Three-dimensional graphene-based combined electrode with MnO2 and Au nanoparticle-coating surface, and preparation method and applications thereof

A graphene-based, nano-particle technology, applied in the field of composite electrodes for lithium-air batteries, can solve the problems of no three-dimensional graphene-based composite electrode materials, etc., to achieve improved electrochemical performance, high cycle stability, and reduced overpotential Effect

Active Publication Date: 2014-06-04
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In the prior art, there are many reports on the preparation of composite materials using graphene as a matrix material, but there are few reports on catalyst supports for lithium-air batteries. For example, the Chinese patent application with publication number CN102423703A discloses a lithium-air A graphene-platinum nanocomposite catalyst for an empty battery and a preparation method...

Method used

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  • Three-dimensional graphene-based combined electrode with MnO2 and Au nanoparticle-coating surface, and preparation method and applications thereof
  • Three-dimensional graphene-based combined electrode with MnO2 and Au nanoparticle-coating surface, and preparation method and applications thereof
  • Three-dimensional graphene-based combined electrode with MnO2 and Au nanoparticle-coating surface, and preparation method and applications thereof

Examples

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Embodiment 1

[0040] Put nickel foam into a tube furnace, and raise the temperature to 1000°C at a rate of 100°C / min under an Ar (500s.c.c.m.) atmosphere; after holding for 5 minutes, introduce ethanol into the quartz tube with an Ar (250s.c.c.m.) airflow , reacted for 5 minutes; finally, cooled to room temperature at a cooling rate of 100°C / min in an Ar atmosphere to obtain three-dimensional graphene (Ni / 3D-G) grown on a nickel foam substrate, in which the loading capacity of graphene was 0.85m g / cm 2 ; the KMnO 4 and 96wt%H 2 SO 4 (molar KMnO 4 0.25) dissolved in deionized water, stirred evenly, prepared with K + A solution with a concentration of 0.01mol / L. Use Ni / 3D-G as the matrix, immerse in the above solution, and then transfer it into the reaction kettle, seal it and keep it in an oven at 85°C for 2 hours, then rinse it with deionized water and absolute alcohol several times, and put it in an oven at 60°C Manganese hydroxide loaded on Ni / 3D-G was obtained after vacuum drying ...

Embodiment 2

[0053]Put nickel foam into a tube furnace, and raise the temperature to 1000°C at a rate of 100°C / min under an Ar (500s.c.c.m.) atmosphere; after holding for 5 minutes, introduce ethanol into the quartz tube with an Ar (250s.c.c.m.) airflow , reacted for 3 minutes; finally, cooled to room temperature at a cooling rate of 100°C / min in an Ar atmosphere to obtain three-dimensional graphene (Ni / 3D-G) grown on a nickel foam substrate, in which the loading capacity of graphene was 0.5mg / cm 2 ; the KMnO 4 and 96wt%H 2 SO 4 (molar KMnO 4 0.3) was dissolved in deionized water, stirred well, prepared in K + A solution with a concentration of 0.02mol / L. Use Ni / 3D-G as the matrix, immerse in the above solution, and then transfer it into the reaction kettle. After sealing it, keep it in an oven at 100°C for 1 hour, then rinse it with deionized water and absolute alcohol several times, and put it in an oven at 60°C. After vacuum drying for 12 hours, Ni / 3D-G loaded with manganese hydr...

Embodiment 3

[0058] Put nickel foam into a tube furnace, and raise the temperature to 1000°C at a rate of 100°C / min under an Ar (500s.c.c.m.) atmosphere; after holding for 5 minutes, introduce ethanol into the quartz tube with an Ar (250s.c.c.m.) airflow , reacted for 10 minutes; finally, cooled to room temperature at a cooling rate of 100°C / min under Ar atmosphere to obtain three-dimensional graphene (Ni / 3D-G) grown on a nickel foam substrate, in which the loading capacity of graphene was 1.5mg / cm 2 ; the KMnO 4 and 96wt%H 2 SO 4 (molar KMnO 4 0.5) was dissolved in deionized water, stirred evenly, prepared in K + A solution with a concentration of 0.01mol / L. Use Ni / 3D-G as the matrix, immerse in the above solution, and then transfer it into the reaction kettle, seal it and keep it in an oven at 80°C for 3 hours, then rinse it with deionized water and absolute alcohol several times, and put it in an oven at 60°C Manganese hydroxide loaded on Ni / 3D-G was obtained after vacuum drying ...

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Abstract

The invention discloses a three-dimensional graphene-based combined electrode with a MnO2 and Au nanoparticle-coating surface. By taking three-dimensional porous foam nickel as a matrix, graphene directly grows on the matrix, and flower-shaped delta-MnO2 directly grows on the graphene and loaded with Au nanoparticles. The invention further discloses a preparation method and applications of the three-dimensional graphene-based combined electrode with the MnO2 and Au nanoparticle-coating surface. The preparation method has the advantages of being simple in preparation technology, low in cost, short in period, low in energy consumption and the like, and is suitable for industrial mass production; the prepared three-dimensional graphene-based combined electrode does not contain any conductive agent and binder, and due to the synergistic catalytic action of a special three-dimensional porous structure and the flower-shaped delta-MnO2, Au nanoparticles and graphene, the three-dimensional graphene-based combined electrode shows low polarization and better cycling stability when being used as a lithium-air battery cathode.

Description

technical field [0001] The invention relates to the field of composite electrodes for lithium-air batteries, in particular to a surface-coated MnO 2 Three-dimensional graphene-based composite electrode with Au nanoparticles, preparation method and application. Background technique [0002] Lithium-air battery is a new type of energy storage device that uses metal lithium as the negative electrode, air (or oxygen) as the positive electrode, and a lithium ion conductor as the electrolyte. The theoretical energy density of lithium-air batteries is as high as 11680Wh / kg (excluding O 2 , if including O 2 , then 5200Wh / kg). Considering the weight of catalyst, electrolyte, battery packaging, etc., the actual available energy density of lithium-air batteries is about 1700Wh / kg, which is comparable to the energy density of gasoline and much higher than that of nickel-hydrogen (50Wh / kg), Energy density of lithium-ion (160Wh / kg), lithium-sulfur (370Wh / kg), zinc-air (350Wh / kg) batte...

Claims

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Application Information

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IPC IPC(8): H01M4/96H01M4/88H01M12/08
CPCY02E60/50H01M4/8605H01M4/8825H01M4/9016H01M4/9041H01M4/9083H01M4/96H01M12/08H01M2004/8689Y02E60/10
Inventor 谢健刘双宇曹高劭赵新兵
Owner ZHEJIANG UNIV
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