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La monoatom-doped lithium cobaltate nano-catalyst, and preparation method and application thereof

A nano-catalyst, atomic technology, applied in the field of La single-atom doped LiCoO2 nano-catalyst, can solve the problems of poor Co atom activity and restricting catalytic activity, etc.

Active Publication Date: 2019-07-19
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, studies have shown that LiCoO 2 The active sites of LiCoO are mainly Co atoms at the edge of the cobalt oxide layer, and the Co atoms in the plane are less active, which restricts the LiCoO 2 Catalytic activity

Method used

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  • La monoatom-doped lithium cobaltate nano-catalyst, and preparation method and application thereof
  • La monoatom-doped lithium cobaltate nano-catalyst, and preparation method and application thereof
  • La monoatom-doped lithium cobaltate nano-catalyst, and preparation method and application thereof

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preparation example Construction

[0028] The present invention provides a La monoatom-doped LiCoO described in the above technical scheme 2 The preparation method of nano-catalyst includes the following steps:

[0029] Disperse lithium nitrate, cobalt nitrate hexahydrate, lanthanum nitrate hexahydrate, and citric acid monohydrate in deionized water and stir evenly to obtain a mixed solution;

[0030] Stir the mixed solution and heat it until the solvent is completely volatilized and the solute is condensed to obtain a gel;

[0031] Sintering the gel to obtain LiCoO doped with La monoatom 2 Nano catalyst.

[0032] The method provided by the present invention can obtain a catalyst with high doping amount and independent La atoms. The experiment requires less special equipment and the product is easy to separate.

[0033] In the present invention, lithium nitrate, cobalt nitrate hexahydrate, lanthanum nitrate hexahydrate, and citric acid monohydrate are dispersed in deionized water and stirred uniformly to obtain a mixed ...

Embodiment 1

[0044] La monoatomic doped LiCoO 2 Preparation of nano-catalyst:

[0045] Dissolve lithium nitrate, cobalt nitrate hexahydrate, lanthanum nitrate hexahydrate and citric acid monohydrate in deionized water under stirring at room temperature. The mass of lithium nitrate is 0.72g, the mass of cobalt nitrate hexahydrate is 2.92g, and the mass of lanthanum nitrate hexahydrate is 2.92g. The mass of citric acid monohydrate is 0.04g, the mass of citric acid monohydrate is 4.23g, and the volume of deionized water is 100mL. After stirring, it is heated and evaporated to dryness. The heating temperature is 150°C. The gel formed after evaporation is sintered. The sintering temperature is 710℃, the sintering time is 4.5h, and then it is naturally cooled to room temperature to obtain La monoatom-doped LiCoO 2 Nano catalyst.

[0046] figure 1 It is the La monoatom-doped LiCoO obtained in Example 1 of the present invention 2 High-angle circular dark-field image of the nanocatalyst in a scanning tr...

Embodiment 2

[0055] Dissolve lithium nitrate, cobalt nitrate hexahydrate, lanthanum nitrate hexahydrate and citric acid monohydrate in deionized water under stirring at room temperature. The mass of lithium nitrate is 0.69g, the mass of cobalt nitrate hexahydrate is 2.91g, and the mass of lanthanum nitrate hexahydrate is 2.91g. The mass of citric acid monohydrate is 0.04g, the mass of citric acid monohydrate is 4.22g, and the volume of deionized water is 100mL. After stirring, it is heated and evaporated to dryness. The heating temperature is 148°C. The gel formed after evaporation is sintered. The sintering temperature is 710℃, the sintering time is 5.5h, and then it is naturally cooled to room temperature to obtain La monoatom-doped LiCoO 2 Nano catalyst.

[0056] After testing, the La monoatom-doped LiCoO obtained in this example 2 The atomic mass fraction of La in the nanocatalyst is 1.0%.

[0057] The performance of the catalyst prepared in Example 2 is not significantly different from tha...

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Abstract

The invention provides a La monoatom-doped LiCoO2 nano-catalyst as well as a preparation method and application thereof. The chemical formula of the nano-catalyst is (0.9-1.95)% La-LiCoO2. According to the invention, La monoatoms are independently dispersed and doped in Co atom sites of LiCoO2 to construct the La monoatom-doped LiCoO2 nano catalyst. A heterogeneous structure is realized, so that the catalyst is easy to separate and collect from a reaction system and recycle; a La single atom with a larger size is doped at a Co atom site for replacing Co, thus the CoO6 octahedral structure of the LiCoO2 is distorted, the conductivity of the LiCoO2 is improved, the orbital hybridization effect of the Co-O atoms is enhanced, the adsorption energy of the Co atoms in the surface to oxygen is optimized, the Co atoms in the surface are effectively activated, and the LiCoO2 has high catalytic activity in an electrochemical oxygen production reaction. The catalyst is good in stability and can be recycled.

Description

Technical field [0001] The invention belongs to the technical field of energy catalysis, and in particular relates to a La monoatom doped LiCoO 2 Nano catalyst, its preparation method and its application. Background technique [0002] In recent years, as the energy crisis and environmental pollution have intensified, the technology of using electrolyzed water to produce hydrogen energy has received extensive attention. Water splitting consists of two half reactions, hydrogen production and oxygen production. The oxygen production reaction is slow in kinetics due to complex reaction paths and large number of transferred electrons, which restricts the energy conversion efficiency of electrolyzed water. How to reduce the overpotential required for the oxygen production reaction and carry out an efficient reaction is the focus of research in this field. [0003] Traditional noble metal catalysts have good catalytic activity, but have low reserves and are expensive. LiCoO 2 The repres...

Claims

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Application Information

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IPC IPC(8): B01J23/83C25B1/04C25B11/06
CPCB01J23/002B01J23/83B01J2523/00C25B1/04C25B11/04B01J2523/11B01J2523/3706B01J2523/845Y02E60/36
Inventor 张志荣冯晨刘春晓周仕明曾杰
Owner UNIV OF SCI & TECH OF CHINA
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