolytic organic production, etc., can solve the problems of poor electrochemical performance, limited operating temperature of carbon dioxide conversion electrolytic cells, etc., to improve the conductivity and expand the electrolysis temperature range. , improve the effect of conversion kinetics

Active Publication Date: 2022-04-01
SHENZHEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a carbon dioxide conversion electrolytic cell and its preparation method and application, aiming at solving the problems of limited operating temperature and poor electrochemical performance of the existing carbon dioxide conversion electrolytic cell

Method used

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  • A carbon dioxide conversion electrolytic cell and its preparation method and application
  • A carbon dioxide conversion electrolytic cell and its preparation method and application
  • A carbon dioxide conversion electrolytic cell and its preparation method and application

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Embodiment 1

[0077] Follow the steps below to prepare an electrolytic cell for high-efficiency conversion of carbon dioxide at medium and low temperatures:

[0078] 1. Preparation of doped cerium oxide / carbonate electrolyte: weigh Ce(NO 3 ) 3 ·6H 2 O and Sm(NO 3 ) 3 ·6H 2 O in a 1000mL beaker, add an appropriate amount of deionized water and stir to dissolve to form a light yellow nitrate solution. 1mol / L NH 4 HCO 3 Pour the solution into the nitrate solution, and a large amount of white precipitates can be observed. Adjust the pH to 7-8, stir for 2 hours to fully precipitate the cations, and let stand overnight. Suction filtration was performed with a Buchner funnel, washed three times with deionized water and twice with absolute ethanol, and the filter residue was taken out and placed in a blast drying oven at 120°C for drying. The dried SDC precursor powder was placed in a high-temperature muffle furnace and calcined at 500-700° C. for 2 hours to obtain light yellow SDC powder. ...

Embodiment 2

[0084] To evaluate electrolytic cells at low CO 2 Electrolyzed CO at concentration 2 The electrolytic performance performance, to the electrolytic cell that embodiment 1 makes under 1.6V, 600 ℃ condition, pass into 80%, 60%, 40% and 20% CO respectively at the cathode 2 / N 2 , to test different CO 2 Concentration of current density. At the same time, different CO 2 Electrochemical Impedance Spectroscopy of SOEC at Concentrations.

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Abstract

The invention discloses a carbon dioxide conversion electrolytic cell and its preparation method and application, wherein, it includes a solid electrolyte, an anode and a cathode respectively located on both sides of the solid electrolyte; the solid electrolyte is a composite doped cerium oxide / carbonate Electrolyte; The chemical molecular formula of described doped cerium oxide is RM X Ce Y o 2‑δ , where the RM X Ce Y o 2‑δ In X+Y=1, 0≤X≤0.25, RM is one or more in Sm, Gd, Ca, Mg, K, Na; The chemical molecular formula of described carbonate is (Li x Na y K z ) 2 CO 3 , where x+y+z=1. The electrolytic cell is prepared by co-pressing and co-sintering. Using the solid electrolyte of the present invention can improve the conductivity of the electrolytic charge carrier and promote the CO 2 Chemisorption and conversion of CO 2 The conversion kinetics enables the carbon dioxide conversion electrolysis cell based on the solid electrolyte to operate at a medium-low temperature of 400-650°C, and has the characteristics of high efficiency, low cost, and stable system.

Description

technical field [0001] The invention relates to a solid oxide electrolytic cell, in particular to a carbon dioxide conversion electrolytic cell and its preparation method and application. Background technique [0002] To solve the problem caused by CO 2 The continued increase in the concentration will have a severe impact on the global environment and climate, CO 2 Emission reduction has become a major strategic demand in the world. will CO 2 Transforming into energy products or chemical raw materials that can be used in industry is undoubtedly an ideal way to save energy and reduce emissions. In addition, the renewable energy industry represented by solar energy and biomass energy has developed rapidly, but its gap characteristics affect its power quality, making it difficult to directly connect to the grid. Electrochemical conversion to CO 2 The conversion and resource utilization of the renewable energy provides a new way, which can store the renewable energy in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B3/26C25B9/17C25B11/091
CPCC25B3/26C25B9/17C25B11/091
Inventor 范梁栋俞莉翔景义甫
Owner SHENZHEN UNIV
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