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NiCo2O4@NiCo2S4 core-shell nanowire array composite material and preparation method and application thereof

A nanowire array and composite material technology, applied in the field of nickel cobaltate@cobalt tetrasulfide core-shell nanowire array composite material and its preparation, can solve the problem of low energy density, poor cycle stability, super capacitor Popularization resistance and obstacles

Inactive Publication Date: 2017-10-20
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, traditional supercapacitors often have disadvantages such as low energy density, poor cycle stability, and low rate performance, which have caused resistance and obstacles to the popularization of supercapacitor technology.

Method used

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  • NiCo2O4@NiCo2S4 core-shell nanowire array composite material and preparation method and application thereof
  • NiCo2O4@NiCo2S4 core-shell nanowire array composite material and preparation method and application thereof
  • NiCo2O4@NiCo2S4 core-shell nanowire array composite material and preparation method and application thereof

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preparation example Construction

[0025] The invention provides a method for preparing nickel cobaltate@cobalt tetrasulfide alloyed nickel core-shell nanowire array composite material, comprising:

[0026] 1) nickel foam is carried out acidification;

[0027] 2) Place the acidified nickel foam in the closed reaction solution for hydrothermal reaction, then wash and dry to obtain the Ni-Co composite precursor, then wash, dry and calcinate the Ni-Co composite precursor get NiCo 2 O4 nanowire array material;

[0028] 3) NiCo 2 O4 nanowire array material, sulfide and water undergo sulfuration reaction, and then the reaction product is washed and dried to obtain NiCo 2 o 4 @NiCo 2 S 4 Core-shell nanowire array composites;

[0029] Wherein, the reaction liquid contains nickel salt, cobalt salt, ammonium salt, urea and water.

[0030] In step 1) of the above-mentioned preparation method, acid treatment can be carried out in various ways, but in order to make the oxide on the surface of nickel foam removed mor...

Embodiment 1

[0051] 1) Pretreatment of foamed nickel: Soak foamed nickel (2cm x 2cm, 1.3mm in thickness, 0.1488g in weight) in 2mol / L hydrochloric acid solution for 20min and ultrasonically clean it with deionized water at 25°C. Wash for 10 minutes;

[0052] 2) Add 1mmol Ni(NO 3 ) 2 ·6H 2 O, 2mmol Co(NO 3 ) 2 ·6H 2 O, 6mmol NH 4 F and 12mmol urea were dissolved in 35ml deionized water and stirred for 30min to form a mixed solution, then the nickel foam after the acidification treatment was immersed in the mixed solution, then the reaction system was transferred to a 50ml reactor and sealed for hydrothermal reaction (at 120°C React for 5h), take out the Ni-Co composite precursor after cooling, wash with deionized water and absolute ethanol three times respectively, dry at 60°C, and then calcinate at 320°C for 2h to obtain NiCo 2 o 4 nanowire array materials;

[0053] 3) Dissolve 0.8mmol sodium sulfide in 35ml deionized water, then add the above NiCo 2 o 4 The nanowire array mater...

Embodiment 2

[0055] Carry out NiCo according to the method for embodiment 1 2 o 4 @NiCo 2 S 4 Core-shell nanowire array composite material A2, the difference is: nickel foam meets the following conditions: the specification is 2cm × 3cm, the thickness is 1mm, and the weight is 0.148g; step 2) Ni(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O, NH 4 The contents of F and urea were 1mmol, 2mmol, 5mmol and 10mmol respectively; the content of sodium sulfide in step 3) was 0.8mmol, and the sulfidation reaction condition was 4h at 110°C.

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Abstract

The invention discloses a NiCo2O4@NiCo2S4 core-shell nanowire array composite material and a preparation method and application thereof. The preparation method comprises the steps of 1) subjecting a nickel foam to acidification; 2) placing the acidized nickel foam in a closed reaction solution for hydrothermal reaction, conducting washing and drying to obtain a Ni-Co composite precursor, and then washing, drying and calcining the Ni-Co composite precursor to obtain a NiCo2O4 nanowire array material; 3) subjecting the NiCo2O4 nanowire array material, sulfide and water to vulcanization reaction, washing and drying the reaction product to obtain a NiCo2O4@NiCo2S4 core-shell nanowire array composite material, wherein, the reaction solution contains nickel salt, cobalt salt, ammonium salt, urea and water. The NiCo2O4@NiCo2S4 core-shell nanowire array prepared by the method has excellent capacitance, specific capacitance and stability.

Description

technical field [0001] The present invention relates to a core-shell composite material, in particular to a nickel cobaltate@cobalt tetrasulfide alloy nickel core-shell nanowire array composite material and its preparation method and application. Background technique [0002] Due to energy consumption and environmental pollution, the development of new energy has become a major problem facing the world in recent years. In order to meet the ever-increasing energy demand, green energy storage devices with high power and excellent stability must be developed, and supercapacitors are one of the most ideal green energy storage materials. Supercapacitors have been widely used in the research of green energy storage devices due to their safe operating voltage and excellent electrochemical performance. [0003] However, traditional supercapacitors often have disadvantages such as low energy density, poor cycle stability, and low rate performance, which have caused resistance and ob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86H01G11/24H01G11/30H01G11/46H01M4/36H01M4/52H01M4/58B82Y30/00
CPCB82Y30/00H01G11/24H01G11/30H01G11/46H01G11/86H01M4/366H01M4/52H01M4/5815Y02E60/10
Inventor 王秀华石波张晨
Owner ANHUI NORMAL UNIV
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