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Preparation method and electrocatalytic application of perovskite electrode material

An electrode material, perovskite technology, applied in the direction of electrodes, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low optical purity of products, few active sites, small specific surface area of ​​flat electrode, etc., to achieve The effect of low cost, simple preparation method and good catalytic activity

Active Publication Date: 2020-07-10
EAST CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, a flat electrode is used as the cathode material in the asymmetric electrocarboxylation reaction of aromatic ketones, but the optical purity of the product is not high, and the specific surface area of ​​the flat electrode is small. Issues such as relatively few active sites

Method used

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  • Preparation method and electrocatalytic application of perovskite electrode material
  • Preparation method and electrocatalytic application of perovskite electrode material
  • Preparation method and electrocatalytic application of perovskite electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] a. Preparation of precursor

[0031] Weigh 1.0825 g (0.0025 mol) La(NO 3 ) 3 ·6H 2 O and 0.4496 g (0.0025 mol) Fe(NO 3 ) 3 9H2 O was dissolved in 50 mL of distilled water to form a transparent aqueous solution. After stirring for 10 min, 1.2608 g (0.006 mol) of citric acid monohydrate was added. After stirring for 30 min, the solvent was evaporated in a water bath at 85 °C to obtain a wet gel Dry at 180 °C for 12 h to obtain a fluffy powder as a precursor.

[0032] b. Preparation of perovskite electrode materials

[0033] Grind the precursor prepared above and put it into a crucible, cover it and place it in a muffle furnace, and bake it at 500°C for 5 hours to obtain the product LaFeO 3 Perovskite electrode materials (labeled as LaFeO 3 500).

[0034] See attached figure 1 , the above product was characterized by XRD (LaFeO 3 500 curve), the electrode material conforms to the characteristic diffraction peak of JCPDs card no.75-0541 perovskite, indicating that...

Embodiment 2

[0037] a. Preparation of precursor

[0038] With the a step of embodiment 1.

[0039] b. Preparation of perovskite electrode materials

[0040] Grind the precursor prepared above and put it into a crucible, cover it and place it in a muffle furnace, and bake it at 700 °C for 5 hours to obtain the product LaFeO 3 Perovskite electrode materials (labeled as LaFeO 3 700).

[0041] See attached figure 1 , the above product was characterized by XRD (LaFeO 3 700 curve), the electrode material conforms to the characteristic diffraction peak of JCPDs card no.75-0541 perovskite, indicating that a perovskite material with a better crystal form is formed.

[0042] See attached image 3 , the above product was characterized by scanning electron microscope, perovskite LaFeO 3 700 particles dispersed evenly.

Embodiment 3

[0044] a. Preparation of precursor

[0045] Weigh 1.0825 g (0.0025 mol) La(NO 3 ) 3 ·6H 2 O and 1.0000 g (0.0025 mol) Co(NO 3 ) 2 ·6H 2 O was dissolved in 50 mL of distilled water to form a transparent aqueous solution. After stirring for 10 min, 1.2608 g (0.006 mol) of citric acid monohydrate was added. After stirring for 30 min, the solvent was evaporated in a water bath at 85 °C. The obtained wet gel was Dry at 180°C for 12 h to obtain a fluffy powder as a precursor.

[0046] b. Preparation of perovskite electrode materials

[0047] Grind the precursor prepared above and put it into a crucible, cover it and place it in a muffle furnace, and bake it at 500 °C for 5 hours to obtain the product LaCoO 3 to the perovskite electrode material (labeled as LaCoO 3 500).

[0048] See attached figure 1 , the above product was characterized by XRD (LaCoO 3 500 curve), the electrode material does not have the characteristic diffraction peaks of perovskite, indicating that the...

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Abstract

The invention discloses a preparation method and electrocatalytic application of a perovskite electrode material. The method is characterized by comprising the following steps of: mixing La(NO3)3.6H2Oserving as a lanthanum source with an iron source Fe(NO3)3.9H2O, a cobalt source Co(NO3)2.6H2O or a nickel source Ni(NO3)2.6H2O, taking citric acid monohydrate as a complexing agent, and adopting a sol-gel method to obtain a perovskite electrode material, using the obtained perovskite electrode material as a cathode material for acetophenone asymmetric electrocarboxylation reaction to synthesize2-hydroxy-2-phenylpropionic acid with optical activity, and carrying out electrocarboxylation reaction under normal-pressure saturated carbon dioxide. Compared with the prior art, the electrode material is simple to prepare and low in cost, has good catalytic activity in electrocarboxylation reaction of acetophenone, is an electrocatalytic material with a good application prospect, can effectivelyutilize carbon dioxide gas with a greenhouse effect, and realizes conversion of acetophenone and effective synthesis of chiral substances.

Description

technical field [0001] The invention relates to the technical field of electrochemical reduction, in particular to a LaBO 3 Preparation method of (B=Fe / Co / Ni) perovskite electrode material and its electrocatalytic application in asymmetric electrocarboxylation of acetophenone. Background technique [0002] Carbon dioxide is a major member of the global greenhouse effect, and its activation and utilization can not only control greenhouse gas emissions and reduce environmental pollution, but also synthesize important chemical products using cheap and abundant Cl resources. Electrochemical fixation of carbon dioxide and aromatic ketones to asymmetrically synthesize important drug intermediate carboxylic acids is a valuable research direction using this method. J. X. Lu et al. K. Zhang, H. Wang, S. F. Zhao, D. F. Niu, J. X. LuJ. Electroanal. Chem. 2009, 630, 35–41 and B. L. Chen, Z.Y. Tu, H. Zhu, W.W. Sun, H.Wang , J.X. Lu, Electrochim. Acta, 2014, 116, 475-483 reported asymme...

Claims

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Application Information

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IPC IPC(8): B01J23/83C25B3/00C25B11/06
CPCB01J23/83C25B3/00C25B11/057B01J35/33
Inventor 王欢杨丽荣赵翊君侯悦蒋程洁陆嘉星
Owner EAST CHINA NORMAL UNIVERSITY
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