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MNO2/CEO2 composite electrode with porous structure and its preparation method and application

A technology of porous structure and composite electrode, which is applied in the direction of fuel cell half-cells and secondary battery-type half-cells, structural parts, battery electrodes, etc., can solve the problems of no literature reports, etc., to promote low-dimensional growth, Low energy consumption and reduced polarization effect

Inactive Publication Date: 2018-12-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The above-mentioned electrode design scheme has important theoretical significance and practical application value for solving the problems of lithium-air batteries, but there is no literature report in this regard

Method used

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  • MNO2/CEO2 composite electrode with porous structure and its preparation method and application
  • MNO2/CEO2 composite electrode with porous structure and its preparation method and application
  • MNO2/CEO2 composite electrode with porous structure and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Immerse Ni in 0.008mol / L KMnO 4 aqueous solution, and add 98% concentrated sulfuric acid (the volume of concentrated sulfuric acid is KMnO 4 3.3×10 volume of deionized water in aqueous solution –4 ), hydrothermal reaction at 85°C for 2.5h, washing, drying, and heat treatment at 300°C for 2 hours under Ar atmosphere to obtain porous δ-MnO supported on foamed nickel 2 (Ni / MnO 2 ), where MnO 2 The loading capacity is 0.547mg / cm 2 ; Cerium nitrate hexahydrate (Ce(NO 3 ) 2 ·6H 2 O) be dissolved in deionized water, stir well, prepare Ce 2+ A solution with a concentration of 0.002mol / L; the Ni / MnO 2 Ce 2+ In the solution, add 0.2mol / L NaHCO dropwise 3 solution until a white flocculent precipitate appears, and after standing for 4 hours, the Ni / MnO with white precipitate 2 Take it out, wash, dry, and heat-treat at 400 °C for 2 hours under Ar atmosphere to obtain porous MnO supported on foamed nickel. 2 / CeO 2 (Ni / MnO 2 / CeO 2 ), CeO 2 The loading capacity is 0.1...

Embodiment 2

[0045] Immerse Ni in 0.008mol / L KMnO 4 aqueous solution, and add 98% concentrated sulfuric acid (the volume of concentrated sulfuric acid is 3.3×10 of the volume of deionized water –4 ), subjected to hydrothermal reaction at 80°C for 3h, then washed, dried, and heat-treated at 300°C for 2 hours under Ar atmosphere to obtain porous δ-MnO supported on foamed nickel 2 (Ni / MnO 2 ), where MnO 2 The loading capacity is 0.532mg / cm 2 ; Cerium nitrate hexahydrate (Ce(NO 3 ) 2 ·6H 2 O) be dissolved in deionized water, stir well, prepare Ce 2+ A solution with a concentration of 0.001mol / L; the Ni / MnO 2 Ce 2+ In the solution, add 0.2mol / L NaHCO dropwise 3 solution until a white flocculent precipitate appears, and after standing for 4 hours, the Ni / MnO with white precipitate 2 Take it out, wash, dry, and heat-treat at 400 °C for 2 hours under Ar atmosphere to obtain porous MnO supported on foamed nickel. 2 / CeO 2 (Ni / MnO 2 / CeO 2 ), CeO 2 The loading capacity is 0.077mg / cm ...

Embodiment 3

[0049] Immerse Ni in 0.008mol / L KMnO 4 aqueous solution, and add 98% concentrated sulfuric acid (the volume of concentrated sulfuric acid is 3.3×10 of the volume of deionized water –4 ), subjected to hydrothermal reaction at 90°C for 2h, then washed, dried, and heat-treated at 300°C for 2h under Ar atmosphere to obtain porous δ-MnO loaded on foamed nickel 2 (Ni / MnO 2 ), where MnO 2 The loading capacity is 0.551mg / cm 2 ; Cerium nitrate hexahydrate (Ce(NO 3 ) 2 ·6H 2 O) be dissolved in deionized water, stir well, prepare Ce 2+ A solution with a concentration of 0.003mol / L; the Ni / MnO 2 Ce 2+ In the solution, add 0.2mol / L NaHCO dropwise 3 solution until a white flocculent precipitate appears, and after standing for 4 hours, the Ni / MnO with white precipitate 2 Take it out, wash, dry, and heat-treat at 400 °C for 2 hours under Ar atmosphere to obtain porous MnO supported on foamed nickel. 2 / CeO 2 (Ni / MnO 2 / CeO 2 ), CeO 2 The loading capacity is 0.212mg / cm 2 . X-...

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Abstract

The invention discloses a MnO2 / CeO2 electrode with a porous structure. The three-dimensional porous nickel foam is used as a matrix, and porous MnO2 is directly grown on the matrix, and CeO2 nanoparticles are directly grown on the MnO2. The invention also discloses the preparation method and application of the porous structure MnO2 / CeO2 electrode. The preparation process is simple, the cost is low, the cycle is short, and the energy consumption is low. It is suitable for large-scale industrial production. The prepared composite electrode with porous structure does not contain binders. Due to the special three-dimensional porous structure of nickel foam and the MnO2 / CeO2 and its synergistic catalytic mechanism, Li-air batteries show lower polarization and better cycling stability when the electrode is used as a catalytic cathode.

Description

technical field [0001] The invention relates to the field of catalytic electrodes for lithium-air batteries, in particular to a MnO with a porous structure 2 / CeO 2 Composite electrode and its preparation method and application. Background technique [0002] Lithium-ion batteries are now widely used in mobile electronic devices, such as smartphones, laptops, etc., and have huge markets in grid energy storage, electric vehicles. However, the low energy density of lithium-ion batteries limits their application in the field of large-scale energy storage, such as large-scale use in electric vehicles. In contrast, the energy density of lithium-air batteries is higher than that of traditional lithium-ion batteries, but it has attractive application prospects in the field of large-scale energy storage, especially in electric vehicles. [0003] Different from the (Li-ion) shuttle mechanism of conventional Li-ion batteries, Li-air batteries work based on lithium peroxide (Li 2 o ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1391H01M4/131H01M12/08
CPCH01M4/131H01M4/1391H01M12/08Y02E60/10
Inventor 赵新兵曹灿屠芳芳谢健曹高劭
Owner ZHEJIANG UNIV