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C/N-NiCoFeMn LDH composite electrode material and preparation method thereof

A composite electrode, 2·6H2O technology, applied in the field of materials, can solve the problems of further improvement of specific capacitance, cycle stability and rate performance to be improved, etc., to improve electrochemical reaction activity, facilitate contact, and improve charge storage. effect of ability

Pending Publication Date: 2022-07-15
NORTHEAST DIANLI UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] From the above analysis, it can be seen that nickel-cobalt-based transition metal compounds usually have high electrochemical reactivity, but it is difficult to further improve their specific capacitance, and their cycle stability and rate performance also need to be improved.

Method used

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  • C/N-NiCoFeMn LDH composite electrode material and preparation method thereof
  • C/N-NiCoFeMn LDH composite electrode material and preparation method thereof
  • C/N-NiCoFeMn LDH composite electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1, this embodiment is a preparation method of C / N-NiCoFeMn LDH composite electrode material, including CoC 2 O 4·2H 2 Preparation of O precursor and preparation of C / N-NiCoFeMn LDH composite electrode material, the specific steps are as follows:

[0034] 1) CoC 2 O 4 ·2H 2 Preparation of O precursor

[0035] (1) Weigh 1 mmol of cobalt nitrate (Co(NO) 3 ) 2 ·6H 2 O) Dissolve in 30mL ultrapure water, stir for 0.5h under 50 ℃ water bath condition, obtain cobalt nitrate aqueous solution; Described ultrapure water (Ultrapure water) is familiar in the art, also known as UP water, refers to that the resistivity reaches 18MΩ·cm (25℃) water;

[0036] (2) Weigh 8mmol of oxalic acid (H 2 C 2 O 4 ·2H 2 O) Dissolve in 30 mL of ultrapure water, under the condition of magnetic stirring at 50 °C, to obtain an oxalic acid solution, add the oxalic acid solution dropwise to the cobalt nitrate aqueous solution at a rate of 0.2 drops / s, and then keep at 50 °C for 0.5...

Embodiment 2

[0049] Embodiment 2, this embodiment is a preparation method of C / N-NiCoFeMn LDH composite electrode material, including CoC 2 O 4 ·2H 2 Preparation of O precursor and preparation of C / N-NiCoFeMn LDH composite electrode material, the specific steps are as follows:

[0050] 1) CoC 2 O 4 ·2H 2 Preparation of O precursor

[0051] (1) 2 mmol of cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O) was dissolved in 50 mL of ultrapure water, and stirred for 0.5 h under a water bath condition of 50 °C to obtain an aqueous solution of cobalt nitrate;

[0052] (2) 12 mmol of oxalic acid (H 2 C 2 O 4 ·2H 2 O) Dissolved in 50 mL of ultrapure water, under the condition of magnetic stirring at 50 °C, to obtain an oxalic acid solution, the oxalic acid solution was added dropwise to the cobalt nitrate aqueous solution at a rate of 0.5 drops / s, and then kept at 80 °C for 1 h;

[0053] (3) the product obtained in (2) of step 1) is washed three times with ultrapure water;

[0054] (4) washing the ...

Embodiment 3

[0065] Embodiment 3, this embodiment is a preparation method of C / N-NiCoFeMn LDH composite electrode material, including CoC 2 O 4 ·2H 2 Preparation of O precursor and preparation of C / N-NiCoFeMn LDH composite electrode material, the specific steps are as follows:

[0066] 1) CoC 2 O 4 ·2H 2 Preparation of O precursor

[0067] (1) 3 mmol of cobalt nitrate (Co(NO 3 ) 2 ·6H 2 O) was dissolved in 60 mL of ultrapure water, and stirred for 0.5 h under the condition of a water bath at 50 °C to obtain an aqueous solution of cobalt nitrate;

[0068] (2) 12 mmol of oxalic acid (H 2 C 2 O 4 ·2H 2 O) Dissolved in 60 mL of ultrapure water, under the condition of magnetic stirring at 50 °C, to obtain an oxalic acid solution, the oxalic acid solution was added dropwise to the cobalt nitrate aqueous solution at a rate of 2 drops / s, and then kept at 100 °C for 2h;

[0069] (3) the product obtained in (2) of step 1) is washed three times with ultrapure water;

[0070] (4) washing...

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Abstract

The invention relates to a C / N-NiCoFeMn LDH composite material for a supercapacitor electrode material and a preparation method of the C / N-NiCoFeMn LDH composite material, and the preparation method is characterized by comprising the following steps: firstly, preparing CoC2O4. 2H2O with a rod-like structure under a low-temperature condition by taking cobalt nitrate and oxalic acid as reactants; secondly, slightly etching the cobalt oxalate serving as a precursor and a template by utilizing an alkaline environment of a dopamine hydrochloride polymerization system, doping a small amount of manganese acetate and ferric chloride in a polymerization process, and uniformly loading polydopamine and Fe and Mn elements on the surface of the cobalt oxalate, so as to obtain a precursor / template; and carrying out calcination and nickel nitrate etching treatment to prepare the C / N-NiCoFeMn LDH composite electrode material with a nanosheet assembled rod-shaped structure. The preparation method is scientific, reasonable, safe and easy to implement. The composite material obtained by the preparation method is novel in structure and has excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of materials, in particular to the preparation of electrode materials for supercapacitors, which is a C / N-NiCoFeMn LDH composite electrode material and a preparation method thereof. Background technique [0002] Due to the non-renewable characteristics of traditional fossil energy and the serious environmental pollution caused by its application process, the development and utilization of clean energy such as solar energy and wind energy, and the realization of green and low-carbon development of energy and resources are crucial to the sustainable development of human society. As a new type of electrochemical energy storage device, supercapacitors have broad application prospects in the field of new energy development and utilization due to their high power density, long cycle life, and fast charge and discharge rates. However, due to the limitation of its own energy storage mechanism, the low energy density...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/24H01G11/32H01G11/36H01G11/86
CPCH01G11/24H01G11/32H01G11/36H01G11/86
Inventor 杨柳范心宇关晓辉陈景阳吴海辉
Owner NORTHEAST DIANLI UNIVERSITY
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