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CaMnO3 type perovskite material as well as preparation method and application thereof

A technology of perovskite materials and powder materials, applied in the field of electrocatalytic materials, can solve the problems of low redox catalytic activity and stability of perovskite materials, and achieve high redox catalytic activity, high catalytic activity and high stability. , the effect of large specific surface area

Pending Publication Date: 2020-11-27
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved in the present invention is to overcome existing CaMnO 3 The defects and deficiencies of redox catalytic activity and stability of type perovskite materials are not high, and a CaMnO 3 The preparation method of type perovskite material, the prepared CaMnO 3 Type perovskite materials have high redox catalytic activity and good stability

Method used

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  • CaMnO3 type perovskite material as well as preparation method and application thereof
  • CaMnO3 type perovskite material as well as preparation method and application thereof
  • CaMnO3 type perovskite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A kind of CaMnO 3 The preparation method of the type perovskite material includes the following steps:

[0048] S1. Dissolve calcium carbonate, manganese nitrate and citric acid in water to obtain a mixed solution, and add concentrated nitric acid dropwise to adjust the pH to 3; heat in an oil bath at 80°C for 12 hours to obtain a sol; freeze-dry the formed sol for 48 hours to form a powder Material; the molar ratio of the calcium salt, manganese salt and citric acid is 1:1:2;

[0049] S2. The powder material obtained in step S1 is calcined at 400°C for 5 hours, and then at 800°C for 6 hours;

[0050] S3. Heat at 500℃ for 1h in ammonia gas to produce CaMnO 3 Type perovskite material (denoted as CaMnO 3-x Or CMO-500).

Embodiment 2～10

[0052] CaMnO of Examples 2-10 3 The preparation method of the type perovskite material is the same as that of Example 1, except that the preparation conditions in Table 1 are changed as follows:

[0053] Table 1 Preparation conditions of each embodiment

[0054]

[0055]

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Abstract

The invention discloses a CaMnO3 type perovskite material as well as a preparation method and application thereof. The CaMnO3 type perovskite material with the proper oxygen vacancy is prepared by regulating and controlling the ratio and the pH value of calcium salt, manganese salt and a chelating agent to prepare a powder material, then calcining the powder material at low temperature, calciningthe powder material at high temperature and finally carrying out ammonia gas heat treatment. The preparation method is simple to operate, easy in raw material obtaining, low in cost and capable of realizing mass production. In addition, the CaMnO3 type perovskite material prepared by the method is uniform in particle, large in specific surface area and high in production repeatability, basically has no performance difference in different batches of samples, and is further high in oxidation-reduction activity and good in stability when being used as a catalyst material.

Description

Technical field [0001] The present invention relates to the technical field of electrocatalytic materials, and more specifically, to a CaMnO 3 -Type perovskite material and its preparation method and application. Background technique [0002] Oxidation-reduction reaction (ORR) is an important type of electrochemical reaction process, which is widely used in various energy storage and conversion devices. However, due to the slow reaction kinetics, the working efficiency of the device is severely limited. For this reason, a lot of research work is devoted to the development of high-performance redox electrocatalysts. At present, noble metal catalysts are recognized as the redox catalytic materials with the best performance. However, due to the insufficient earth reserves of noble metals, high prices and easy toxicity, noble metal catalysts are not suitable for large-scale commercial production and practical applications. [0003] Perovskite is a type of typical transition metal oxid...

Claims

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Application Information

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IPC IPC(8): C01G45/12H01M4/90H01M12/06B01J23/34B01J35/10B01J35/02
CPCC01G45/125H01M4/9016H01M12/06B01J23/34C01P2002/72C01P2004/03C01P2002/85C01P2004/32C01P2004/52C01P2006/12C01P2006/40B01J35/33B01J35/50B01J35/61
Inventor 卢锡洪杨帆曾银香周金浩
Owner SUN YAT SEN UNIV
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