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Preparation methods and applications of multistage hollow CoFe2O4 material and CoFe2O4/C composite

A composite material, cofe2o4 technology, which is applied to the preparation and application fields of multi-level hollow CoFe2O4 materials and CoFe2O4/C composite materials, can solve the problem of not containing secondary nanostructures and the like, and achieves the effects of simple process, simple process and low cost

Inactive Publication Date: 2018-06-22
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Related reports The methods for synthesizing cobalt ferrite mainly include hydrothermal method, calcination method and MOF conversion method, but the synthesized materials often do not contain secondary nanostructures.

Method used

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  • Preparation methods and applications of multistage hollow CoFe2O4 material and CoFe2O4/C composite
  • Preparation methods and applications of multistage hollow CoFe2O4 material and CoFe2O4/C composite
  • Preparation methods and applications of multistage hollow CoFe2O4 material and CoFe2O4/C composite

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Experimental program
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Embodiment 1

[0028] This embodiment prepares CoFe 2 o 4The process includes the following steps:

[0029] (1) Synthesis of precursor multilevel hollow Co-Fc-Hcps coordination polymer: Weigh 0.2000g (1.1mmol) 1,1'-ferrocenedicarboxylic acid and 0.2124g (1.1mmol) cobalt nitrate hexahydrate respectively Dissolve in 18mL DMF / H 2 O (the volume ratio of the two is 1:1), after stirring evenly, add the cobalt nitrate solution dropwise into the 1,1'-ferrocenedicarboxylic acid solution. The mixture was stirred evenly and then transferred to a 50mL reactor for 20h at 125°C, centrifuged and washed with DMF / H 2 O (volume ratio 1:1) was washed until clarified, and Co-Fc-Hcps coordination polymer was obtained after air-drying at 80°C for 15 hours;

[0030] (2) The obtained Co-Fc-Hcps coordination polymer was calcined in a tube furnace at 350°C for 3h (3°C / min) to prepare CoFe 2 o 4 Material.

Embodiment 2

[0032] This embodiment prepares CoFe 2 o 4 The process includes the following steps:

[0033] (1) Synthesis of precursor multilevel hollow Co-Fc-Hcps coordination polymer: Weigh 0.5086g (1.8mmol) 1,1'-ferrocenedicarboxylic acid and 0.4326g (1.8mmol) cobalt nitrate hexahydrate respectively Dissolve in 18mL DMF / H 2 O (the volume ratio of the two is 1:1), after stirring evenly, add the cobalt nitrate solution dropwise into the 1,1'-ferrocenedicarboxylic acid solution. The mixture was stirred evenly and then transferred to a 50mL reactor at 125°C for 20h, centrifuged and washed with DMF / H 2 O (volume ratio 1:1) was washed until clarified, and Co-Fc-Hcps coordination polymer was obtained after air-drying at 80°C for 15 hours;

[0034] (2) The obtained Co-Fc-Hcps coordination polymer was calcined in a tube furnace at 450°C for 3h (3°C / min) to prepare CoFe 2 o 4 Material.

Embodiment 3

[0036] This embodiment prepares CoFe 2 o 4 The process includes the following steps:

[0037] (1) Synthesis of precursor multilevel hollow Co-Fc-Hcps coordination polymer: Weigh 0.5086g (1.8mmol) 1,1'-ferrocenedicarboxylic acid and 0.4326g (1.8mmol) cobalt chloride hexahydrate Dissolve in 18mL DMF respectively, stir evenly and add the cobalt chloride solution dropwise into the 1,1'-ferrocenedicarboxylic acid solution. The mixed solution was stirred evenly and then transferred to a 50mL reactor for reaction at 125°C for 12h, centrifuged and washed with DMF until clarified, and dried at 80°C for 15h to obtain the Co-Fc-Hcps coordination polymer;

[0038] (2) The obtained Co-Fc-Hcps coordination polymer was calcined in a tube furnace at 550°C for 3h (3°C / min) to prepare hollow CoFe 2 o 4 Material.

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Abstract

The invention provides methods for preparing a multistage hollow CoFe2O4 material and a composite thereof by using a coordination polymer. The methods comprise the specific synthesis steps as follows:firstly, preparing a multistage hollow ferrocenyl coordination polymer (Co-Fc-Hcps) from a cobalt salt and ferrocenyldicarboxylateby using a solvothermal method; preparing the multistage hollow CoFe2O4 material from the prepared Co-Fc-Hcps coordination polymer at an air atmosphere by using a high-temperature calcination method; and stirring the multistage hollow CoFe2O4 material and dopamine hydrochloride, and carrying out high-temperature calcination at a nitrogen atmosphere to obtain a CoFe2O4@C multistage hollow composite. The methods are simple, convenient and environment-friendly in reaction step and low in equipment requirement. Compared with an existing report, the CoFe2O4@C hollow spherical composite with a two-stage rodlike nanostructure has a wide application prospect on the aspects such as an application as a novel energy storage electrode material and a magnetic application.

Description

technical field [0001] The invention relates to a multi-level hollow CoFe 2 o 4 The preparation method of the composite material and its application in lithium ion battery electrode materials. Background technique [0002] With the widespread popularization of electronic devices, people's requirements for battery energy storage are also getting higher and higher. Therefore, a large number of researchers have invested in the study of electrode materials to improve the storage performance of batteries, and metal oxides and metal hydroxides are considered as remarkable electrode materials due to their high theoretical capacitance. The research results show that cobalt ferrite and its composite materials have high specific capacity as lithium battery electrode materials. Hui et al. prepared CoFe nitrate and ferric nitrate by hydrothermal method by adding cobalt nitrate and iron nitrate to the graphene solution. 2 o 4 Composite material with graphene, its specific capacity is...

Claims

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Application Information

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IPC IPC(8): C01G49/00H01M4/36H01M4/525H01M4/62H01M10/0525
CPCC01G49/0018C01P2002/72C01P2004/03C01P2004/80C01P2006/40H01M4/362H01M4/525H01M4/625H01M10/0525Y02E60/10
Inventor 张建民王灿沛董玉涛李丹刘玉山
Owner ZHENGZHOU UNIV
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